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ROSAT Survey Diffuse X‐Ray Background Maps. II.
Open accessAbstract
This paper presents new maps of the soft X-ray background from the ROSAT all-sky survey. These maps represent a significant improvement over the previous version in that (1) the position resolution of the PSPC has been used to improve the angular resolution from ~2° to 12', (2) there are six energy bands that divide each of the previous three into two parts, and (3) the contributions of point sources have been removed to a uniform source flux level over most of the sky. These new maps will be available in electronic format later in 1997. In this paper we also consider the bright emission in the general direction of the Galactic center in the 0.5-2.0 keV band, and the apparent absorption trough that runs through it along the Galactic plane. We find that while the northern hemisphere data are confused by emission from Loop I, the emission seen south of the plane is consistent with a bulge of hot gas surrounding the Galactic center (in our simple model, a cylinder with an exponential fall-off of density with height above the plane). The cylinder has a radial extent of ~5.6 kpc. The X-ray emitting gas has a scale height of 1.9 kpc, an in-plane electron density of ~0.0035 cm -3 , a temperature of ~10 6.6 K, a thermal pressure of ~28,000 cm -3 K, and a total luminosity of ~2 × 10 39 ergs s -1 using a collisional ionization equilibrium (CIE) plasma emission model.
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“In the past two decades, it has become increasingly clear that the Milky Way is such a system with a large-scale ( ≳ kpc) outflow where we can possibly have a multi-wavelength observation of the feedback process.”
From The Fermi/eROSITA bubbles: a look into the nuclear outflow from the Milky Way (2024) · cites this paper as Snowden et al. 1997
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Self-citationFirst Maps of the Soft X-Ray Diffuse Background from the ROSAT XRT/PSPC All-Sky Survey
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Bland-Hawthorn, J., & Gerhard, O. (2016) · Annual Review of Astronomy and Astrophysics · doi:10.1146/annurev-astro-081915-023441 · Cited by 1,656
“…in absorption, and in high-resolution X-ray spectra (Paerels & Kahn 2003) of a nearly ubiquitous soft X-ray background with energies in the range of 0.1–1.0 keV (implying temperatures of ∼106−7 K), with some contribution of OVII and OVIII in emission (Snowden et al. 1997, Henley & Shelton 2012).”
BackgroundInfluentialGIANT GAMMA-RAY BUBBLES FROM FERMI-LAT: ACTIVE GALACTIC NUCLEUS ACTIVITY OR BIPOLAR GALACTIC WIND?
Su, M., Slatyer, T., & Finkbeiner, D. (2010) · The Astrophysical Journal · doi:10.1088/0004-637x/724/2/1044 · Cited by 756
“…data up to ∼ 100GeV, with sufficient angular resolution to map out interesting structures.4 At lower energies, the ROSAT All-Sky Survey at 1.5 keV (Snowden et al. 1997) revealed a biconical X-ray structure over the inner tens of degrees around the Galactic center (GC), later interpreted as a…”
BackgroundInfluentialCHANDRASTUDIES OF THE X-RAY GAS PROPERTIES OF GALAXY GROUPS
Sun, M., Voit, G. M., Donahue, M. E., Jones, C. J., Forman, W., & Vikhlinin, A. A. (2009) · The Astrophysical Journal · doi:10.1088/0004-637x/693/2/1142 · Cited by 599
Highly Ionized High‐Velocity Gas in the Vicinity of the Galaxy
Sembach, K. R., Wakker, B. P., Savage, B. D., Richter, P., Meade, M., Shull, J. M., Jenkins, E. B., Sonneborn, G., & Moos, H. W. (2003) · The Astrophysical Journal Supplement Series · doi:10.1086/346231 · Cited by 479
“The soft X-ray data points are from the ROSAT all-sky survey (Snowden et al. 1997) and are R1+R2 band averages of the eight 120 pixels ( 1150 arcmin2 total) surrounding each sight line, ignoring the pixel directly along the sight line to avoid the X-ray emission from the background AGN or QSO being…”
MethodMultiphase galaxy formation: high-velocity clouds and the missing baryon problem
Maller, A. H., & Bullock, J. S. (2004) · Monthly Notices of the Royal Astronomical Society · doi:10.1111/j.1365-2966.2004.08349.x · Cited by 468
The Three-Phase Interstellar Medium Revisited
Cox, D. P. (2005) · Annual Review of Astronomy and Astrophysics · doi:10.1146/annurev.astro.43.072103.150615 · Cited by 417
“From Snowden et al. (1997), the conversion from EM to ROSAT surface brightness units in this range is 7000 T6.”
BackgroundInfluentialSunyaev, R., Arefiev, V., Babyshkin, V., Bogomolov, A., Borisov, K., Buntov, M., Brunner, H., Burenin, R., Churazov, E., Coutinho, D., et al. (2021) · Astronomy and Astrophysics · doi:10.1051/0004-6361/202141179 · Cited by 390
Self-citationA catalog of galaxy clusters observed by XMM-Newton
Snowden, S. L., Mushotzky, R. F., Kuntz, K. D., & Davis, D. S. (2007) · Astronomy and Astrophysics · doi:10.1051/0004-6361:20077930 · Cited by 383
“7 displays the ROSAT All-Sky Survey (RASS) sky maps in the 14 keV, 3 4 keV, and 1.5 keV band from Snowden et al. (1997).”
BackgroundInfluentialSelf-citationA High Spectral Resolution Observation of the Soft X‐Ray Diffuse Background with Thermal Detectors
McCammon, D., Almy, R., Apodaca, E., Tiest, W. M. B., Cui, W., Deiker, S. W., Galeazzi, M., Juda, M., Lesser, A., Mihara, T., et al. (2002) · The Astrophysical Journal · doi:10.1086/341727 · Cited by 376
Self-citationThe Search for the Missing Baryons at Low Redshift
Bregman, J. N. (2007) · Annual Review of Astronomy and Astrophysics · doi:10.1146/annurev.astro.45.051806.110619 · Cited by 346
“The first one varies in time and can produce dramatic background flares while the second varies around the Galaxy, and while that is roughly known (Snowden et al., 1997), it is not known with precision on the scale of Chandra or XMM fields.”
BackgroundPhysical Processes in the Interstellar Medium
Klessen, R., & Glover, S. (2014) · Saas-Fee Advanced Course · doi:10.1007/978-3-662-47890-5_2 · Cited by 264
“The estimate for the Galactic synchrotron emission is taken from Draine (2011) and the one for the X-ray flux from Snowden et al. (1997).”
BackgroundDetection of a non-Gaussian spot in WMAP
Cruz, M., Martínez-González, E., Vielva, P., & Cayón, L. (2004) · Monthly Notices of the Royal Astronomical Society · doi:10.1111/j.1365-2966.2004.08419.x · Cited by 338
Reproducibility of Non-X-Ray Background for the X-Ray Imaging Spectrometer aboard Suzaku
Tawa, N., Hayashida, K., Nagai, M., Nakamoto, H., Tsunemi, H., Yamaguchi, H., Ishisaki, Y., Miller, E. D., Mizuno, T., Dotani, T., et al. (2008) · Publications of the Astronomical Society of Japan · doi:10.1093/pasj/60.sp1.s11 · Cited by 332
“Snowden et al. (1997) proposed a model which provides their spectra based on the ROSAT all sky survey.”
BackgroundTHE SPECTRUM AND MORPHOLOGY OF THE FERMI BUBBLES
Ackermann, M., Albert, A., Atwood, W. B., Baldini, L., Ballet, J., Barbiellini, G., Bastieri, D., Bellazzini, R., Bissaldi, E., Blandford, R. D., et al. (2014) · The Astrophysical Journal · doi:10.1088/0004-637x/793/1/64 · Cited by 328
“0.01 cm−3 at a few kpc from the Galactic plane (Snowden et al. 1997), and can be neglected.”
BackgroundInfluentialThe Large‐Scale Bipolar Wind in the Galactic Center
Bland‐Hawthorn, J., & Cohen, M. (2003) · The Astrophysical Journal · doi:10.1086/344573 · Cited by 301
“Introduction The NPS extends 80 in Galactic latitude perpendicular to the plane and is the largest projected structure seen at X-ray and radio wavelengths (Berkhuijsen 1972; Haslam et al. 1974; Snowden et al. 1997; Sofue 2000).”
BackgroundThe Milky Way’s Kiloparsec‐Scale Wind: A Hybrid Cosmic‐Ray and Thermally Driven Outflow
Everett, J. E., Zweibel, E. G., Benjamin, R. A., McCammon, D., Rocks, L., & Gallagher, J. S. (2008) · The Astrophysical Journal · doi:10.1086/524766 · Cited by 288
Self-citationMaughan, B. J., Jones, C. J., Forman, W., & Speybroeck, L. V. (2008) · The Astrophysical Journal Supplement Series · doi:10.1086/521225 · Cited by 285
“This was tested by correlating the cluster fluxes and background scaling factors with the 0.75 keV X-ray background flux measured in the ROSAT all-sky survey (Snowden et al. 1997) in an annulus of 0.5 deg−1 deg centered on each cluster.”
MethodInfluentialSnowden, S. L., Egger, R., Finkbeiner, D. P., Freyberg, M. J., & Plucinsky, P. P. (1998) · The Astrophysical Journal · doi:10.1086/305135 · Cited by 276
Self-citationXMM‐Newton Observation of Solar Wind Charge Exchange Emission
Snowden, S. L., Collier, M. R., & Kuntz, K. D. (2004) · The Astrophysical Journal · doi:10.1086/421841 · Cited by 273
Self-citationPierre, M., Pacaud, F., Adami, C., Aliş, S., Altieri, B., Baran, N., Benoist, C., Birkinshaw, M., Bongiorno, A., Bremer, M., et al. (2015) · Astronomy and Astrophysics · doi:10.1051/0004-6361/201526766 · Cited by 271
“By design, both of these directions have low Galactic column densities providing excellent views of the Galactic bulge and halo (Snowden et al. 1997).”
Self-citationDeconstructing the Spectrum of the Soft X‐Ray Background
Kuntz, K. D., & Snowden, S. L. (2000) · The Astrophysical Journal · doi:10.1086/317071 · Cited by 268
Self-citationStudy of the X-Ray Background Spectrum and Its Large-Scale Fluctuation with ASCA
Kushino, A., Ishisaki, Y., Morita, U., Yamasaki, N. Y., Ishida, M., Ohashi, T., & Ueda, Y. (2002) · Publications of the Astronomical Society of Japan · doi:10.1093/pasj/54.3.327 · Cited by 263
“In the flux range above ∼ 10−14 ergcm−2 s−1, the relation follows the uniform Euclidean relation of dN (> S)/dS ∝ S−2.5, as already indicated from 1 In Snowden et al. (1997), the scale height parameter is used for the gas density, hence we have multiplied their scale height by 0.5.”
MethodResultInfluentialSugizaki, M., Mitsuda, K., Kaneda, H., Matsuzaki, K., Yamauchi, S., & Koyama, K. (2001) · The Astrophysical Journal Supplement Series · doi:10.1086/320358 · Cited by 260
“The most of the ROSAT sources on the Galactic plane are identified with stellar active coronae and the rest are identified with OB stars and CVs (Motch et al. 1997).”
BackgroundInfluentialCONSTRAINING THE MILKY WAY'S HOT GAS HALO WITH O VII AND O VIII EMISSION LINES
Miller, M. J., & Bregman, J. N. (2015) · The Astrophysical Journal · doi:10.1088/0004-637x/800/1/14 · Cited by 273
“The SXRB, with some contribution from O VII and O VIII emission lines, has been observed in broadband images from the ROSAT All-Sky Survey (RASS; Snowden et al. 1997), in blank-sky spectra from current X-ray telescopes (Yoshino et al. 2009; Henley & Shelton 2010, 2012), and with the Diffuse X-ray…”
BackgroundMethodResultInfluentialFermi Bubbles: Giant, Multibillion-Year-Old Reservoirs of Galactic Center Cosmic Rays
Crocker, R. M., & Aharonian, F. (2011) · Physical Review Letters · doi:10.1103/physrevlett.106.101102 · Cited by 242
THE STRUCTURE OF THE MILKY WAY'S HOT GAS HALO
Miller, M., & Bregman, J. (2013) · The Astrophysical Journal · doi:10.1088/0004-637x/770/2/118 · Cited by 155
“One constraint we must address is the X-ray emission measure toward the Galactic center determined by Snowden et al. (1997) using the ROSAT all-sky survey.”
BackgroundMethodRadial temperature profiles for a large sample of galaxy clusters observed withXMM-Newton
Leccardi, A., & Molendi, S. (2008) · Astronomy and Astrophysics · doi:10.1051/0004-6361:200809538 · Cited by 227
“The local background should have a variation length scale of some degrees (Snowden et al. 1997); conversely,NCXB may have large (i.e. 20-100”
BackgroundSpatial distribution of interstellar gas in the innermost 3 kpc of our galaxy
Ferrière, K., Gillard, W., & Jean, P. (2007) · Astronomy and Astrophysics · doi:10.1051/0004-6361:20066992 · Cited by 227
“Although part of the enhancement can be attributed to the nearby Loop I SB, Snowden et al. (1997) argued, based on the latitude profile of the excess emission, on the absorption trough running along the 7 In the rest of this section, all density estimates deduced from emission measures implicitly assume that the phase…”
BackgroundInfluentialPratt, G. W., & Arnaud, M. (2002) · Astronomy and Astrophysics · doi:10.1051/0004-6361:20021032 · Cited by 203
“However, the blank-sky data set does not necessarily represent the cosmic X-ray background (CXB), because this is variable across the sky, especially the soft X–ray component (see Snowden et al. 1997).”
BackgroundDistribution and Kinematics of O vi in the Galactic Halo
Savage, B. D., Sembach, K. R., Wakker, B. P., Richter, P., Meade, M. R., Jenkins, E. B., Shull, J. M., Moos, H. W., & Sonneborn, G. (2003) · The Astrophysical Journal Supplement Series · doi:10.1086/346229 · Cited by 202
“In Figure 19c we directly compare values of log N(O vi) with values of the 0.25 keV X-ray count rate from the ROSAT survey, log I(X).”
BackgroundMethodInfluentialSpatial distribution of interstellar gas in the innermost 3 kpc of our Galaxy
Ferrière, K., Gillard, W., & Jean, P. (2007) · Springer Link (Chiba Institute of Technology) · doi:10.1051/0004-6361:20066992/pdf · Cited by 199
ChandraTemperature Maps for Galaxy Clusters with Radio Halos
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THE GAMMA-RAY AND NEUTRINO SKY: A CONSISTENT PICTURE OF FERMI -LAT, MILAGRO, AND ICECUBE RESULTS
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“For the Chandra clusters, complementary to the S17 process, the ROSAT All-Sky survey maps in seven bands (Snowden et al. 1997) were used to better constrain the X-ray background components.”
MethodNew 3D gas density maps of NaI and CaII interstellar absorption within 300 pc
Welsh, B. Y., Lallement, R., Vergely, J.-L., & Raimond, S. (2009) · Astronomy and Astrophysics · doi:10.1051/0004-6361/200913202 · Cited by 185
“We note that in the direction of this newly discovered gap in theLC wall there is a large patch of emission revealed in both the 3/4 keV and 1/4 keV maps of the SXRB (Snowden et al 1997).”
BackgroundHooper, D., Finkbeiner, D. P., & Dobler, G. (2007) · Physical review. D. Particles, fields, gravitation, and cosmology/Physical review. D. Particles and fields · doi:10.1103/physrevd.76.083012 · Cited by 207
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“For the ROSAT map used in the present analysis, point sources with count- ing rate > 0.020 c s−1 in the R45 band were removed (Snowden et al. 1997).”
MethodInfluentialSelf-citationChandraX‐Ray Observations of the X‐Ray Faint Elliptical Galaxy NGC 4697
Sarazin, C. L., Irwin, J. A., & Bregman, J. N. (2001) · The Astrophysical Journal · doi:10.1086/321618 · Cited by 179
Reproducibility of Non-X-Ray Background for the X-Ray Imaging Spectrometer aboard Suzaku
Tawa, N., Hayashida, K., Nagai, M., Nakamoto, H., Tsunemi, H., Yamaguchi, H., Ishisaki, Y., Miller, E. D., Mizuno, T., Dotani, T., et al. (2007) · JAXA Repository (JAXA) · Cited by 172
ChandraSpectra of the Soft X‐Ray Diffuse Background
Markevitch, M. L., Bautz, M. W., Biller, B. A., Butt, Y., Edgar, R., Gaetz, T. J., GARMIRE, G. P., Grant, C. E., Green, P. J., Juda, M., et al. (2003) · The Astrophysical Journal · doi:10.1086/345347 · Cited by 164
“One can, for example, compare the RASS R4-R5 flux (Snowden et al. 1997) for a given observation to the average R4-R5 flux for the background dataset to determine if a correction is needed (for low-b fields, it may be needed even if those wide-band fluxes are similar, since the soft spectra may…”
BackgroundMethodSelf-citationKraft, R., Vázquez, S. E., Forman, W., Jones, C. J., Murray, S. S., Hardcastle, M. J., Worrall, D. M., & Churazov, E. (2003) · The Astrophysical Journal · doi:10.1086/375533 · Cited by 164
“First, they are generated from several high Galactic latitude observations, and Cen A is located in the North Polar Spur (NPS) (l ¼ 309=52, b ¼ 19=42).”
BackgroundPlanckearly results. IX.XMM-Newtonfollow-up for validation ofPlanckcluster candidates
Aghanim, N., Arnaud, M., Ashdown, M., Aumont, J., Baccigalupi, C., Balbi, A., Banday, A. J., Barreiro, R. B., Bartelmann, M., Bartlett, J. G., et al. (2011) · Astronomy and Astrophysics · doi:10.1051/0004-6361/201116460 · Cited by 163
Measuring cluster temperature profiles with XMM/EPIC
Arnaud, M., Neumann, D. M., Aghanim, N., Gastaud, R., Majerowicz, S., & Hughes, J. P. (2001) · Astronomy and Astrophysics · doi:10.1051/0004-6361:20000017 · Cited by 163
Mao, S. A., Gaensler, B. M., Haverkorn, M., Zweibel, E. G., Madsen, G. J., McClure‐Griffiths, N. M., Shukurov, A., & Kronberg, P. P. (2010) · The Astrophysical Journal · doi:10.1088/0004-637x/714/2/1170 · Cited by 162
“…the following maps: the HI neutral hydrogen map (Kalberla et al. 2005); the dust map (Schlegel et al. 1998); the ROSAT all sky survey Xray map (Snowden et al. 1997); the 408 MHz total synchrotron intensity map (Haslam et al. 1982); the 1.4 GHz polarized synchrotron emission map (north:…”
BackgroundInfluentialYuan, W., Zhang, C., Chen, Y., & Ling, Z. (2022) · Springer eBooks · doi:10.1007/978-981-16-4544-0_151-1 · Cited by 160
Romer, A. K., Viana, P. T. P., Liddle, A. R., & Mann, R. G. (2001) · The Astrophysical Journal · doi:10.1086/318382 · Cited by 160
“…and extragalactic components) is known to vary considerably across the sky, but most of this variation is confined to low energies (< 1 keV, Snowden et al. 1997), and so this should not have a significant effect on the average signal–to–noise values for cluster detections we calculate in…”
BackgroundX-rays from solar system objects
Bhardwaj, A., Elsner, R. F., Gladstone, G. R., Cravens, T. E., Lisse, C. M., Dennerl, K., Branduardi-Raymont, G., Wargelin, B. J., Waite, J. H., Robertson, I. P., et al. (2007) · Planetary and Space Science · doi:10.1016/j.pss.2006.11.009 · Cited by 152
Self-citationTHE FERMI BUBBLES: SUPERSONIC ACTIVE GALACTIC NUCLEUS JETS WITH ANISOTROPIC COSMIC-RAY DIFFUSION
Yang, H.-Y. K., Ruszkowski, M., Ricker, P. M., Zweibel, E., & Lee, D. (2012) · The Astrophysical Journal · doi:10.1088/0004-637x/761/2/185 · Cited by 147
“However, the general success in reproducing the observed X-ray features provides a strong support for the hypothesis that both the Fermi bubbles and the ROSAT X-ray features originate from the same episode of jet activity from the central SMBH.”
BackgroundInfluentialChandraObservations of the “Dark” Moon and Geocoronal Solar Wind Charge Transfer
Wargelin, B. J., Markevitch, M. L., Juda, M., Kharchenko, V. A., Edgar, R., & Dalgarno, A. (2004) · The Astrophysical Journal · doi:10.1086/383410 · Cited by 143
“The finalROSATAll-Sky Survey (RASS) diffuse background maps (Snowden et al. 1995, 1997) removed the LTEs, so far 1 bwargelin@cfa.harvard.edu 2 Also IKI, Moscow, Russia as possible, by comparing multiple observations of the same part of the sky, but any constant or slowly varying (τ & 1 week)…”
X‐Ray Absorption from the Milky Way Halo and the Local Group
Bregman, J. N., & Lloyd-Davies, E. (2007) · The Astrophysical Journal · doi:10.1086/521321 · Cited by 141
“The 1/4 keV X-ray background is dominated by the gas within a few hundred parsecs of the Sun, plus a flattened hot halo of height 2 kpc (Snowden et al. 1997).”
BackgroundAn X-ray chimney extending hundreds of parsecs above and below the Galactic Centre
Ponti, G., Hofmann, F., Churazov, E., Morris, M. R., Haberl, F., Nandra, K., Terrier, R., Clavel, M., & Goldwurm, A. (2019) · Nature · doi:10.1038/s41586-019-1009-6 · Cited by 139
Abdalla, H., Abramowski, A., Aharonian, F., Benkhali, F. A., Akhperjanian, A. G., Andersson, T., Angüner, E. O., Arrieta, M., Aubert, P., Backes, M., et al. (2017) · Astronomy and Astrophysics · doi:10.1051/0004-6361/201629790 · Cited by 140
“It was discovered in the ROSAT allsky survey (Pfeffermann & Aschenbach 1996) and has an estimated distance of 1 kpc (Fukui et al. 2003).”
BackgroundResultInfluentialSlavin, J. D., & Frisch, P. C. (2008) · Astronomy and Astrophysics · doi:10.1051/0004-6361:20078101 · Cited by 138
“Refinements to this picture have been required by ROSAT data showing absorption by relatively distant clouds (e.g. MBM12, Snowden et al. 1993).”
TheFar Ultraviolet Spectroscopic ExplorerSurvey of O vi Absorption in the Disk of the Milky Way
Bowen, D. V., Jenkins, E. B., Tripp, T. M., Sembach, K. R., Savage, B. D., Moos, H. W., Oegerle, W. R., Friedman, S. D., Gry, C., Kruk, J. W., et al. (2008) · The Astrophysical Journal Supplement Series · doi:10.1086/524773 · Cited by 138
“The precise interpretation of the emissivity at different energies is somewhat complicated, and is discussed in detail by Snowden et al. (1997).”
BackgroundExtrasolar Giant Planets and X‐Ray Activity
Kashyap, V. L., Drake, J. J., & Saar, S. H. (2008) · The Astrophysical Journal · doi:10.1086/591922 · Cited by 134
“4 keV band at the location of the source and the accumulated exposure time (in the all-sky maps from the survey; Snowden et al. 1997).”
BackgroundSuzaku Observations of Abell 1795: Cluster Emission to r200
Bautz, M. W., Miller, E. D., Sanders, J. S., Arnaud, K. A., Mushotzky, R. F., Porter, F. S., Hayashida, K., Henry, J. P., Hughes, J. P., Kawaharada, M., et al. (2009) · Publications of the Astronomical Society of Japan · doi:10.1093/pasj/61.5.1117 · Cited by 130
“We used the X-ray Background Tool3 (Snowden et al. 1997) provided by NASA’s Goddard Space Flight Center to extract the ROSAT spectrum for this region.”
MethodThe Evolution of Structure in X‐Ray Clusters of Galaxies
Jeltema, T. E., CANIZARES, C. R., Bautz, M. W., & Buote, D. A. (2005) · The Astrophysical Journal · doi:10.1086/428940 · Cited by 129
“Another check performedwas a comparison of the soft band flux for the cluster pointings versus the pointings included in the background files using the ROSAT All-SkySurvey (RASS)R4–R5 band data (Snowden et al. 1997).”
MethodThe Cygnus superbubble revisited
Uyanıker, B., Fürst, E., Reich, W., Aschenbach, B., & Wielebinski, R. (2001) · Astronomy and Astrophysics · doi:10.1051/0004-6361:20010387 · Cited by 129
“Another way of obtaining the temperature variations in the PSPC survey maps has been introduced by Snowden et al. (1997).”
BackgroundThe Ionization of Nearby Interstellar Gas
Slavin, J. D., & Frisch, P. C. (2002) · The Astrophysical Journal · doi:10.1086/324495 · Cited by 128
“The diffuse soft X-ray background (SXRB, 0.1–1 keV) is also very important to cloud ioniza- tion, and has been observed over the entire sky by the Wisconsin Group using sounding rockets (McCammon et al. 1983) and with the ROSAT satellite (Snowden et al. 1997).”
InfluentialSofia, U. J., & Jenkins, E. B. (1998) · The Astrophysical Journal · doi:10.1086/305684 · Cited by 127
Gamma-ray sky points to radial gradients in cosmic-ray transport
Gaggero, D., Alfredo Urbano, A., Valli, M., & Ullio, P. (2015) · Physical review. D. Particles, fields, gravitation, and cosmology/Physical review. D. Particles and fields · doi:10.1103/physrevd.91.083012 · Cited by 140
Wild at Heart:-The Particle Astrophysics of the Galactic Centre
Crocker, R., Jones, D., Aharonian, F., Law, C., Melia, F., Oka, T., & Ott, J. (2010) · Monthly Notices of the Royal Astronomical Society · doi:10.1111/j.1365-2966.2010.18170.x · Cited by 107
X-ray observations of the galaxy cluster PKS 0745−191: to the virial radius, and beyond
George, M. R., Fabian, A. C., Sanders, J. S., Young, A. J., & Russell, H. R. (2009) · Monthly Notices of the Royal Astronomical Society · doi:10.1111/j.1365-2966.2009.14547.x · Cited by 122
XMM-NEWTONDETECTS A HOT GASEOUS HALO IN THE FASTEST ROTATING SPIRAL GALAXY UGC 12591
Dai, X., Anderson, M. E., Bregman, J. N., & Miller, J. M. (2012) · The Astrophysical Journal · doi:10.1088/0004-637x/755/2/107 · Cited by 121
“We compared this flux range with the one estimated from the x-ray Background Tool (Snowden et al. 1997) provided by NASA HEASARC using RASS.”
Method[ITAL]Chandra[/ITAL] Temperature Map of A754 and Constraints on Thermal Conduction
Markevitch, M. L., Mazzotta, P., Vikhlinin, A. A., Burke, D. J., Butt, Y., David, L. P., Donnelly, H., Forman, W., Harris, D. E., Kim, D. ‐., et al. (2003) · The Astrophysical Journal · doi:10.1086/374656 · Cited by 121
“From theROSAT AllSky Survey (Snowden et al. 1997), there is no soft Galactic excess at the cluster position, so no additional background modeling was necessary.”
BackgroundCrocker, R. M., Bicknell, G. V., Taylor, A. M., & Carretti, E. (2015) · The Astrophysical Journal · doi:10.1088/0004-637x/808/2/107 · Cited by 120
“The total cooling luminosity, Lcool shell, of the compression shell, R3, should not exceed the upper limit on the bolometric luminosity of the X-ray bulge, which, conservatively, is 1040 erg s−1 (Snowden et al. 1997; Almy et al. 2000).”
BackgroundFermi Gamma-Ray “Bubbles” from Stochastic Acceleration of Electrons
Mertsch, P., & Sarkar, S. (2011) · Physical Review Letters · doi:10.1103/physrevlett.107.091101 · Cited by 119
SUZAKU OBSERVATIONS OF THE DIFFUSE X-RAY EMISSION ACROSS THE FERMI BUBBLES' EDGES
Kataoka, J., Tahara, M., Totani, T., Sofue, Y., Stawarz, Ł., Takahashi, Y., Takeuchi, Y., Tsunemi, H., Kimura, M., Takei, Y., et al. (2013) · The Astrophysical Journal · doi:10.1088/0004-637x/779/1/57 · Cited by 118
“…estimated from the spectral model fits of the Suzaku (or XMM) data (see Table 2), while the minimum and maximum counting rates in the ROSAT map (Snowden et al. 1995, 1997) are given to indicate approximately the fluctuations present in the ROSAT data centered on the same observing region…”
BackgroundMethodMultiple Supernova Remnant Models of the Local Bubble and the Soft X‐Ray Background
Smith, R. K., & Cox, D. P. (2001) · The Astrophysical Journal Supplement Series · doi:10.1086/320850 · Cited by 116
“ÏÏ In particular, toward b CMa (lD 226¡, b D [14¡, d \ 153 ^ 10 pc), the ““ region of bizarre emptiness,ÏÏ very little intervening material has been found over a considerable distance, and yet the SXRB does not appear to be correspondingly bright in that direction (Snowden et al. 1997).”
BackgroundCosmic ray feedback in galaxies and galaxy clusters
Ruszkowski, M., & Pfrommer, C. (2023) · The Astronomy and Astrophysics Review · doi:10.1007/s00159-023-00149-2 · Cited by 71
The Quiescent X‐Ray Spectrum of the Neutron Star in Centaurus X‐4 Observed withChandra/ACIS‐S
Rutledge, R. E., Bildsten, L., Brown, E. F., Pavlov, G. G., & Zavlin, V. E. (2001) · The Astrophysical Journal · doi:10.1086/320247 · Cited by 115
“75 keV; Snowden et al. 1997 ; Fig.”
Fox, A. J., Bordoloi, R., Savage, B. D., Lockman, F. J., Jenkins, E. B., Wakker, B. P., Bland-Hawthorn, J., Hernandez, S., Kim, T.-S., Benjamin, R. A., et al. (2015) · The Astrophysical Journal · doi:10.1088/2041-8205/799/1/l7 · Cited by 126
“…this sightline is the only AGN direction in our sample that passes through the biconical region of enhanced ROSAT 1.5 keV X-ray emission centered on the GC (Snowden et al. 1997), where the γ-ray emission is also strong since the direction intersects the base of the northern FB (Su et al. 2010).”
BackgroundInfluentialSnowden, S. L., Freyberg, M. J., Kuntz, K. D., & Sanders, W. T., III (2000) · The Astrophysical Journal Supplement Series · doi:10.1086/313378 · Cited by 114
Self-citationSIXTE: a generic X-ray instrument simulation toolkit
Dauser, T., Falkner, S., Lorenz, M., Kirsch, C., Peille, P., Cucchetti, E., Schmid, C., Brand, T., Oertel, M., Smith, R. K., et al. (2019) · Astronomy and Astrophysics · doi:10.1051/0004-6361/201935978 · Cited by 112
“…of several different SIMPUT files, including the complete ROSAT All-Sky Survey (RASS; Voges et al. 1999), the extended ROSAT soft X-ray background (Snowden et al. 1997), 589 variable bright sources from the RXTE-ASM, including their light curves, the Galactic ridge emission from unresolved…”
BackgroundKaastra, J. S., Lieu, R., Tamura, T., Paerels, F. B. S., & den Herder, J.-W. (2002) · Astronomy and Astrophysics · doi:10.1051/0004-6361:20021514 · Cited by 109
“The latter may be rebutted by noting that (a) when the ROSAT PSPC data of many clusters were analyzed or re-analyzed using the correct absorption code by the authors mentioned in the previous paragraph, a soft X-ray excess was discovered; (b) also pointed out earlier isthe radially rising importance of the soft compon…”
MethodInfluentialEntropy scaling in galaxy clusters: Insights from anXMM-Newtonobservation of the poor cluster A1983
Pratt, G. W., & Arnaud, M. (2003) · Astronomy and Astrophysics · doi:10.1051/0004-6361:20030844 · Cited by 108
“…et al. (2002), while the blanksky observations provide an adequate description of the hard X-ray and instrumental components of the XMM-Newton background, they do not necessarily represent the soft X-ray component of the background, because this is variable across the sky (see Snowden et al. 1997).”
BackgroundXMM-Newton discovery of an X-ray filament in Coma
Finoguenov, A., Briel, U. G., & Henry, J. P. (2003) · Astronomy and Astrophysics · doi:10.1051/0004-6361:20031319 · Cited by 107
“We first compare the fluxes implied by our analysis to those in the RASS data as presented in Snowden et al. (1997).”
InfluentialThe Galactic Halo Contribution to the Dispersion Measure of Extragalactic Fast Radio Bursts
Yamasaki, S., & Totani, T. (2020) · The Astrophysical Journal · doi:10.3847/1538-4357/ab58c4 · Cited by 104
Sofue, Y. (2000) · The Astrophysical Journal · doi:10.1086/309297 · Cited by 102
“Snowden et al. (1997) have further noticed cylindrical features in the R45 and R67 (1.5 keV) band maps, which emerge from the central Galactic disk toward the halo.”
BackgroundMethodInfluentialPlanck 2015 results - XXV. Diffuse low-frequency Galactic foregrounds
Ade, P. A. R., Aghanim, N., Alves, M. I. R., Arnaud, M., Ashdown, M., Aumont, J., Baccigalupi, C., Banday, A. J., Barreiro, R. B., Bartlett, J. G., et al. (2015) · Research at the University of Copenhagen (University of Copenhagen) · doi:10.1051/0004-6361/201526803 · Cited by 103
Davies, J., Crain, R. A., McCarthy, I. G., Oppenheimer, B. D., Schaye, J., Schaller, M., & McAlpine, S. (2019) · Monthly Notices of the Royal Astronomical Society · doi:10.1093/mnras/stz635 · Cited by 105
X‐Ray Absorption Line Spectroscopy of the Galactic Hot Interstellar Medium
Yao, Y., & Wang, Q. D. (2005) · The Astrophysical Journal · doi:10.1086/429537 · Cited by 101
“Indeed, it has been studied extensively with broadband X-ray observations, producing all-sky maps of the diffuse soft X-ray background (SXB; e.g., Snowden et al. 1997).”
BackgroundInterstellar Dust in the Solar System
Mann, I. B. (2010) · Annual Review of Astronomy and Astrophysics · doi:10.1146/annurev-astro-081309-130846 · Cited by 101
Suzaku Observations of Abell 1795: Cluster Emission to R_200Preprint
Bautz, M. W., Miller, E. D., Sanders, J. S., Arnaud, K. A., Mushotzky, R. F., Porter, F. S., Hayashida, K., Henry, J. P., Hughes, J. P., Kawaharada, M., et al. (2009) · doi:10.48550/arxiv.0906.3515 · Cited by 99
“We used the X-ray Background Tool3 (Snowden et al. 1997) provided by NASA’s Goddard Space Flight Center to extract the ROSAT spectrum for this region.”
MethodWerner, N., McNamara, B. R., Churazov, E., & Scannapieco, E. S. (2018) · Space Science Reviews · doi:10.1007/s11214-018-0571-9 · Cited by 98
FERMI BUBBLES INFLATED BY WINDS LAUNCHED FROM THE HOT ACCRETION FLOW IN SGR A*
Mou, G., Yuan, F., Bu, D., Sun, M., & Su, M. (2014) · The Astrophysical Journal · doi:10.1088/0004-637x/790/2/109 · Cited by 97
“This structure explains the observations obtained in ROSAT X-ray survey (Snowden et al. 1997; Wang 2002).”
ResultModelling the Galactic distribution of free electrons
Schnitzeler, D. H. F. M. (2012) · Monthly Notices of the Royal Astronomical Society · doi:10.1111/j.1365-2966.2012.21869.x · Cited by 97
“Snowden et al. (1997) showed by analysing ROSAT X-ray data that the mid-plane density of free electrons in the Hot inter-cloud medium (HIM) is 3.5 × 10−4 cm−3, which is an order of magnitude smaller than the mid-plane density of the free electrons in the Warm ionized medium (WIM).”
InfluentialSibeck, D. G., Allen, R. C., Aryan, H., Bodewits, D., Brandt, P. C., Branduardi-Raymont, G., Brown, G. V., Carter, J. A., Collado‐Vega, Y. M., Collier, M. R., et al. (2018) · Space Science Reviews · doi:10.1007/s11214-018-0504-7 · Cited by 96
Self-citationThe CMB cold spot: texture, cluster or void?
Cruz, M., Martínez-González, E., Vielva, P., Diego, J. M., Hobson, M., & Turok, N. (2008) · Monthly Notices of the Royal Astronomical Society · doi:10.1111/j.1365-2966.2008.13812.x · Cited by 94
“We can use the ROSAT all-sky survey (Snowden et al. 1997) to estimate the prior on yo.”
MethodZubovas, K., & Nayakshin, S. (2012) · Monthly Notices of the Royal Astronomical Society · doi:10.1111/j.1365-2966.2012.21250.x · Cited by 91
“The limbs of the lobes coincide with the extended structure seen in medium-energy X-rays by ROSAT (Snowden et al. 1997).”
BackgroundWang, Q. D., Yao, Y., Tripp, T. M., Fang, T. ‐., Cui, W., Nicastro, F., Mathur, S., Williams, R. J., Song, L., & Croft, R. (2005) · The Astrophysical Journal · doi:10.1086/497584 · Cited by 93
The stripping of a galaxy group diving into the massive cluster A2142
Eckert, D., Molendi, S., Owers, M. S., Gaspari, M., Venturi, T., Rudnick, L., Ettori, S., Paltani, S., Gastaldello, F., & Rossetti, M. (2014) · Astronomy and Astrophysics · doi:10.1051/0004-6361/201424259 · Cited by 92
“We complemented these data with the ROSAT all-sky survey spectrum of the same region (Snowden et al. 1997), and fitted the XMM-Newton and ROSAT data jointly.”
MethodSlavin, J. D., & Frisch, P. C. (2008) · Springer Link (Chiba Institute of Technology) · doi:10.1051/0004-6361:20078101/pdf · Cited by 93
The Ionization of Nearby Interstellar Gas
Slavin, J. D., & Frisch, P. C. (2001) · CERN Document Server (European Organization for Nuclear Research) · Cited by 93
Where Are the High-Velocity Clouds?
Quilis, V., & Moore, B. (2001) · The Astrophysical Journal · doi:10.1086/322866 · Cited by 91
“Constraints come from the measured soft X-ray background (Snowden et al. 1997, Benson et al. 2000), from the dispersion measures of pulsars in globular clusters and in the Magellanic Clouds, from the kinematics (Moore & Davis 1994) or lifetime (Murali 2000) of the Magellanic Stream.”
BackgroundSTRUCTURE IN THE ROTATION MEASURE SKY
Stil, J. M., Taylor, A. R., & Sunstrum, C. (2010) · The Astrophysical Journal · doi:10.1088/0004-637x/726/1/4 · Cited by 91
“At high latitudes, emission from the more distant halo is observed, while high-latitude clouds absorb the halo emission locally, and appear as dark silhouettes known as X-ray shadows (Snowden et al. 1997, 1998).”
BackgroundInfluentialPointecouteau, É., Arnaud, M., Kaastra, J. S., & de Plaa, J. (2004) · Astronomy and Astrophysics · doi:10.1051/0004-6361:20035856 · Cited by 91
Bordoloi, R., Fox, A. J., Lockman, F. J., Wakker, B. P., Jenkins, E. B., Savage, B. D., Hernandez, S., Tumlinson, J., Bland-Hawthorn, J., & Kim, T.-S. (2017) · The Astrophysical Journal · doi:10.3847/1538-4357/834/2/191 · Cited by 91
“G A ] 5 D ec 2 01 6 been observed in hard X-ray emission out to l ≈ 20◦ (BlandHawthorn & Cohen 2003a), soft X-ray emission at their base (0.3-1.0 keV; Snowden et al. 1997; Kataoka et al. 2013), K-band microwave emission (23-94 GHz; Finkbeiner 2004; Dobler & Finkbeiner 2008), and polarized radio…”
BackgroundInfluentialTHE STRUCTURE OF THE LOCAL HOT BUBBLE
Liu, W., Chiao, M., Collier, M. R., Cravens, T., Galeazzi, M., Koutroumpa, D., Kuntz, K. D., Lallement, R., Lepri, S. T., McCammon, D., et al. (2016) · The Astrophysical Journal · doi:10.3847/1538-4357/834/1/33 · Cited by 90
“In this paper we reevaluate the properties of the LHB based on the RASS data (Snowden et al. 1997) combined with the estimate of the SWCX contribution from DXL.”
BackgroundMethodSelf-citationThe Evolution of Structure in X-ray Clusters of GalaxiesPreprint
Jeltema, T., CANIZARES, C. R., Bautz, M. W., & Buote, D. A. (2004) · Cited by 89
Metadata
- Authors
- Snowden, S. L., Egger, R., Freyberg, M. J., McCammon, D., Plucinsky, P. P., Sanders, W. T., Schmitt, J. H. M. M., Trumper, J., & Voges, W.
- Affiliations
- Goddard Space Flight Center (US)
- Max Planck Institute for Extraterrestrial Physics (DE)
- University of Wisconsin–Madison (US)
- Venue
- The Astrophysical Journal
- Publisher
- American Astronomical Society
- Published
- 1997-08-10
- Volume
- 485
- Issue
- 1
- Pages
- 125-135
- ISSN
- 0004-637X (ISSN-L)
- 1538-4357
- OpenAlex
- W1982655690
- Cited by
- 602
- References
- 53
- Citations by year
- 2026: 13 · 2025: 16 · 2024: 17 · 2023: 22 · 2022: 19 · 2021: 16 · 2020: 25 · 2019: 12 · 2018: 24 · 2017: 19 · 2016: 25 · 2015: 33 · 2014: 28 · 2013: 26 · 2012: 22
- FWCI
- 10.43
- Type
- journal article
- Language
- en
- Open access
- bronze
- doi.org
- Locations
- The Astrophysical Journal (publishedVersion)
- Funders
- National Aeronautics and Space Administration
- Universities Space Research Association
- Bundesministerium für Bildung und Forschung
- Max-Planck-Gesellschaft
- Goddard Space Flight Center
- Topics
- Physical Sciences › Physics and Astronomy › Astronomy and Astrophysics › Astrophysical Phenomena and Observations
- Physical Sciences › Physics and Astronomy › Astronomy and Astrophysics › Galaxies: Formation, Evolution, Phenomena
- Physical Sciences › Physics and Astronomy › Nuclear and High Energy Physics › Astrophysics and Cosmic Phenomena
- Keywords
- soft X-ray background, diffuse X-ray emission, ROSAT All-Sky Survey, Galactic Center, Loop I, Galactic bulge, hot gas, X-ray absorption, Galactic plane, collisional ionization equilibrium
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