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Cited by 223Cosmology and Gravitation TheoriesAstrophysics and Star Formation StudiesDark Matter and Cosmic Phenomena

Extended Anomalous Foreground Emission in the WMAP Three‐Year Data

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Dobler, Gregory, Finkbeiner, Douglas P.·2008·The Astrophysical Journal
DOI 10.1086/587862
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Abstract

We study the spectral and morphological characteristics of the diffuse Galactic emission in the WMAP temperature data using a template-based multilinear regression, and obtain the following results. (1) We confirm previous observations of a bump in the dust-correlated spectrum, consistent with the Draine & Lazarian spinning dust model. (2) We also confirm the "haze" signal in the inner Galaxy, and argue that it does not follow a free-free spectrum as first thought, but instead is synchrotron emission from a hard electron cosmic-ray population. (3) In a departure from previous work, we allow the spectrum of Hα-correlated emission (which is used to trace the free-free component) to float in the fit, and find that it does not follow the expected free-free spectrum. Instead there is a bump near 50 GHz, modifying the spectrum at the 20% level, which we speculate is caused by spinning dust in the warm ionized medium. (4) The derived cross-correlation spectra are not sensitive to the map zero points, but are sensitive to the choice of CMB estimator. In cases where the CMB estimator is derived by minimizing variance of a linear combination of the WMAP bands, we show that a bias proportional to the cross-correlation of each template and the true CMB is always present. This bias can be larger than any of the foreground signals in some bands. (5) Lastly, we consider the frequency coverage and sensitivity of the Planck mission, and suggest linear combination coefficients for the CMB template that will reduce both the statistical and systematic uncertainty in the synchrotron and haze spectra by more than an order of magnitude.

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Crossref · 10.1086/587862

Cites

36 of 36 references verified0 citation errors · 0 not checkable

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  • The microwave haze is of synchrotron origin, independent of the free-free emission template, with a spectral index β = 2.4-2.7.

    “The haze was later found to be of synchrotron origin, independent of the free-free emission template, with a spectral index ( Tb ∝ ν -β ) of β = 2 . 4 -2 . 7 (Dobler & Finkbeiner 2008; Su et al. 2010).”

    From The Fermi/eROSITA bubbles: a look into the nuclear outflow from the Milky Way (2024) · cites this paper as Dobler & Finkbeiner 2008

    Section 3.4 concludes that synchrotron is the most likely source of the haze, rather than free-free emission; Section 5 reports that the haze remains after the free-free template is removed. But Section 5 also says the haze spectrum is very uncertain, and Table 2 gives spectral slopes outside the claimed β = 2.4–2.7 range. The paper therefore supports the interpretation and separation from the free-free template, but not a definite spectral-index range. (LLM, conf=0.88)

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  • The spectral index β for the Loop-I is about 3, indicating a cosmic-ray electron index of p about 3 at high latitudes.

    “It is found that the spectral index, β , (brightness temperature, Tb ∝ ν -β ) for the Loop-I is ≃ 3 (Finkbeiner 2004; Davies et al. 2006; Dobler & Finkbeiner 2008), indicating a CR electron index of p ≃ 3 at the high latitudes (following p = 2 β -3 for synchrotron emission).”

    From The Fermi/eROSITA bubbles: a look into the nuclear outflow from the Milky Way (2024) · cites this paper as Dobler & Finkbeiner 2008

    Section 2.1 (page unavailable) says a synchrotron spectral index of about −3.05 removes most high-latitude emission, notably the north Galactic spur. Our copy does not explicitly identify that feature as Loop I. The electron index p ≃ 3 is the citing authors’ inference after the citation, rather than a result stated in this source. (LLM, conf=0.78)

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  • In the past two decades, it has become increasingly clear that the Milky Way is a system with a large-scale (greater than about a kpc) outflow where a multi-wavelength observation of the feedback process is possible.

    “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 Dobler & Finkbeiner 2008

    Section 3.1 reports extended microwave haze near the Galactic center, and Section 5 discusses possible sources of that emission. Neither identifies it as a kiloparsec-scale outflow or describes multi-wavelength observation of a feedback process; searches for outflow, wind, and feedback found no supporting passage. (LLM, conf=0.76)

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Research works printed but not linked: 1

  1. ´rski, K. M., Hivon, E., & Wandelt, B. D. 1999, in MPA / ESO Cosmology Conf. on Evolution of Large-Scale Structure, ed. A. J. Banday, R. K. Sheth, & L. N. da Costa (Garching: ESO), 37

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Authors
Dobler, G., & Finkbeiner, D. P.
Affiliations
Harvard University (US)
ORCID
Venue
The Astrophysical Journal
Publisher
American Astronomical Society
Published
2008-06-20
Volume
680
Issue
2
Pages
1222-1234
ISSN
  • 0004-637X (ISSN-L)
  • 1538-4357
DOI
10.1086/587862
OpenAlex
W1970145818
Cited by
223
References
36
Citations by year
2024: 3 · 2023: 5 · 2022: 11 · 2021: 6 · 2020: 5 · 2019: 3 · 2018: 7 · 2017: 6 · 2016: 10 · 2015: 16 · 2014: 10 · 2013: 20 · 2012: 28
FWCI
18.08
Type
journal article
Language
en
Open access
Locations
  • The Astrophysical Journal (publishedVersion)
  • arXiv (Cornell University) (submittedVersion)
  • Digital Access to Scholarship at Harvard (DASH) (Harvard University) (submittedVersion, cc-by)
  • arXiv (Cornell University)
Funders
  • National Aeronautics and Space Administration (NAG512972, 12972)
  • Goddard Space Flight Center
  • Astrophysics Division
Topics
  • Physical Sciences › Physics and Astronomy › Astronomy and Astrophysics › Cosmology and Gravitation Theories
  • Physical Sciences › Physics and Astronomy › Astronomy and Astrophysics › Astrophysics and Star Formation Studies
  • Physical Sciences › Physics and Astronomy › Nuclear and High Energy Physics › Dark Matter and Cosmic Phenomena
Keywords
spinning dust, synchrotron radiation, free-free emission, H-alpha emission, warm ionized medium, WMAP three-year data

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