The DOI matches its Crossref record; 11 of the 11 references it cites were found in a registry or an index.
Obscured and Unobscured Active Galactic Nuclei in the Spitzer Space Telescope First Look Survey
Open accessAbstract
Selection of active galactic nuclei (AGNs) in the infrared facilitates the discovery of AGNs whose optical emission is extinguished by dust. In this paper, we use the Spitzer Space Telescope First Look Survey (FLS) to assess the fraction of AGNs with mid-infrared (MIR) luminosities that are comparable to quasars and that are missed in optical quasar surveys because of dust obscuration. We begin by using the Sloan Digital Sky Survey (SDSS) database to identify 54 quasars within the 4 deg^2 extragalactic FLS. These quasars occupy a distinct region in MIR color space by virtue of their strong, red continua. This has allowed us to define an MIR color criterion for selecting AGN candidates. About 2000 FLS objects have colors that are consistent with them being AGNs, but most are much fainter in the MIR than the SDSS quasars, which typically have 8 μm flux densities S_(8.0) ~ 1 mJy. We have investigated the properties of 43 objects with S_(8.0) ≥ 1 mJy that satisfy our AGN color selection. This sample should contain both unobscured quasars as well as AGNs that are absent from the SDSS survey because of extinction in the optical. After removing 16 known quasars, three probable normal quasars, and eight spurious or confused objects from the initial sample of 43, we are left with 16 objects that are likely to be obscured quasars or luminous Seyfert 2 galaxies. This suggests that the numbers of obscured and unobscured AGNs are similar in samples selected in the MIR at S_(8.0) ~ 1 mJy.
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Cites
The Demography of Massive Dark Objects in Galaxy Centers
Magorrian, J., Tremaine, S., Richstone, D., Bender, R., Bower, G., Dressler, A., Faber, S. M., Gebhardt, K., Green, R., Grillmair, C., et al. (1998) · The Astronomical Journal · doi:10.1086/300353 · Cited by 4,007
The Infrared Array Camera (IRAC) for the Spitzer Space Telescope
Fazio, G. G., Hora, J. L., Allen, L. E., Ashby, M. L. N., Barmby, P., Deutsch, L. K., Huang, J. ‐., Kleiner, S., Marengo, M., Megeath, S. T., et al. (2004) · The Astrophysical Journal Supplement Series · doi:10.1086/422843 · Cited by 3,318
Self-citationThe Spitzer Space Telescope Mission
Werner, M. W., Roellig, T. L., Low, F. J., Rieke, G. H., Rieke, M., Hoffmann, W. F., Young, E., Houck, J. R., Brandl, B., Fazio, G. G., et al. (2004) · The Astrophysical Journal Supplement Series · doi:10.1086/422992 · Cited by 2,851
Self-citationThe Multiband Imaging Photometer for Spitzer (MIPS)
Rieke, G. H., Young, E. T., Engelbracht, C. W., Kelly, D. M., Low, F. J., Haller, E. E., Beeman, J. W., Gordon, K. D., Stansberry, J. A., Misselt, K. A., et al. (2004) · The Astrophysical Journal Supplement Series · doi:10.1086/422717 · Cited by 2,044
Self-citationSpectral evolution of stellar populations using isochrone synthesis
Bruzual A., G., & Charlot, S. (1993) · The Astrophysical Journal · doi:10.1086/172385 · Cited by 1,808
Red and Reddened Quasars in the Sloan Digital Sky Survey
Richards, G. T., Hall, P. B., Vanden Berk, D. E., Strauss, M. A., Schneider, D. P., Weinstein, M. A., Reichard, T. A., York, D. G., Knapp, G. R., Fan, X., et al. (2003) · The Astronomical Journal · doi:10.1086/377014 · Cited by 394
Zakamska, N. L., Strauss, M. A., Krolik, J. H., Collinge, M. J., Hall, P. B., Hao, L., Heckman, T. M., Ivezi, E., Richards, G. T., Schlegel, D. J., et al. (2003) · The Astronomical Journal · doi:10.1086/378610 · Cited by 363
Evidence for a large undetected population of dust-reddened quasars
Webster, R. L., Francis, P. J., Petersont, B. A., Drinkwater, M. J., & Masci, F. J. (1995) · Nature · doi:10.1038/375469a0 · Cited by 247
Self-citationThe Sloan Digital Sky Survey Quasar Catalog. II. First Data Release
Schneider, D. P., Fan, X., Hall, P. B., Jester, S., Richards, G. T., Stoughton, C., Strauss, M. A., SubbaRao, M., Vanden Berk, D. E., Anderson, S. F., et al. (2003) · The Astronomical Journal · doi:10.1086/379174 · Cited by 201
Gregg, M. D., Lacy, M. D., White, R. L., et al. (2002) · The Astrophysical Journal · doi:10.1086/324145 · Cited by 125
Self-citation
Cited by
Mid‐Infrared Selection of Active Galaxies
Stern, D., Eisenhardt, P., Gorjian, V., Kochanek, C. S., Caldwell, N., Eisenstein, D., Brodwin, M., Brown, M. J. I., Cool, R., Dey, A., et al. (2005) · The Astrophysical Journal · doi:10.1086/432523 · Cited by 929
Polletta, M., Tajer, M., Maraschi, L., Trinchieri, G., Lonsdale, C. J., Chiappetti, L., Andreon, S., Pierre, M., Le Fevre, O., Zamorani, G., et al. (2007) · The Astrophysical Journal · doi:10.1086/518113 · Cited by 869
Self-citationDusty star-forming galaxies at high redshift
Casey, C. M., Narayanan, D., & Cooray, A. (2014) · Physics Reports · doi:10.1016/j.physrep.2014.02.009 · Cited by 800
THE SPITZER-WISE SURVEY OF THE ECLIPTIC POLES
Jarrett, T. H., Cohen, M., Masci, F., Wright, E., Stern, D., Benford, D., Blain, A., Carey, S., Cutri, R. M., Eisenhardt, P., et al. (2011) · The Astrophysical Journal · doi:10.1088/0004-637x/735/2/112 · Cited by 717
Self-citationActive galactic nuclei: what’s in a name?
Padovani, P., Alexander, D. M., Assef, R. J., De Marco, B., Giommi, P., Hickox, R. C., Richards, G. T., Smolčić, V., Hatziminaoglou, E., Mainieri, V., et al. (2017) · The Astronomy and Astrophysics Review · doi:10.1007/s00159-017-0102-9 · Cited by 666
Metadata
- Authors
- Lacy, M., Storrie‐Lombardi, L. J., Sajina, A., Appleton, P. N., Armus, L., Chapman, S. C., Choi, P. I., Fadda, D., Fang, F., Frayer, D. T., Heinrichsen, I., Helou, G., Im, M., Marleau, F. R., Masci, F., Shupe, D. L., Soifer, B. T., Surace, J., Teplitz, H. I., Wilson, G., & Yan, L.
- Venue
- The Astrophysical Journal Supplement Series
- Publisher
- American Astronomical Society
- Published
- 2004-09
- Volume
- 154
- Issue
- 1
- Pages
- 166-169
- ISSN
- 0067-0049 (ISSN-L)
- 1538-4365
- OpenAlex
- W2109104929
- Cited by
- 687
- References
- 11
- FWCI
- 14.77
- Type
- journal article
- Language
- en
- Open access
- green
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- Lacy, M., Storrie‐Lombardi, L. J., Sajina, A., Appleton, P. N., Armus, L., Chapman, S. C., Choi, P. I., Fadda, D., Fang, F., Frayer, D. T., Heinrichsen, I., Helou, G., Im, M., Marleau, F. R., Masci, F., Shupe, D. L., Soifer, B. T., Surace, J., Teplitz, H. I., . . . Yan, L. (2004). Obscured and Unobscured Active Galactic Nuclei in the Spitzer Space Telescope First Look Survey. The Astrophysical Journal Supplement Series. https://doi.org/10.1086/422816
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