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IDENTIFYING LUMINOUS ACTIVE GALACTIC NUCLEI IN DEEP SURVEYS: REVISED IRAC SELECTION CRITERIA
Open accessAbstract
Spitzer /IRAC selection is a powerful tool for identifying luminous active galactic nuclei (AGNs). For deep IRAC data, however, the AGN selection wedges currently in use are heavily contaminated by star-forming galaxies, especially at high redshift. Using the large samples of luminous AGNs and high-redshift star-forming galaxies in COSMOS, we redefine the AGN selection criteria for use in deep IRAC surveys. The new IRAC criteria are designed to be both highly complete and reliable, and incorporate the best aspects of the current AGN selection wedges and of infrared power-law selection while excluding high-redshift star-forming galaxies selected via the BzK, distant red galaxy, Lyman-break galaxy, and submillimeter galaxy criteria. At QSO luminosities of log L 2–10 keV (erg s −1 ) ⩾44, the new IRAC criteria recover 75% of the hard X-ray and IRAC-detected XMM -COSMOS sample, yet only 38% of the IRAC AGN candidates have X-ray counterparts, a fraction that rises to 52% in regions with Chandra exposures of 50–160 ks. X-ray stacking of the individually X-ray non-detected AGN candidates leads to a hard X-ray signal indicative of heavily obscured to mildly Compton-thick obscuration (log N H (cm −2 ) = 23.5 ± 0.4). While IRAC selection recovers a substantial fraction of luminous unobscured and obscured AGNs, it is incomplete to low-luminosity and host-dominated AGNs.
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Cited by
CONSTRAINING THE LOW-MASS SLOPE OF THE STAR FORMATION SEQUENCE AT 0.5 <z< 2.5
Whitaker, K. E., Franx, M., Leja, J., van Dokkum, P. G., Henry, A., Skelton, R. E., Fumagalli, M., Momcheva, I. G., Brammer, G. B., Labbé, I., et al. (2014) · The Astrophysical Journal · doi:10.1088/0004-637x/795/2/104 · Cited by 854
Dusty 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
Active 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
Self-citationGreene, J. E., Labbe, I., Goulding, A. D., Furtak, L. J., Chemerynska, I., Kokorev, V., Dayal, P., Volonteri, M., Williams, C. C., Wang 王, B. 冰., et al. (2024) · The Astrophysical Journal · doi:10.3847/1538-4357/ad1e5f · Cited by 429
Mateos, S., Alonso-Herrero, A., Carrera, F. J., Blain, A., Watson, M. G., Barcons, X., Braito, V., Severgnini, P., Donley, J. L., & Stern, D. (2012) · Monthly Notices of the Royal Astronomical Society · doi:10.1111/j.1365-2966.2012.21843.x · Cited by 349
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Metadata
- Authors
- Donley, J. L., Koekemoer, A. M., Brusa, M., Capak, P., Cardamone, C. N., Civano, F., Ilbert, O., Impey, C. D., Kartaltepe, J. S., Miyaji, T., Salvato, M., Sanders, D. B., Trump, J. R., & Zamorani, G.
- Venue
- The Astrophysical Journal
- Publisher
- American Astronomical Society
- Published
- 2012-03-16
- Volume
- 748
- Issue
- 2
- Pages
- 142
- ISSN
- 0004-637X (ISSN-L)
- 1538-4357
- OpenAlex
- W2090818992
- Cited by
- 634
- References
- 0
- FWCI
- 29.23
- Type
- journal article
- Language
- en
- Open access
- bronze
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- Donley, J. L., Koekemoer, A. M., Brusa, M., Capak, P., Cardamone, C. N., Civano, F., Ilbert, O., Impey, C. D., Kartaltepe, J. S., Miyaji, T., Salvato, M., Sanders, D. B., Trump, J. R., & Zamorani, G. (2012). IDENTIFYING LUMINOUS ACTIVE GALACTIC NUCLEI IN DEEP SURVEYS: REVISED IRAC SELECTION CRITERIA. The Astrophysical Journal. https://doi.org/10.1088/0004-637x/748/2/142
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