IDENTIFYING LUMINOUS ACTIVE GALACTIC NUCLEI IN DEEP SURVEYS: REVISED IRAC SELECTION CRITERIA

被引：516

作者：

Donley, J. L. ^{[1
]}

Koekemoer, A. M. ^{[1
]}

Brusa, M. ^{[2
]}

Capak, P. ^{[3
]}

Cardamone, C. N. ^{[4
]}

Civano, F. ^{[5
]}

Ilbert, O. ^{[6
]}

Impey, C. D. ^{[7
]}

Kartaltepe, J. S. ^{[8
]}

Miyaji, T. ^{[9
,10
]}

Salvato, M. ^{[2
]}

Sanders, D. B. ^{[11
]}

Trump, J. R. ^{[12
]}

Zamorani, G. ^{[13
]}

机构：

[1] Space Telescope Sci Inst, Baltimore, MD 21218 USA

[2] Max Planck Inst Extraterr Phys, D-85748 Garching, Germany

[3] CALTECH, Spitzer Sci Ctr, Pasadena, CA 91125 USA

[4] MIT, Dept Phys, Cambridge, MA 02139 USA

[5] Harvard Smithsonian Ctr Astrophys, Cambridge, MA 02138 USA

[6] Univ Aix Marseille 1, CNRS, Lab Astrophys Marseille, UMR 6110, F-13388 Marseille 13, France

[7] Univ Arizona, Steward Observ, Tucson, AZ 85721 USA

[8] Natl Opt Astron Observ, Tucson, AZ 85719 USA

[9] Univ Nacl Autonoma Mexico, Inst Astron, Ensenada, Baja California, Mexico

[10] Univ Calif San Diego, Ctr Astrophys & Space Sci, La Jolla, CA 92093 USA

[11] Univ Hawaii, Inst Astron, Honolulu, HI 96822 USA

[12] Univ Calif Santa Cruz, UCO Lick, Santa Cruz, CA 95064 USA

[13] INAF Osservatorio Astron Bologna, I-40127 Bologna, Italy

来源：

ASTROPHYSICAL JOURNAL | 2012年 / 748卷 / 02期

基金：

美国国家科学基金会;

关键词：

galaxies: active; infrared: galaxies; X-rays: galaxies; WIDE-FIELD SURVEY; ULTRALUMINOUS INFRARED GALAXIES; SPITZER-SPACE-TELESCOPE; RAY SPECTRAL PROPERTIES; STAR-FORMATION HISTORY; HIGH-REDSHIFT GALAXIES; EXTENDED GROTH STRIP; DISTANT RED GALAXIES; POWER-LAW GALAXIES; AGN DUSTY TORI;

D O I：

10.1088/0004-637X/748/2/142

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

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 L2-10 (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.

引用

页数：22

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