Magellan spectroscopy of AGN candidates in the COSMOS field

被引：105

作者：

Trump, Jonathan R.

Impey, Chris D.

McCarthy, Patrick J.

Elvis, Martin

Huchra, John P.

Brusa, Marcella

Hasinger, Gunther

Schinnerer, Eva

Capak, Peter

Lilly, Simon J.

Scoville, Nick Z.

机构：

[1] Observ Carnegie Inst Washington, Pasadena, CA 91101 USA

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

[3] Max Planck Inst Extraterr Phys, D-37075 Garching, Germany

[4] Max Planck Inst Astron, D-69117 Heidelberg, Germany

[5] CALTECH, Pasadena, CA 91125 USA

[6] ETH, Dept Phys, CH-8093 Zurich, Switzerland

来源：

ASTROPHYSICAL JOURNAL SUPPLEMENT SERIES | 2007年 / 172卷 / 01期

关键词：

galaxies : active; quasars : general; surveys; DIGITAL-SKY-SURVEY; ACTIVE GALACTIC NUCLEI; STAR-FORMING GALAXIES; HELLAS2XMM SURVEY; REDSHIFT SURVEY; LUMINOSITY; EVOLUTION; SAMPLE; SPECTRA; IDENTIFICATION;

D O I：

10.1086/516578

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We present spectroscopic redshifts for the first 466 X-ray-and radio-selected AGN targets in the 2 deg(2) COSMOS field. Spectra were obtained with the IMACS instrument on the Magellan (Baade) telescope, using the nod-and-shuffle technique. We identify a variety of type 1 and type 2 AGNs, as well as red galaxies with no emission lines. Our red-shift yield is 72% down to i(AB) 24, although the yield is > 90% for iAB < 22. We expect the completeness to increase as the survey continues. When our survey is complete and additional redshifts from the zCOSMOS project are included, we anticipate similar to 1100 AGNs with redshifts over the entire COSMOS field. Our redshift survey is consistent with an obscured AGN population that peaks at z similar to 0: 7, although further work is necessary to disentangle the selection effects.

引用

页码：383 / 395

页数：13

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