Redshift distribution of extragalactic 24 μm sources

被引:33
作者
Desai, Vandana [1 ]
Soifer, B. T.
Dey, Arjun [2 ]
Jannuzi, Buell T. [2 ]
Le Floc'h, Emeric [3 ,4 ]
Bian, Chao
Brand, Kate [2 ,5 ]
Brown, Michael J. I. [6 ]
Armus, Lee
Weedman, Dan W. [7 ]
Cool, Richard [3 ]
Stern, Daniel [8 ]
Brodwin, Mark [2 ]
机构
[1] CALTECH, Div Phys Math & Astron, Spitzer Sci Ctr, Pasadena, CA 91125 USA
[2] Natl Opt Astron Observ, Tucson, AZ 85726 USA
[3] Univ Arizona, Steward Observ, Tucson, AZ 85721 USA
[4] Univ Hawaii, Inst Astron, Honolulu, HI 96822 USA
[5] Space Telescope Sci Inst, Baltimore, MD 21218 USA
[6] Monash Univ, Sch Phys, Clayton, Vic 3800, Australia
[7] Cornell Univ, Dept Astron, Ithaca, NY 14853 USA
[8] CALTECH, Jet Prop Lab, Pasadena, CA 91109 USA
关键词
galaxies : distances and redshifts; galaxies : evolution; galaxies : formation; infrared : galaxies;
D O I
10.1086/587637
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
We present the redshift distribution of a complete, unbiased sample of 24 mu m sources down to f(nu)(24 mu m) 300 mu Jy ( 5 sigma). The sample consists of 591 sources detected in the Bootes field of the NOAO Deep Wide-Field Survey. We have obtained optical spectroscopic redshifts for 421 sources (71%). These have a redshift distribution peaking at z similar to 0: 3, with a possible additional peak at z similar to 0.9, and objects detected out to z = 4.5. The spectra of the remaining 170 (29%) exhibit no strong emission lines from which to determine a redshift. We develop an algorithm to estimate the redshift distribution of these sources, based on the assumption that they have emission lines but that these lines are not observable due to the limited wavelength coverage of our spectroscopic observations. The redshift distribution derived from all 591 sources exhibits an additional peak of extremely luminous (L8-1000 mu m > 3 x 10(12) L-circle dot) objects at z similar to 2, consisting primarily of sources without observable emission lines. We use optical line diagnostics and IRAC colors to estimate that 55% of the sources within this peak are AGN-dominated. We compare our results to published models of the evolution of infrared-luminous galaxies. The models which best reproduce our observations predict a large population of star-formation-dominated ULIRGs at z > 1.5 rather than the AGN-dominated sources we observe.
引用
收藏
页码:1204 / 1217
页数:14
相关论文
共 100 条
[1]  
Abergel A, 1996, ASTRON ASTROPHYS, V308, pL5
[2]   A LARGE SAMPLE OF SOUTHERN IRAS GALAXIES - SPECTRAL CLASSES AND SUPERCLUSTERING [J].
ALLEN, DA ;
NORRIS, RP ;
MEADOWS, VS ;
ROCHE, PF .
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 1991, 248 (03) :528-543
[3]  
Altieri B, 1999, ASTRON ASTROPHYS, V343, pL65
[4]   LONG-SLIT OPTICAL SPECTROSCOPY OF POWERFUL FAR-INFRARED GALAXIES - THE NATURE OF THE NUCLEAR-ENERGY SOURCE [J].
ARMUS, L ;
HECKMAN, TM ;
MILEY, GK .
ASTROPHYSICAL JOURNAL, 1989, 347 (02) :727-742
[5]  
Aussel H, 1999, ASTRON ASTROPHYS, V342, P313
[6]   Luminosity functions for galaxies and quasars in the Spitzer wide-area infrared extragalactic legacy survey [J].
Babbedge, T. S. R. ;
Rowan-Robinson, M. ;
Vaccari, M. ;
Surace, J. A. ;
Lonsdale, C. J. ;
Clements, D. L. ;
Fang, F. ;
Farrah, D. ;
Franceschini, A. ;
Gonzalez-Solares, E. ;
Hatziminaoglou, E. ;
Lacey, C. G. ;
Oliver, S. ;
Onyett, N. ;
Perez-Fournon, I. ;
Polletta, M. ;
Pozzi, F. ;
Rodighiero, G. ;
Shupe, D. L. ;
Siana, B. ;
Smith, H. E. .
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 2006, 370 (03) :1159-1180
[7]   Submillimeter galaxies [J].
Blain, AW ;
Smail, I ;
Ivison, RJ ;
Kneib, JP ;
Frayer, DT .
PHYSICS REPORTS-REVIEW SECTION OF PHYSICS LETTERS, 2002, 369 (02) :111-176
[8]   Optical line diagnostics of z ≈ 2 optically faint ultraluminous infrared galaxies in the Spitzer Bootes survey [J].
Brand, K. ;
Dey, A. ;
Desai, V. ;
Soifer, B. T. ;
Bian, C. ;
Armus, L. ;
Brown, M. J. I. ;
Le Floc'h, E. ;
Higdon, S. J. ;
Houck, J. R. ;
Jannuzi, B. T. ;
Weedman, D. W. .
ASTROPHYSICAL JOURNAL, 2007, 663 (01) :204-217
[9]   The active galactic nuclei contribution to the mid-infrared emission of luminous infrared galaxies [J].
Brand, K. ;
Dey, A. ;
Weedman, D. ;
Desai, V. ;
Le Floc'h, E. ;
Jannuzi, B. T. ;
Soifer, B. T. ;
Brown, M. J. I. ;
Eisenhardt, P. ;
Gorjian, V. ;
Papovich, C. ;
Smith, H. A. ;
Willner, S. P. ;
Cool, R. J. .
ASTROPHYSICAL JOURNAL, 2006, 644 (01) :143-147
[10]   Photometric redshifts in the IRAC Shallow Survey [J].
Brodwin, M. ;
Brown, M. J. I. ;
Ashby, M. L. N. ;
Bian, C. ;
Brand, K. ;
Dey, A. ;
Eisenhardt, P. R. ;
Eisenstein, D. J. ;
Gonzalez, A. H. ;
Huang, J. -S. ;
Jannuzi, B. T. ;
Kochanek, C. S. ;
McKenzie, E. ;
Murray, S. S. ;
Pahre, M. A. ;
Smith, H. A. ;
Soifer, B. T. ;
Stanford, S. A. ;
Stern, D. ;
Elston, R. J. .
ASTROPHYSICAL JOURNAL, 2006, 651 (02) :791-803