COSMOS PHOTOMETRIC REDSHIFTS WITH 30-BANDS FOR 2-deg2

被引：1054

作者：

Ilbert, O. ^{[1
]}

Capak, P. ^{[2
]}

Salvato, M.

Aussel, H. ^{[3
]}

McCracken, H. J. ^{[4
]}

Sanders, D. B. ^{[1
]}

Scoville, N.

Kartaltepe, J. ^{[1
]}

Arnouts, S. ^{[5
]}

Le Floc'h, E. ^{[1
]}

Mobasher, B. ^{[6
]}

Taniguchi, Y. ^{[7
]}

Lamareille, F. ^{[8
]}

Leauthaud, A. ^{[9
]}

Sasaki, S. ^{[10
,11
]}

Thompson, D. ^{[12
]}

Zamojski, M.

Zamorani, G. ^{[13
]}

Bardelli, S. ^{[13
]}

Bolzonella, M. ^{[13
]}

Bongiorno, A. ^{[9
]}

Brusa, M. ^{[14
]}

Caputi, K. I. ^{[15
]}

Carollo, C. M. ^{[15
]}

Contini, T. ^{[8
]}

Cook, R.

Coppa, G. ^{[13
]}

Cucciati, O. ^{[16
]}

De La Torre, S. ^{[10
]}

de Ravel, L. ^{[10
]}

Franzetti, P. ^{[17
]}

Garilli, B. ^{[17
]}

Hasinger, G. ^{[14
]}

Iovino, A. ^{[16
]}

Kampczyk, P. ^{[15
]}

Kneib, J. -P. ^{[9
]}

Knobel, C. ^{[15
]}

Kovac, K. ^{[15
]}

Le Borgne, J. F. ^{[8
]}

Le Brun, V. ^{[9
]}

Le Fevre, O. ^{[10
]}

Lilly, S. ^{[15
]}

Looper, D. ^{[1
]}

Maier, C. ^{[15
]}

Mainieri, V. ^{[8
]}

Mellier, Y. ^{[4
]}

Mignoli, M. ^{[13
]}

Murayama, T. ^{[11
]}

Pello, R. ^{[8
]}

Peng, Y. ^{[15
]}

机构：

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

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

[3] Univ Paris 07, CNRS, CEA, AIM Unite Mixte Rech,UMR 158, Paris, France

[4] Univ Paris 06, CNRS, UMR7095, Inst Astrophys Paris, F-75014 Paris, France

[5] Canada France Hawaii Telescope Corp, Kamuela, HI 96743 USA

[6] Univ Calif Riverside, Dept Phys & Astron, Riverside, CA 92521 USA

[7] Ehime Univ, Res Ctr Space & Cosm Evolut, Matsuyama, Ehime 7908577, Japan

[8] Max Planck Inst Extraterr Phys, D-85478 Garching, Germany

[9] Univ Toulouse, CNRS, Lab Astrophys Toulouse Tarbes, F-31400 Toulouse, France

[10] Lab Astrophys Marseille, F-13376 Marseille 12, France

[11] Tohoku Univ, Grad Sch Sci, Astron Inst, Aoba Ku, Sendai, Miyagi 9808578, Japan

[12] Ehime Univ, Grad Sch Sci & Engn, Dept Phys, Matsuyama, Ehime 7908577, Japan

[13] Univ Arizona, Large Binocular Telescope Observ, Tucson, AZ 85721 USA

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

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

[16] Osserv Astron Brera, INAF, Milan, Italy

[17] IASF Milano, INAF, I-20133 Milan, Italy

[18] Univ Padua, Dipartimento Astron, I-35122 Padua, Italy

[19] Columbia Univ, Dept Astron, New York, NY 10027 USA

[20] European So Observ, D-85748 Garching, Germany

来源：

ASTROPHYSICAL JOURNAL | 2009年 / 690卷 / 02期

基金：

美国国家科学基金会;

关键词：

galaxies: distances and redshifts; galaxies: evolution; galaxies: formation; STAR-FORMING GALAXIES; HUBBLE-DEEP-FIELD; SPECTRAL ENERGY-DISTRIBUTIONS; ARTIFICIAL NEURAL-NETWORKS; LUMINOSITY FUNCTIONS; LEGACY SURVEY; TO; 2.5; EVOLUTION; DUST; 1ST;

D O I：

10.1088/0004-637X/690/2/1236

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We present accurate photometric redshifts (photo-z) in the 2-deg(2) COSMOS field. The redshifts are computed with 30 broad, intermediate, and narrowbands covering the UV (Galaxy Evolution Explorer), visible near-IR (NIR; Subaru, Canada-France-Hawaii Telescope (CFHT), United Kingdom Infrared Telescope, and National Optical Astronomy Observatory), and mid-IR (Spitzer/IRAC). A chi(2) template-fitting method (Le Phare) was used and calibrated with large spectroscopic samples from the Very Large Telescope Visible Multi-Object Spectrograph and the Keck Deep Extragalactic Imaging Multi-Object Spectrograph. We develop and implement a new method which accounts for the contributions from emission lines ([O II], H beta, H alpha, and Ly alpha) to the spectral energy distributions (SEDs). The treatment of emission lines improves the photo-z accuracy by a factor of 2.5. Comparison of the derived photo-z with 4148 spectroscopic redshifts (i.e., Delta z = z(s) - z(p)) indicates a dispersion of sigma(Delta z)/((1+zs)) = 0.007 at i(AB)(+) 22.5, a factor of 2-6 times more accurate than earlier photo-z in the COSMOS, CFHT Legacy Survey, and the Classifying Object by Medium-Band Observations-17 survey fields. At fainter magnitudes i(AB)(+) < 24 and z < 1.25, the accuracy is sigma(Delta z/(1+zs)) = 0.012. The deep NIR and Infrared Array Camera coverage enables the photo-z to be extended to z similar to 2, albeit with a lower accuracy (sigma(Delta z/(1+zs)) = 0.06 at i(AB)(+) similar to 24). The redshift distribution of large magnitude-selected samples is derived and the median redshift is found to range from z(m) = 0.66 at 22 < i(AB)(+) < 22.5 to zm = 1.06 at 24.5 i(AB)(+) < 25. At i(AB)(+) < 26.0, the multiwavelength COSMOS catalog includes approximately 607,617 objects. The COSMOS-30 photo-z enables the full exploitation of this survey for studies of galaxy and large-scale structure evolution at high redshift.

引用

页码：1236 / 1249

页数：14

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