THE FMOS-COSMOS SURVEY OF STAR-FORMING GALAXIES AT z ∼ 1.6. I. Hα-BASED STAR FORMATION RATES AND DUST EXTINCTION

被引：203

作者：

Kashino, D. ^{[1
]}

Silverman, J. D. ^{[2
]}

Rodighiero, G. ^{[3
]}

Renzini, A. ^{[4
]}

Arimoto, N. ^{[5
,6
]}

Daddi, E. ^{[7
]}

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

Sanders, D. B. ^{[9
]}

Kartaltepe, J. ^{[10
]}

Zahid, H. J. ^{[9
]}

Nagao, T. ^{[11
]}

Sugiyama, N. ^{[1
,2
]}

Capak, P. ^{[12
,13
]}

Carollo, C. M. ^{[8
]}

Chu, J. ^{[9
]}

Hasinger, G. ^{[9
]}

Ilbert, O. ^{[14
]}

Kajisawa, M. ^{[15
]}

Kewley, L. J. ^{[9
,16
]}

Koekemoer, A. M. ^{[17
]}

Kovac, K. ^{[8
]}

Le Fevre, O. ^{[14
]}

Masters, D. ^{[18
]}

McCracken, H. J. ^{[19
]}

Onodera, M. ^{[8
]}

Scoville, N. ^{[12
]}

Strazzullo, V. ^{[7
]}

Symeonidis, M. ^{[20
]}

Taniguchi, Y. ^{[15
]}

机构：

[1] Nagoya Univ, Grad Sch Sci, Div Particle & Astrophys Sci, Nagoya, Aichi 4648602, Japan

[2] Univ Tokyo, Todai Inst Adv Study, Kavli Inst Phys & Math Univ WPI, Kashiwa, Chiba 2778583, Japan

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

[4] INAF Osservatorio Astron Padova, I-35122 Padua, Italy

[5] Natl Astron Observ Japan, Subaru Telescope, Hilo, HI 96720 USA

[6] Grad Univ Adv Studies, Dept Astron Sci, Mitaka, Tokyo 1818588, Japan

[7] CEA Saclay, Serv Astrophys, F-91191 Gif Sur Yvette, France

[8] ETH, Inst Astron, CH-8093 Zurich, Switzerland

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

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

[11] Kyoto Univ, Hakubi Ctr Adv Res, Kyoto 6068302, Japan

[12] CALTECH, Pasadena, CA 91125 USA

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

[14] Aix Marseille Univ, CNRS, LAM, UMR 7326, F-13388 Marseille, France

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

[16] Australian Natl Univ, Res Sch Astron & Astrophys, Weston, ACT 2611, Australia

[17] Space Telescope Sci Inst, HST & JWST Instruments Sci Div, Baltimore, MD 21218 USA

[18] Observ Carnegie Inst Sci, Pasadena, CA 91101 USA

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

[20] Univ Coll London, Mullard Space Sci Lab, Dorking RH5 6NT, Surrey, England

来源：

ASTROPHYSICAL JOURNAL LETTERS | 2013年 / 777卷 / 01期

关键词：

galaxies: evolution; galaxies: general; galaxies: high-redshift; galaxies: ISM; galaxies: star formation; FORMATION RATE DENSITY; LUMINOSITY FUNCTION; HIGH-REDSHIFT; MASS; SPECTROSCOPY; ATTENUATION; UNIVERSE; METALLICITY; EVOLUTION; SEQUENCE;

D O I：

10.1088/2041-8205/777/1/L8

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We present the first results from a near-IR spectroscopic survey of the COSMOS field, using the Fiber Multi-Object Spectrograph on the Subaru telescope, designed to characterize the star-forming galaxy population at 1.4 < z < 1.7. The high-resolution mode is implemented to detect H alpha in emission between 1.6-1.8 mu m with f(H alpha) greater than or similar to 4 x 10(-17) erg cm(-2) s(-1). Here, we specifically focus on 271 sBzK-selected galaxies that yield a H alpha detection thus providing a redshift and emission line luminosity to establish the relation between star formation rate and stellar mass. With further J-band spectroscopy for 89 of these, the level of dust extinction is assessed by measuring the Balmer decrement using co-added spectra. We find that the extinction (0.6 less than or similar to A(H alpha) less than or similar to 2.5) rises with stellar mass and is elevated at high masses compared to low-redshift galaxies. Using this subset of the spectroscopic sample, we further find that the differential extinction between stellar and nebular emission E-star(B - V)/E-neb(B - V) is 0.7-0.8, dissimilar to that typically seen at low redshift. After correcting for extinction, we derive an H alpha-based main sequence with a slope (0.81 +/- 0.04) and normalization similar to previous studies at these redshifts.

引用

页数：6

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