THE AVERAGE PHYSICAL PROPERTIES AND STAR FORMATION HISTORIES OF THE UV-BRIGHTEST STAR-FORMING GALAXIES AT z ∼ 3.7

被引:60
作者
Lee, Kyoung-Soo [1 ]
Dey, Arjun [2 ]
Reddy, Naveen [2 ]
Brown, Michael J. I. [3 ]
Gonzalez, Anthony H. [4 ]
Jannuzi, Buell T. [2 ]
Cooper, Michael C. [5 ]
Fan, Xiaohui [5 ]
Bian, Fuyan [5 ]
Glikman, Eilat [1 ]
Stern, Daniel [6 ]
Brodwin, Mark [7 ]
Cooray, Asantha [8 ]
机构
[1] Yale Univ, Dept Phys, Yale Ctr Astron & Astrophys, New Haven, CT 06520 USA
[2] Natl Opt Astron Observ, Tucson, AZ 85726 USA
[3] Monash Univ, Sch Phys, Clayton, Vic 3800, Australia
[4] Univ Florida, Dept Astron, Gainesville, FL 32611 USA
[5] Univ Arizona, Steward Observ, Tucson, AZ 85721 USA
[6] CALTECH, Jet Prop Lab, Pasadena, CA 91109 USA
[7] Harvard Smithsonian Ctr Astrophys, Cambridge, MA 02138 USA
[8] Univ Calif Irvine, Sch Phys Sci, Irvine, CA 92697 USA
基金
美国国家科学基金会;
关键词
cosmology: observations; dust; extinction; galaxies: evolution; galaxies: formation; galaxies: high-redshift; galaxies: stellar content; LYMAN-BREAK GALAXIES; ULTRAVIOLET LUMINOSITY DENSITY; STELLAR MASS FUNCTION; HIGH-REDSHIFT; DUST OBSCURATION; CONTINUUM SLOPE; LARGE-SCALE; DEEP FIELD; EVOLUTION; Z-SIMILAR-TO-2;
D O I
10.1088/0004-637X/733/2/99
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
We investigate the average physical properties and star formation histories (SFHs) of the most UV-luminous star-forming galaxies at z similar to 3.7. Our results are based on the average spectral energy distributions (SEDs), constructed from stacked optical-to-infrared photometry, of a sample of the 1913 most UV-luminous star-forming galaxies found in 5.3 deg(2) of the NOAO Deep Wide-Field Survey. We find that the shape of the average SED in the rest optical and infrared is fairly constant with UV luminosity, i.e., more UV-luminous galaxies are, on average, also more luminous at longer wavelengths. In the rest UV, however, the spectral slope beta (equivalent to dlogF(lambda)/dlog lambda; measured at 0.13 mu m < lambda(rest) < 0.28 mu m) rises steeply with the median UV luminosity from -1.8 at L approximate to L* to -1.2 (L approximate to 4-5L*). We use population synthesis analyses to derive their average physical properties and find that (1) L-UV and thus star formation rates (SFRs) scale closely with stellar mass such that more UV-luminous galaxies are also more massive, (2) the median ages indicate that the stellar populations are relatively young (200-400 Myr) and show little correlation with UV luminosity, and (3) more UV-luminous galaxies are dustier than their less-luminous counterparts, such that L approximate to 4-5L* galaxies are extincted up to A(1600) = 2 mag while L approximate to L* galaxies have A(1600) = 0.7-1.5 mag. We argue that the average SFHs of UV-luminous galaxies are better described by models in which SFR increases with time in order to simultaneously reproduce the tight correlation between the UV-derived SFR and stellar mass and their universally young ages. We demonstrate the potential of measurements of the SFR-M-* relation at multiple redshifts to discriminate between simple models of SFHs. Finally, we discuss the fate of these UV-brightest galaxies in the next 1-2 Gyr and their possible connection to the most massive galaxies at z similar to 2.
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页数:12
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