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Massive Lyman Break Galaxies at z ~ 3 in the Spitzer Extragalactic First Look Survey

Shim, Hyunjin and Im, Myungshin and Choi, Phillip and Yan, Lin and Storrie-Lombardi, Lisa (2007) Massive Lyman Break Galaxies at z ~ 3 in the Spitzer Extragalactic First Look Survey. Astrophysical Journal, 669 (2). pp. 749-764. ISSN 0004-637X. doi:10.1086/522105.

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We investigate the properties of 1088 Lyman break galaxies (LBGs) at z ~ 3 selected from a ~2.63 deg^2 subregion of the First Look Survey field using the ground-based multicolor data and the Spitzer Space Telescope mid-infrared data at 3-8 and 24 μm. With the wide area and the broad wavelength coverage, we sample a large number of "rare" u-band dropouts that are massive (M_* > 10^(11) M_☉), allowing us to perform a statistical analysis of these subsets of LBGs which have not been studied in detail. Optically bright (R_(AB) ≤ 24.5 mag) LBGs detected in mid-infrared (S_(3.6 μm) ≥ 6 μJy) reside at the most massive and dusty end of the LBG population, with relatively high and tight M/L in rest-frame near-infrared. Most infrared-luminous LBGs (S_(24 μm) ≥ 100 μJy) are dusty star-forming galaxies with star formation rates of 100-1000 M_☉ yr^(-1), total infrared luminosity of >10^(12) L_☉. By constructing the UV luminosity function of massive LBGs, we estimate that the lower limit for the star formation rate density from LBGs more massive than 10^(11) M_☉ at z ~ 3 is ≥ 3.3 × 10^(-3) M_☉^(-1) yr^(-1) Mpc^(-3), showing for the first time that the UV-bright population of massive galaxies alone contributes significantly to the global star formation rate density at z ~ 3. When combined with the star formation rate densities at z < 2, our result reveals a steady increase in the contribution of massive galaxies to the global star formation from z = 0 to z ~ 3, providing strong support to the downsizing of galaxy formation.

Item Type:Article
Related URLs:
URLURL TypeDescription Paper
Im, Myungshin0000-0002-8537-6714
Yan, Lin0000-0003-1710-9339
Storrie-Lombardi, Lisa0000-0002-5987-5210
Additional Information:© 2007 American Astronomical Society. Received 2007 January 14; Accepted 2007 August 3. We thank the FLS members for their support on this program. This work was supported by grant R01-2005-000-10610-0 from the Basic Research Program of the Korea Science and Engineering Foundation, and the University-Institute Cooperative Research Fund from the Korea Astronomy and Space Science Institute. We also acknowledge the support from the Frontier Physics Research Division of the Brain Korea 21 program at Seoul National University. We thank an anonymous referee for many useful comments.
Group:Infrared Processing and Analysis Center (IPAC)
Funding AgencyGrant Number
Korea Science and Engineering FoundationR01-2005-000-10610-0
Korea Astronomy and Space Science Institute (KASI)UNSPECIFIED
Seoul National UniversityUNSPECIFIED
Subject Keywords:cosmology: observations; galaxies: evolution; galaxies: high-redshift; galaxies: starburst; galaxies: stellar content; infrared: galaxies
Issue or Number:2
Record Number:CaltechAUTHORS:20100212-114318585
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Official Citation:Massive Lyman Break Galaxies at z ~ 3 in the Spitzer Extragalactic First Look Survey Hyunjin Shim, Myungshin Im, Phillip Choi, Lin Yan, and Lisa Storrie-Lombardi 2007 ApJ 669 749-764 doi: 10.1086/522105
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:17467
Deposited By: Jason Perez
Deposited On:12 Feb 2010 23:54
Last Modified:08 Nov 2021 23:35

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