Stellar masses of luminous compact blue galaxies at redshifts z=0.4-1.2

被引:35
作者
Guzmán, R
Östlin, G
Kunth, D
Bershady, MA
Koo, DC
Pahre, MA
机构
[1] Univ Florida, Dept Astron, Bryant Space Sci Ctr 216, Gainesville, FL 32611 USA
[2] Stockholm Observ, SE-10691 Stockholm, Sweden
[3] Inst Astrophys Paris, F-75014 Paris, France
[4] Univ Wisconsin, Dept Astron, Madison, WI 53706 USA
[5] Univ Calif Santa Cruz, Univ Calif Observ, Lick Observ, Dept Astron & Astrophys, Santa Cruz, CA 95064 USA
[6] Harvard Smithsonian Ctr Astrophys, Cambridge, MA 02138 USA
基金
美国国家航空航天局;
关键词
galaxies : evolution; galaxies : fundamental parameters; galaxies : photometry; galaxies : starburst; galaxies : stellar content;
D O I
10.1086/374611
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
We present stellar mass measurements for a sample of 36 luminous compact blue galaxies (LCBGs) at redshifts z = 0.4-1.2 in the flanking fields around the Hubble Deep Field-North. The technique is based on fitting a two-component galaxy population model to multi-broadband photometry. Best-fit models are found to be largely independent of the assumed values for the initial mass function (IMF) and the metallicity of the stellar populations, but they are sensitive to the amount of extinction and the extinction law adopted. On average, the best-fit model corresponds to a LMC extinction law with E(B-V) = 0.5. Stellar mass estimates, however, are remarkably independent of the final model choice. Using a Salpeter IMF, the derived median stellar mass for this sample is 5 x 10(9) M(.), i.e., similar to2 times smaller than previous virial mass estimates. Despite uncertainties of a factor of 2-3, our results strengthen prior claims that L* CBGs at intermediate redshifts are, on average, about 10 times less massive than a typical L* galaxy today.
引用
收藏
页码:L45 / L48
页数:4
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