THE EVOLUTION OF THE SPECIFIC STAR FORMATION RATE OF MASSIVE GALAXIES TO z ∼ 1.8 IN THE EXTENDED CHANDRA DEEP FIELD SOUTH
作者： Maaike Damen , Ivo Labbé , Marijn Franx , Pieter G. van Dokkum , Edward N. Taylor
DOI: 10.1088/0004-637X/690/1/937
关键词: Luminous infrared galaxy 、 Elliptical galaxy 、 Luminosity function (astronomy) 、 Chandra Deep Field South 、 Galaxy 、 Quasar 、 Physics 、 Astrophysics 、 Star formation 、 Astronomy 、 Redshift
摘要: We study the evolution of star formation rate (SFR) mid-infrared selected galaxies in extended Chandra Deep Field South. use a combination UBVRI z'JHK GaBoDS and MUSYC data, deep Infrared Array Camera observations from SIMPLE, MIPS data FIDEL. This unique multiwavelength set allows us to investigate SFR history massive out redshift z ~ 1.8. determine SFRs using both rest-frame ultraviolet luminosity young, hot stars total infrared IR obscured obtained 24 μm flux. find that at all redshifts with higher masses have substantially lower specific (SSFRs) than lower-mass galaxies. The average SSFRs increase redshift, incline is similar for (roughly (1 + z) n , = 5.0 ± 0.4). It does not seem be strong function galaxy mass. Using subsample M * > 1011 ☉, we measured fraction whose quenched. consider quiescent mode when its SSFR exceed 1/(3 × tH ), where Hubble time. defined as such decreases that, 19% 9% ☉ sources would considered according our criterion.
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