FIRST RESULTS FROM THE VIRIAL SURVEY: THE STELLAR CONTENT OF UVJ-SELECTED QUIESCENT GALAXIES AT 1.5 < z < 2 FROM KMOS

被引：38
|
作者：
Mendel, J. Trevor [1 ,2 ]
Saglia, Roberto P. [1 ,2 ]
Bender, Ralf [1 ,2 ]
Beifiori, Alessandra [1 ,2 ]
Chan, Jeffrey [1 ,2 ]
Fossati, Matteo [1 ,2 ]
Wilman, David J. [1 ,2 ]
Bandara, Kaushala [1 ]
Brammer, Gabriel B. [3 ]
Schreiber, Natascha M. Foerster [1 ]
Galametz, Audrey [1 ,2 ]
Kulkarni, Sandesh [1 ,2 ]
Momcheva, Ivelina G. [4 ]
Nelson, Erica J. [4 ]
van Dokkum, Pieter G. [4 ]
Whitaker, Katherine E. [5 ]
Wuyts, Stijn [1 ]
机构：
[1] Max Planck Inst Extraterr Phys, D-85748 Garching, Germany
[2] Univ Sternwarte Munchen, D-81679 Munich, Germany
[3] Space Telescope Sci Inst, Baltimore, MD 21218 USA
[4] Yale Univ, Dept Astron, New Haven, CT 06511 USA
[5] NASA, Goddard Space Flight Ctr, Astrophys Sci Div, Greenbelt, MD 20771 USA
来源：
ASTROPHYSICAL JOURNAL LETTERS | 2015年 / 804卷 / 01期
关键词：
galaxies: evolution; galaxies: formation; galaxies: high-redshift; ABSORPTION-LINE SPECTROSCOPY; EXTRAGALACTIC LEGACY SURVEY; STAR-FORMING GALAXIES; INITIAL MASS FUNCTION; PHOTOMETRIC CATALOGS; SIZE GROWTH; EVOLUTION; POPULATIONS; SEQUENCE; SPECTRA;
D O I：
10.1088/2041-8205/804/1/L4
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
We investigate the stellar populations of 25 massive galaxies (log[ M-*/M-circle dot] >= 10.9) at 1.5<z<2 using data obtained with the K-band Multi-Object Spectrograph (KMOS) on the ESO VLT. Targets were selected to be quiescent based on their broadband colors and redshifts using data from the 3D-HST grism survey. The mean redshift of our sample is (z) over bar = 1.75, where KMOS YJ-band data probe age-and metallicity-sensitive absorption features in the rest-frame optical, including the G-band, Fe I, and high-order Balmer lines. Fitting simple stellar population models to a stack of our KMOS spectra, we derive a mean age of 1.03(-0.08)(+0.13) Gyr. We confirm previous results suggesting a correlation between color and age for quiescent galaxies, finding mean ages of 1.22(-0.19)(+0.56) Gyr and 0.85(-0.05)(+0.08)Gyr for the reddest and bluest galaxies in our sample. Combining our KMOS measurements with those obtained from previous studies at 0.2<z<2 we find evidence for a 2-3 Gyr spread in the formation epoch of massive galaxies. At z < 1 the measured stellar ages are consistent with passive evolution, while at 1<z less than or similar to 2 they appear to saturate at similar to 1 Gyr, which likely reflects changing demographics of the (mean) progenitor population. By comparing to star formation histories inferred for "normal" star-forming galaxies, we show that the timescales required to form massive galaxies at z greater than or similar to 1.5 are consistent with the enhanced alpha-element abundances found in massive local early-type galaxies.
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页数：6
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