COLOR EVOLUTION FROM Z=0 TO Z=1

被引:138
作者
RAKOS, KD [1 ]
SCHOMBERT, JM [1 ]
机构
[1] CALTECH,JET PROP LAB,CTR INFRARED PROC & ANAL,PASADENA,CA 91125
关键词
GALAXIES; EVOLUTION; PHOTOMETRY;
D O I
10.1086/175150
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
Rest frame Stromgren photometry (3500 Angstrom, 4100 Angstrom, 4750 Angstrom, and 5500 Angstrom) is presented for 509 galaxies in 17 rich clusters between z = 0 and z = 1 as a test of color evolution. Our observations confirm a strong, rest frame, Butcher-Oemler effect where the fraction of blue galaxies increases from 20% at z = 0.4 to 80% at z = 0.9. We also find that a majority of these blue cluster galaxies are composed of normal disk or post-starburst systems based on color criteria. When comparing our colors to the morphological results from HST imaging, we propose that the blue cluster galaxies are a population of late-type, low surface brightness objects which fade and are then destroyed by the cluster tidal field. After isolating the red objects from Butcher-Oemler objects, we have compared the mean color of these old, non-star-forming objects with spectral energy distribution models in the literature as a test for passive galaxy evolution in ellipticals. We find good agreement with single-burst models which predict a mean epoch of galaxy formation at z = 5. Tracing the red envelope for ellipticals places the earliest epoch of galaxy formation at z = 10.
引用
收藏
页码:47 / 59
页数:13
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