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Date and Time of the Query: 2019-08-22 T07:11:06 PDT
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For refcode 2007ApJ...661..750T:
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Copyright by American Astronomical Society. Reproduced by permission
2007ApJ...661..750T A Keck Spectroscopic Survey of MS 1054-03 (z = 0.83): Forming the Red Sequence Kim-Vy H. Tran, Marijn Franx, Garth D. Illingworth, Pieter van Dokkum, Daniel D. Kelson, John P. Blakeslee, and Marc Postman Abstract. Using a magnitude-limited, spectroscopic survey of the X-ray -- luminous galaxy cluster MS 1054-03, we isolate 153 cluster galaxies and measure MS 1054's redshift and velocity dispersion to be z=0.8307+/-0.0004 and {sigma}_z_=1156+/-82kms^-1^. The absorption-line, poststarburst ("E+A"), and emission-line galaxies, respectively, make up 63%+/-7%, 15%+/-4%, and 23%+/-4% of the cluster population. With photometry from HST ACS, we find that the absorption-line members define an exceptionally tight red sequence over a span of ~3.5 mag in i_775_: their intrinsic scatter in (V_606_-i_775_) color is only 0.048+/-0.008, corresponding to a (U-B)_z_ scatter of 0.041. Their color scatter is comparable to that of the ellipticals ({sigma}_Vi_=0.055+/-0.008), but measurably smaller than that of the combined E+S0 sample ({sigma}_Vi_=0.072+/-0.010). The color scatter of MS 1054's absorption-line population is approximately twice that of the ellipticals in Coma; this difference is consistent with passive evolution where most of the absorption-line members (>75%) formed by z~2, and all of them by z~1.2. For red members, we find a trend (>95% confidence) of weakening H{delta} absorption with redder colors that we conclude is due to age: in MS 1054, the color scatter on the red sequence is driven by differences in mean stellar age of up to ~1.5 Gyr. We also generate composite spectra and estimate that the average S0 in MS 1054 is ~0.5 -- 1 Gyr younger than the average elliptical; this difference in mean stellar age is mainly due to a number of S0's that are blue (18%) and/or are poststarburst systems (21%). Key words: Galaxies: Clusters: Individual: MS 1054-03, Galaxies: Elliptical and Lenticular, cD, Galaxies: Evolution, Galaxies: Fundamental Parameters
Retrieve 144 NED objects in this reference.
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