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Date and Time of the Query: 2019-05-20 T00:32:55 PDT
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For refcode 2010ApJ...724..714H:
Retrieve 103 NED objects in this reference.
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Copyright by American Astronomical Society. Reproduced by permission
2010ApJ...724..714H M/L_B_ and Color Evolution for a Deep Sample of M ^*^ Cluster Galaxies at z ~ 1: The Formation Epoch and the Tilt of the Fundamental Plane Holden, B. P.; van der Wel, A.; Kelson, D. D.; Franx, M.; Illingworth, G. D. Abstract. We have measured velocity dispersions ({sigma}) for a sample of 36 galaxies with J < 21.2 or M_r_ < --20.6 mag in MS 1054-03, a massive cluster of galaxies at z = 0.83. Our data are of uniformly high quality down to our selection limit, our 16 hr exposures typically yielding errors of only {delta}({sigma}) ~ 10% for L* and fainter galaxies. By combining our measurements with data from the literature, we have 53 cluster galaxies with measured dispersions, and HST/ACS-derived sizes, colors and surface brightness. This sample is complete for the typical L ^*^ galaxy at z ~ 1, unlike most previous z ~ 1 cluster samples which are complete only for the massive cluster members (>10^11^ M_sun_). We find no evidence for a change in the tilt of the fundamental plane (FP). Nor do we find evidence for evolution in the slope of the color-{sigma} relation and M/L_B_ -{sigma} relations; measuring evolution at a fixed {sigma} should minimize the impact of structural evolution found in other work. The M/L_B_ at fixed {sigma} evolves by {DELTA}log_10_ M/L_B_ = --0.50 +/- 0.03 between z = 0.83 and z = 0.02 or dlog_10_ M/L_B_ = --0.60 +/- 0.04 dz, and we find {DELTA}(U -- V)_ z_ = --0.24 +/- 0.02 mag at fixed {sigma} in the rest frame, matching the expected evolution in M/L_B_ within 2.25 standard deviations. The implied formation redshift from both the color and M/L_B_ evolution is z_*_ = 2.0 +/- 0.2 +/- 0.3(sys), during the epoch in which the cosmic star formation activity peaked, with the systematic uncertainty showing the dependence of z_*_ on the assumptions we make about the stellar populations. The lack of evolution in either the tilt of the FP or in the M/L-{sigma} and color-{sigma} relations imply that the formation epoch depends weakly on mass, ranging from z_*_ = 2.3^+1.3^_--0.3_ at {sigma} = 300 km s^-1^ to z_*_ = 1.7^+0.3^_--0.2_ at {sigma} = 160 km s^-1^ and implies that the initial mass function similarly varies slowly with galaxy mass. Key words: galaxies: clusters: general, galaxies: clusters: individual: EMSS 1054.4-0321, galaxies: elliptical and lenticular, cD, galaxies: evolution, galaxies: fundamental parameters, galaxies: photometry
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