SIMBAD references

2010ApJ...724..714H - Astrophys. J., 724, 714-729 (2010/November-3)

M/LB and color evolution for a deep sample of M* cluster galaxies at z ∼ 1: the formation epoch and the tilt of the fundamental plane.


Abstract (from CDS):

We have measured velocity dispersions (σ) for a sample of 36 galaxies with J < 21.2 or Mr< -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 δ(σ) ∼ 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 {sstarf} galaxy at z ∼ 1, unlike most previous z ∼ 1 cluster samples which are complete only for the massive cluster members (>1011 M). 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-σ relation and M/LB-σ relations; measuring evolution at a fixed σ should minimize the impact of structural evolution found in other work. The M/LB at fixed σ evolves by Δlog10M/LB = -0.50±0.03 between z = 0.83 and z = 0.02 or dlog10M/LB= -0.60 ± 0.04 dz, and we find Δ(U - V)z= -0.24±0.02 mag at fixed σ in the rest frame, matching the expected evolution in M/LB within 2.25 standard deviations. The implied formation redshift from both the color and M/LB evolution is z{sstarf}= 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{sstarf} 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-σ and color-σ relations imply that the formation epoch depends weakly on mass, ranging from z{sstarf}= 2.3+1.3–0.3 at σ = 300 km/s to z{sstarf}= 1.7+0.3–0.2 at σ = 160 km/s and implies that the initial mass function similarly varies slowly with galaxy mass.

Abstract Copyright:

Journal keyword(s): galaxies: clusters: general - galaxies: clusters: individual: EMSS 1054.4-0321 - galaxies: elliptical and lenticular, cD - galaxies: evolution - galaxies: fundamental parameters - galaxies: photometry

VizieR on-line data: <Available at CDS (J/ApJ/724/714): tablea1.dat tablea2.dat>

Status at CDS : All or part of tables of objects will not be ingested in SIMBAD.

Simbad objects: 106

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