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          Institute: MPI für Astronomie     Collection: Publikationen_mpia     Display Documents

ID: 559250.0, MPI für Astronomie / Publikationen_mpia
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
Authors:Holden, B. P.; van der Wel, A.; Kelson, D. D.; Franx, M.; Illingworth, G. D.
Date of Publication (YYYY-MM-DD):2010
Title of Journal:The Astrophysical Journal
Journal Abbrev.:ApJ
Issue / Number:1
Start Page:714
End Page:729
Review Status:Peer-review
Audience:Experts Only
Abstract / Description: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 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-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 Δlog10 M/LB = -0.50 ± 0.03 between z = 0.83 and z = 0.02 or dlog10 M/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-1 to z sstarf = 1.7+0.3 -0.2 at σ = 160 km s-1 and implies that the initial mass function similarly varies slowly with galaxy mass. Based on observations with the NASA/ESA Hubble Space Telescope, obtained at the Space Telescope Science Institute, which is operated by the Association of Universities for Research in Astronomy, Inc. under NASA contract No. NAS5-26555. These observations are associated with programs nos. 9290, 9772, and 9919. This paper includes data gathered with the 6.5 m Magellan Telescopes located at Las Campanas Observatory, Chile.
Free Keywords:galaxies: clusters: general; galaxies: clusters: individual: EMSS 1054.4-0321; galaxies: elliptical and lenticular; cD; galaxies: evolution; galaxies: fundamental parameters; galaxies: photometry
External Publication Status:published
Document Type:Article
Communicated by:N. N.
Affiliations:MPI für Astronomie
Identifiers:URL:http://adsabs.harvard.edu/abs/2010ApJ...724..714H [ID No:1]
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