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Infall, the Butcher-Oemler Effect, and the Descendants of Blue Cluster Galaxies at z~0.6 | | Kim-Vy H. Tran
; Pieter van Dokkum
; Garth D. Illingworth
; Daniel Kelson
; Anthony Gonzalez
; Marijn Franx
; | | Date: |
28 Sep 2004 | | Journal: | Astrophys.J. 619 (2005) 134-146 | | Subject: | astro-ph | | Abstract: | Using wide-field HST/WFPC2 imaging and extensive Keck/LRIS spectroscopy, we present a detailed study of the galaxy populations in MS2053--04, a massive, X-ray luminous cluster at z=0.5866. Analysis of 149 confirmed cluster members shows that MS2053 is composed of two structures that are gravitationally bound to each other; their respective velocity dispersions are 865 km/s (113 members) and 282 km/s (36 members). MS2053’s total dynamical mass is 1.2x10^15 Msun. MS2053 is a classic Butcher-Oemler cluster with a high fraction of blue members (24%) and an even higher fraction of star-forming members (44%), as determined from their [OII] emission. The number fraction of blue/star-forming galaxies is much higher in the infalling structure than in the main cluster. This result is the most direct evidence to date that the Butcher-Oemler effect is linked to galaxy infall. In terms of their colors, luminosities, estimated internal velocity dispersions, and [OII] equivalent widths, the infalling galaxies are indistinguishable from the field population. MS2053’s deficit of S0 galaxies combined with its overabundance of blue spirals implies that many of these late-types will evolve into S0 members. The properties of the blue cluster members in both the main cluster and infalling structure indicate they will evolve into low mass, L3. | | Source: | arXiv, astro-ph/0409696 | | Services: | Forum | Review | PDF | Favorites | |
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