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08 February 2025
 
  » arxiv » astro-ph/0412083

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The Transformation of Cluster Galaxies at Intermeidate Redshift
N.L. Homeier ; R. Demarco ; P. Rosati ; M. Postman ; J.P. Blakeslee ; R.J. Bouwens ; L.D. Bradley ; H.C. Ford ; T. Goto ; C. Gronwall ; B. Holden ; G.D. Illingworth ; M.J. Jee ; A. R. Martel ; S. Mei ; F. Menanteau ; A. Zirm ; M. Clampin ; G. F. Hartig ; the ACS Team ;
Date 3 Dec 2004
Journal Astrophys.J. 621 (2005) 651-662
Subject astro-ph
AbstractWe combine imaging data from the Advanced Camera for Surveys (ACS) with VLT/FORS optical spectroscopy to study the properties of star-forming galaxies in the z=0.837 cluster CL0152-1357. We have morphological information for 24 star-forming cluster galaxies, which range in morphology from late-type and irregular to compact early-type galaxies. We find that while most star-forming galaxies have $r_{625}-i_{775}$ colors bluer than 1.0, eight are in the red cluster sequence. Among the star-forming cluster population we find five compact early-type galaxies which have properties consistent with their identification as progenitors of dwarf elliptical galaxies. The spatial distribution of the star-forming cluster members is nonuniform. We find none within $Rsim 500$ Mpc of the cluster center, which is highly suggestive of an intracluster medium interaction. We derive star formation rates from [OII] $lambdalambda 3727$ line fluxes, and use these to compare the global star formation rate of CL0152-1357 to other clusters at low and intermediate redshifts. We find a tentative correlation between integrated star formation rates and $T_{X}$, in the sense that hotter clusters have lower integrated star formation rates. Additional data from clusters with low X-ray temperatures is needed to confirm this trend. We do not find a significant correlation with redshift, suggesting that evolution is either weak or absent between z=0.2-0.8.
Source arXiv, astro-ph/0412083
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