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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 | Abstract: | We 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 | Services: | Forum | Review | PDF | Favorites |
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