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 Cl 0152 - 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 that 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 R similar to 500 Mpc of the cluster center, which is highly suggestive of an intracluster medium interaction. We derive star formation rates from [ O II] lambda 3727 line fluxes and use these to compare the global star formation rate of Cl 0152 - 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 are 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 and 0.8.

The transformation of cluster galaxies at intermediate redshift

ROSATI, Piero;
2005

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 Cl 0152 - 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 that 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 R similar to 500 Mpc of the cluster center, which is highly suggestive of an intracluster medium interaction. We derive star formation rates from [ O II] lambda 3727 line fluxes and use these to compare the global star formation rate of Cl 0152 - 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 are 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 and 0.8.
2005
Homeier, Nl; Demarco, R; Rosati, Piero; Postman, M; Blakeslee, Jp; Bouwens, Rj; Bradley, Ld; Ford, Hc; Goto, T; Gronwall, C; Holden, B; Jee, Mj; Martel, Ar; Mei, S; Menanteau, F; Zirm, A; Clampin, M; Hartig, Gf; Illingworth, Gd; Ardila, Dr; Bartko, F; Benitez, N; Broadhurst, Tj; Brown, Ra; Burrows, Cj; Cheng, Es; Cross, Njg; Feldman, Pd; Franx, M; Golimowski, Da; Infante, L; Kimble, Ra; Krist, Je; Lesser, Mp; Meurer, Gr; Miley, Gk; Motta, V; Sirianni, M; Sparks, Wb; Tran, Hd; Tsvetanov, Zi; White, Rl; Zheng, W.
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11392/1853989
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