The evolution of cluster dwarfs

✍ Scribed by D. Harsono; R. De Propris

• Publisher: John Wiley and Sons
• Year: 2009
• Tongue: English
• Weight: 400 KB
• Volume: 330
• Category: Article
• ISSN: 0004-6337
• DOI: 10.1002/asna.200911269

✦ Synopsis

Abstract

We summarize the results from analyzing six clusters of galaxies at 0.14 < z < 0.40 observed with the Hubble Space Telescope Advanced Camera for Surveys. We derive deep composite luminosity functions in B, g, V, r, i, and z down to absolute magnitude of ∼ –14 + 5 log h mag. The luminosity functions are fitted by a single Schechter function with M~BgVriz~ * = –19.8, –20.9, –21.9, –22.0, –21.7, and –22.3 mag, and α ∼ –1.3 for all bands. The data suggests red sequence dominates the luminosity function down to ≥6 mag below L~*~, the dwarf spheroidals regime. Hence, at least at z 0.3, the red sequence is well established and galaxies down to dwarf spheroidals are assembled within these clusters. We do not detect the faint‐end upturn (M > –16) that is observed in lower redshift clusters. If this is real, the faint‐end population has originated since z = 0.3 (© 2009 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)