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The Galaxy Luminosity Functions down to M~-10 in the Hydra I Cluster | | H. Yamanoi
; M. Tanaka
; M. Hamabe
; M. Yagi
; S. Okamura
; M. Iye
; K. Shimasaku
; M. Doi
; Y. Komiyama
; H. Furusawa
; | | Date: |
24 Jan 2007 | | Abstract: | We study the galaxy population in the central region and a region about 0.6 Mpc away from the center of the Hydra I cluster in B- and Rc-bands down to M~-10 using the Subaru Suprime-Cam photometry. We find that the luminosity function of the entire population has a slightly steeper slope (alpha~-1.6) in the range of -20<M<-10 than those reported for other clusters in slightly brighter ranges. The slope appears to be steeper in poorer clusters. The number of faint galaxies (M>-14) increases in the cluster center as well as bright galaxies. The Hydra I cluster is dominated by red dwarfs and the luminosity function shows a significant upturn at M~-16 as is seen in several other nearby clusters, but not in the field. This upturn and the variation in the faint-end slope of the luminosity function may be caused by the cluster environment or the evolution history of individual clusters. | | Source: | arXiv, astro-ph/0701670 | | Services: | Forum | Review | PDF | Favorites | |
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