The Galaxy Luminosity Functions down to M~-10 in the Hydra I Cluster
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.
Cite
@article{arxiv.astro-ph/0701670,
title = {The Galaxy Luminosity Functions down to M~-10 in the Hydra I Cluster},
author = {H. Yamanoi and M. Tanaka and M. Hamabe and M. Yagi and S. Okamura and M. Iye and K. Shimasaku and M. Doi and Y. Komiyama and H. Furusawa},
journal= {arXiv preprint arXiv:astro-ph/0701670},
year = {2008}
}
Comments
21 pages, 6 figures, submitted to AJ