The Galaxy Luminosity Functions down to M~-10 in the Hydra I Cluster

Details The Galaxy Luminosity Functions down to M~-10 in the Hydra I Cluster The Galaxy Luminosity Functions down to M~-10 in the Hydra I Cluster

2007-01-24

arxiv.org/abs/astro-ph/0701670v1

Astron.J.134:56-63,2007

Astronomy and Astrophysics

Astrophysics

21 pages, 6 figures, submitted to AJ

Scientific paper

10.1086/518475

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 -20-14) 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.

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