The galaxy luminosity functions down to M∼-10 in the Hydra I cluster

被引：10
|
作者：
Yamanoi, Hitomi [1 ]
Tanaka, Masayuki
Hamabe, Masaru
Yagi, Masafumi
Okamura, Sadanori
Iye, Masanori
Shimasaku, Kazuhiro
Doi, Mamoru
Komiyama, Yutaka
Furusawa, Hisanori
机构：
[1] Grad Univ Adv Studies Sokendai, Dept Astron Sci, Sch Phys Sci, Natl Astron Observ, Tokyo 1818588, Japan
[2] Univ Tokyo, Dept Astron, Sch Sci, Tokyo 1130033, Japan
[3] Japan Womens Univ, Dept Math & Phys Sci, Sch Sci, Bunkyo Ku, Tokyo 1128681, Japan
[4] Natl Astron Observ, Opt & Infrared Astron Div, Tokyo 1818588, Japan
[5] Univ Tokyo, Res Ctr Early Universe, Sch Sci, Bunkyo Ku, Tokyo 1130033, Japan
[6] Univ Tokyo, Inst Astron, Tokyo 1810015, Japan
[7] Natl Astron Observ Japan, Subaru Telescope, Hilo, HI 96720 USA
来源：
ASTRONOMICAL JOURNAL | 2007年 / 134卷 / 01期
关键词：
galaxies : clusters : individual (Hydra I); galaxies : dwarf; galaxies : luminosity function; mass function;
D O I：
10.1086/518475
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
We study the galaxy population of the Hydra I cluster in the central region and a region about 0.6 Mpc away from its center in the B and RC bands down to M similar to -10 using Subaru Suprime-Cam photometry. We find that the luminosity function of the entire population has a slightly steeper slope (alpha similar to -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 in bright galaxies. The Hydra I cluster is dominated by red dwarfs, and the luminosity function shows a significant upturn at M similar to -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.
引用
收藏
页码：56 / 63
页数：8
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