Morphologies of two massive old galaxies at z ∼ 2.5

被引：46

作者：

Stockton, Alan ^{[1
]}

McGrath, Elizabeth ^{[1
]}

Canalizo, Gabriela ^{[2
]}

Iye, Masanori ^{[3
]}

Maihara, Toshinori ^{[4
]}

机构：

[1] Univ Hawaii, Inst Astron, Honolulu, HI 96822 USA

[2] Univ Calif Riverside, Dept Phys & Astron, Riverside, CA 95521 USA

[3] Natl Astron Observ Japan, Opt & Infrared Astron Div, Mitaka, Tokyo 1818588, Japan

[4] Kyoto Univ, Dept Astron, Sakyo Ku, Kyoto 6068502, Japan

来源：

ASTROPHYSICAL JOURNAL | 2008年 / 672卷 / 01期

关键词：

galaxies : evolution; galaxies : high-redshift; galaxies : interactions; galaxies : structure;

D O I：

10.1086/523789

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We present the results of NICMOS imaging of two massive galaxies photometrically selected to have old stellar populations at z similar to 2.5. Both galaxies are dominated by apparent disks of old stars, although one of them also has a small bulge comprising about one-third of the light at rest-frame 4800 angstrom. The presence of massive disks of old stars at high redshift means that at least some massive galaxies in the early universe have formed directly from the dissipative collapse of a large mass of gas. The stars formed in disks like these may have made significant contributions to the stellar populations of massive spheroids at the present epoch.

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页码：146 / 152

页数：7

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