Spitzer and Hubble Space Telescope constraints on the physical properties of the z∼7 galaxy strongly lensed by A2218

被引：103

作者：

Egami, E

Kneib, JP

Rieke, GH

Ellis, RS

Richard, J

Rigby, J

Papovich, C

Stark, D

Santos, MR

Huang, JS

Dole, H

Le Floc'h, E

Pérez-González, PG

机构：

[1] Univ Arizona, Steward Observ, Tucson, AZ 85721 USA

[2] Observ Midi Pyrenees, F-31000 Toulouse, France

[3] CALTECH, Dept Astron, Pasadena, CA 91125 USA

[4] Univ Cambridge, Inst Astron, Cambridge CB3 0HA, England

[5] Harvard Smithsonian Ctr Astrophys, Cambridge, MA 02138 USA

来源：

ASTROPHYSICAL JOURNAL | 2005年 / 618卷 / 01期

关键词：

cosmology : observations; galaxies : evolution; galaxies : formation; galaxies : high-redshift; gravitational lensing;

D O I：

10.1086/427550

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We report the detection of a z similar to 7 galaxy strongly lensed by the massive galaxy cluster A2218 (z = 0.175) at 3.6 and 4.5 mum using the Spitzer Space Telescope and at 1.1 mum using the Hubble Space Telescope. The new data indicate a refined photometric redshift in the range of 6.6-6.8 depending on the presence of Lyalpha emission. The spectral energy distribution is consistent with having a significant Balmer break, suggesting that the galaxy is in the poststarburst stage with an age of at least similar to50 Myr and quite possibly a few hundred million years. This suggests the possibility that a mature stellar population is already in place at such a high redshift. Compared with typical Lyman break galaxies at, the stellar mass is an order of magnitude smaller (similar to10(9) M-circle dot), but the specific star formation rate (star formation rate/M-star) is similarly large (>10(-9) yr(-1)), indicating equally vigorous star-forming activity.

引用

页码：L5 / L8

页数：4

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