Optical-infrared spectral energy distributions of z>2 Lyman break galaxies

被引:196
作者
Sawicki, M [1 ]
Yee, HKC [1 ]
机构
[1] Univ Toronto, Dept Astron, Toronto, ON M5S 3H8, Canada
关键词
cosmology; observations; early universe; galaxies; starburst;
D O I
10.1086/300291
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
Broadband optical and IR spectral energy distributions are determined for spectroscopically confirmed z > 2 Lyman break objects in the Hubble Deep Field (HDF). These photometric data are compared with spectral synthesis models which take into account the effects of metallicity and of internal reddening due to dust. It is found that, on average, Lyman break objects are shrouded in enough dust [typically E(B-V) approximate to 0.3] to suppress their UV fluxes by a factor of more than 10. The dust-corrected star formation rate in a typical HDF Lyman break object is similar to 60 h(100)(-2) M. yr(-1) (q(0) = 0.5). Furthermore, these objects are dominated by very young (less than or similar to 0.2 Gyr, and a median of similar to 25 Myr) stellar populations, suggesting that star formation at high redshift is episodic rather than continuous. Typically, these star formation episodes produce similar to 10(9) h(100)(-2) M. of stars, or similar to 1/20 of the stellar mass of a present-day L* galaxy.
引用
收藏
页码:1329 / 1339
页数:11
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