An infrared emission-line galaxy at Z=2.43

被引：16
|
作者：
Beckwith, SVW
Thompson, D
Mannucci, F
Djorgovski, SG
机构：
[1] Max Planck Inst Astron, D-69117 Heidelberg, Germany
[2] CNR, Ctr Astron Infraross & Studio Mezzo Interstellare, I-50127 Florence, Italy
[3] CALTECH, Pasadena, CA 91125 USA
来源：
ASTROPHYSICAL JOURNAL | 1998年 / 504卷 / 01期
关键词：
galaxies : distances and redshifts; galaxies : individual (cK39);
D O I：
10.1086/306063
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
An object discovered during an infrared survey of the held near the quasar B2 0149 + 33 has an emission line at 2.25 mu m that we interpret as H alpha at a redshift of 2.43. The K-band image shows two compact components 10 kpc apart, surrounded by more extended emission over similar to 20 kpc. The H alpha emission appears to be extended over similar to 15 kpc (2 ") in a coarsely sampled (0." 8 pixel(-1)) image. The star formation rate may be as high as 250-1000 M. yr(-1), depending on the extinction. Alternatively, the line may be powered by an active nucleus, although the probability of serendipitously discovering an AGN in the survey volume is only similar to 0.02. The increasing number of similar objects reported in the literature indicate that they may be an important, unstudied population in the high-redshift universe.
引用
收藏
页码：107 / 112
页数：6
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