Rest-frame optical and far-infrared observations of extremely bright Lyman-break galaxy candidates at z ∼ 2.5

被引:7
作者
Ivison, RJ
Smail, I
Bentz, M
Stevens, JA
Menéndez-Delmestre, K
Chapman, SC
Blain, AW
机构
[1] Royal Observ, UK Astron Technol Ctr, Edinburgh EH9 3HJ, Midlothian, Scotland
[2] Univ Edinburgh, Inst Astron, Edinburgh EH9 3HJ, Midlothian, Scotland
[3] Univ Durham, Inst Computat Cosmol, Durham DH1 3LE, England
[4] Ohio State Univ, Dept Astron, Columbus, OH 43210 USA
[5] Univ Hertfordshire, Ctr Astrophys Res, Sci & Technol Res Ctr, Hatfield AL10 9AB, Herts, England
[6] CALTECH, Dept Astron, Pasadena, CA 91125 USA
关键词
galaxies : active; galaxies : evolution; galaxies : formation; quasars : general;
D O I
10.1111/j.1365-2966.2005.09316.x
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
We have investigated the rest-frame optical and far-infrared properties of a sample of extremely bright candidate Lyman-break galaxies (LBGs) identified in the Sloan Digital Sky Survey. Their high ultraviolet luminosities and lack of strong ultraviolet emission lines are suggestive of massive starbursts, although it is possible that they are more typical luminosity LBGs which have been highly magnified by strong gravitational lensing. Alternatively, they may be an unusual class of weak-lined quasars. If the ultraviolet and submillimetre (submm) properties of these objects mirror those of less luminous, starburst LBGs, then they should have detectable rest-frame far-infrared emission. However, our submm photometry fails to detect such emission, indicating that these systems are not merely scaled-up (either intrinsically or as a result of lensing) examples of typical LBGs. In addition we have searched for the morphological signatures of strong lensing, using high-resolution, near-infrared imaging, but we find none. Instead, near-infrared spectroscopy reveals that these systems are, in fact, a rare class of broad absorption line quasars.
引用
收藏
页码:535 / 541
页数:7
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