Discovery of a color-selected quasar at z=5.50

被引:48
作者
Stern, D
Spinrad, H
Eisenhardt, P
Bunker, AJ
Dawson, S
Stanford, SA
Elston, R
机构
[1] CALTECH, Jet Prop Lab, Pasadena, CA 91109 USA
[2] Univ Calif Berkeley, Dept Astron, Berkeley, CA 94720 USA
[3] Inst Astron, Cambridge CB3 0HA, England
[4] Univ Calif Davis, Dept Phys, Davis, CA 95616 USA
[5] Univ Calif Lawrence Livermore Natl Lab, Davis, CA 95616 USA
[6] Univ Florida, Dept Astron, Gainesville, FL 32611 USA
基金
美国国家科学基金会;
关键词
early universe; quasars : general; quasars : individual (RD J030117+002025);
D O I
10.1086/312614
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
We present observations of RD J030117+002025, a quasar at z = 5.50 discovered from deep, multicolor, ground-based observations covering 74 arcmin(2). This is the most distant quasar or active galaxy currently known. The object was targeted as an R-band dropout, with R-AB > 26.3 (3 sigma limit in a 3 " diameter region), I-AB = 23.8, and z(AB) = 23.4. The Kecknow-Resolution Imaging Spectrometer spectrum shows broad Ly alpha/N v lambda 1240 emission and sharp absorption decrements from the highly redshifted hydrogen forests. The fractional continuum depression due to the Ly alpha forest is D-A = 0.90. RD J030117+002025 is the least luminous high-redshift quasar known (M-B approximate to -22.7).
引用
收藏
页码:L75 / L78
页数:4
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