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

来源：

ASTROPHYSICAL JOURNAL | 2000年 / 533卷 / 02期

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

页码：L75 / L78

页数：4

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