期刊
ASTROPHYSICAL JOURNAL
卷 533, 期 2, 页码 L75-L78出版社
UNIV CHICAGO PRESS
DOI: 10.1086/312614
关键词
early universe; quasars : general; quasars : individual (RD J030117+002025)
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).
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