Discovery of a Color-Selected Quasar at z=5.50

Details Discovery of a Color-Selected Quasar at z=5.50 Discovery of a Color-Selected Quasar at z=5.50

2000-02-17

arxiv.org/abs/astro-ph/0002338v1

Astrophys.J. 533 (2000) L75-L78

Astronomy and Astrophysics

Astrophysics

9 pages, 2 figures; to appear in the The Astrophysical Journal Letters

Scientific paper

10.1086/312614

We present observations of RD J030117+002025, a quasar at z=5.50 discovered from deep, multi-color, ground-based observations covering 74 square arcmin. This is the most distant quasar or AGN currently known. The object was targeted as an R-band dropout, with R(AB)>26.3 (3-sigma limit in a 3 arcsec diameter region), I(AB)=23.8, and z(AB)=23.4. The Keck/LRIS spectrum shows broad Lyman-alpha/NV emission and sharp absorption decrements from the highly-redshifted hydrogen forests. The fractional continuum depression due to the Lyman-alpha forest is D(A)=0.90. RD J030117+002025 is the least luminous, high-redshift quasar known (M(B)~-22.7).

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