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29 March 2024
 
  » arxiv » astro-ph/0005247

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Five High-Redshift Quasars Discovered in Commissioning Imaging Data of the Sloan Digital Sky Survey
W. Zheng ; Z. I. Tsvetanov ; D. P. Schneider ; X. Fan ; R. H. Becker ; M. Davis ; R. L. White ; M. A. Strauss ; J. Annis ; N. A. Bahcall ; A. J. Connolly ; I. Csabai ; A. F. Davidsen ; M. Fukugita ; J. E. Gunn ; T. M. Heckman ; G. S. Hennessy ; Z. Ivezic ; G. R. Knapp ; E. Peng ; A. S. Szalay ; A. R. Thakar ; B. Yanny ; D. G. York ;
Date 11 May 2000
Journal Astron.J. 120 (2000) 1607
Subject astro-ph
AbstractWe report the discovery of five quasars with redshifts of 4.67 - 5.27 and z’-band magnitudes of 19.5-20.7 M_B ~ -27. All were originally selected as distant quasar candidates in optical/near-infrared photometry from the Sloan Digital Sky Survey (SDSS), and most were confirmed as probable high-redshift quasars by supplementing the SDSS data with J and K measurements. The quasars possess strong, broad Lyman-alpha emission lines, with the characteristic sharp cutoff on the blue side produced by Lyman-alpha forest absorption. Three quasars contain strong, broad absorption features, and one of them exhibits very strong N V emission. The amount of absorption produced by the Lyman-alpha forest increases toward higher redshift, and that in the z=5.27 object (D_A ~ 0.7) is consistent with a smooth extrapolation of the absorption seen in lower redshift quasars. The high luminosity of these objects relative to most other known objects at z >~ 5 makes them potentially valuable as probes of early quasar properties and of the intervening intergalactic medium.
Source arXiv, astro-ph/0005247
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