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Discovery of a close pair of z = 4.25 quasars from the Sloan Digital Sky Survey

Collaboration
•
Aug, 2000
15 pages
Published in:
  • Astron.J. 120 (2000) 2183
e-Print:
DOI:
Report number:
  • FERMILAB-PUB-00-357-A
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Abstract: (arXiv)
We report the discovery of a pair of z = 4.25 quasars with a separation of 33 arcseconds. The brighter of the two objects was identified as a high-redshift quasar candidate from Sloan Digital Sky Survey multicolor imaging data, and the redshift was measured from a spectrum obtained with the Hobby-Eberly Telescope. The slit orientation of this observation {\it by chance} included another quasar, approximately one magnitude fainter and having the same redshift as the target. This is the third serendipitous discovery of a z > 4 quasar. The differences in the relative strengths and profiles of the emission lines suggest that this is a quasar pair and not a gravitational lens. The two objects are likely to be physically associated: the projected physical separation is approximately 210 h50−1h_{50}^{-1} kpc and the redshifts are identical to ≈\approx 0.01, implying a radial physical separation of 950 h50−1h_{50}^{-1} kpc or less. The existence of this pair is strong circumstantial evidence that z∼4z \sim 4 quasars are clustered.
Note:
  • 15 pages, 4 figures, submitted to AJ Journal-ref: AJ, 120:2183-2189, 2000 November