The search for galaxy clustering around a quasar pair at z = 4.25 found in the sloan digital sky survey

Masataka Fukugita, Osamu Nakamura, Donald P. Schneider, Mamoru Doi, Nobunari Kashikawa

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

We present an investigation of the environment (≈600 kpc radius) of a pair of luminous z = 4.25 quasars, SDSS J1439-0034A and B, separated by 33″. An analysis of high-quality Subaru spectra of the quasars suggests that this configuration is indeed a physical pair and not a gravitational lens; the redshifts are slightly different (although marginally consistent with being the same), and the two spectra have strikingly different features. We search for bright galaxies (L ≳ 0.4L*) having similar redshifts using the V dropout technique and semi-narrowband imaging looking for strong Lyα emission. We find no enhancement in the galaxy density around the quasar pair; its environment differs very little from a general field, with the upper limit of the density enhancement being about 3.5 at a 90% confidence. We infer that bright quasars happened to appear in two normal galaxies in a general field.

Original languageEnglish
Pages (from-to)L365-L68
JournalAstrophysical Journal
Volume603
Issue number2 II
Publication statusPublished - 2004 Mar 10
Externally publishedYes

Keywords

  • Large-scale structure of universe
  • Quasars: individual

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

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