TY - JOUR
T1 - The search for galaxy clustering around a quasar pair at z = 4.25 found in the sloan digital sky survey
AU - Fukugita, Masataka
AU - Nakamura, Osamu
AU - Schneider, Donald P.
AU - Doi, Mamoru
AU - Kashikawa, Nobunari
N1 - Funding Information:
We would like to thank Youichi Ohyama for his very efficient help with our observations at the Subaru Telescope. M. F. is also grateful to Richard Ellis and the Astronomy Group of Caltech for their hospitality while this article was being completed. M. F. is supported in part by a Grant in Aid of the Ministry of Education (15204011) and D. P. S. by the NSF grant AST 03-007582.
PY - 2004/3/10
Y1 - 2004/3/10
N2 - 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.
AB - 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.
KW - Large-scale structure of universe
KW - Quasars: individual
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U2 - 10.1086/383222
DO - 10.1086/383222
M3 - Article
AN - SCOPUS:2142713909
VL - 603
SP - L365-L68
JO - Astrophysical Journal
JF - Astrophysical Journal
SN - 0004-637X
IS - 2 II
ER -