The Excess Density of Field Galaxies near <Emphasis Type="Italic">z</Emphasis> ~ 0.56 around the Gamma-Ray Burst GRB021004 Position |
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Authors: | I V Sokolov A J Castro-Tirado O P Zhelenkova I A Solovyev O V Verkhodanov V V Sokolov |
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Institution: | 1.Institute of Astronomy,Russian Academy of Sciences,Moscow,Russia;2.Stellar Physics Department,Institute for Astrophysics of Andalucia,Granada,Spain;3.Special Astrophysical Observatory,Russian Academy of Sciences,Nizhnii Arkhyz,Russia;4.ITMO University,St. Petersburg,Russia;5.Astronomical Department,St. Petersburg State University,St. Petersburg,Russia |
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Abstract: | We test for reliability any signatures of field galaxies clustering in the GRB021004 line of sight. The first signature is the GRB021004 field photometric redshifts distribution based on the 6-m telescope of the Special Astrophysical Observatory of the Russian Academy of Sciences observations with a peak near z ~ 0.56 estimated from multicolor photometry in the GRB direction. The second signature is the Mg II λλ2796, 2803 Å absorption doublet at z ≈ 0.56 in VLT/UVES spectra obtained for the GRB021004 afterglow. The third signature is the galaxy clustering in a larger (of about 3° × 3°) area around GRB021004 with an effective peak near z ~ 0.56 for both the spectral and photometric redshifts from a few catalogs of clusters based on the Sloan Digital Sky Survey (SDSS) and Baryon Oscillation Spectroscopic Survey (BOSS) as a part of SDSS-III. From catalog data the size of the whole inhomogeneity in distribution of the galaxy cluster with the peak near z ≈ 0.56 was also estimated as about 6°–8° or 140–190 Mpc. A possibility of inhomogeneity (a galaxy cluster) near the GRB021004 direction can be also confirmed by an inhomogeneity in cosmic microwave background related with the Sunyaev–Zeldovich effect. |
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