http://arxiv.org/abs/1805.07082
We study the clustering of field galaxies in the GRB021004 line of sight. The first signature is the GRB021004 field photometric redshifts distribution based on observations gathered at the 6-m telescope of the Special Astrophysical Observatory of the Russian Academy of Sciences, from which we infer a peak near z=0.56 estimated from multicolor photometry in the GRB direction. The second signature is the Mg II?? 2796, 2803 AA 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 square degrees) area around GRB021004 with an effective peak near z=0.56 obtained 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. Using the data from the catalogs, the size of the whole inhomogeneity in distribution of the galaxy cluster with the peak near z=0.56 is also estimated as about 6-8 degrees or 140-190 Mpc. A possibility of inhomogeneity (a galaxy cluster) near the GRB021004 direction can be also confirmed by an inhomogeneity in the cosmic microwave background related with the Sunyaev-Zeldovich effect.
I. Sokolov, O. Zhelenkova, I. Solovyev, et. al.
Mon, 21 May 18
57/71
Comments: 23 pages, 13 figures
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