Estudio de las propiedades de la vecindad de galaxias anfitrionas de ráfagas de rayos gamma

Abstract

In order to study the galactic ambient of Gamma Ray Burts (GRB) we used the S. Savaglio catalog from 2016 where 221 GRBs are listed. We choose 22 GRBs Hosts galaxies from Savaglio catalog and SDSS DR12, with a range 0<z<1, and all the objects, in a local vicinity of 10Mpc/h radius, getting 1672 in total, to determine some photometric and population characteristics. We calculate the volumetric density population of galaxies around the GRB. Hosts within a volume of an sphere whit radius of 10Mpc/h. In order to know the galaxies classification, in regions where GRBs are formed, using SDSS data we made an analysis of color index u-r, were we find a major presence of red galaxies. Furthermore, we used a inverse concentration index analysis, ici=R50/R90, in order to find a possible classification between early and late type galaxies and show that galaxies with low value of inverse concentration index domine the data. Finally we make a comparison with void and wall regions of the Universe, finding that the GRBs hosts vicinity is not similar to these regions.