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MODELLING OF SPECTRA OF GRB HOST GALAXIES

A. Moskvitin, E.Sonbas

The method of estimation of internal extinction, mass and age of host
galaxies is demonstrated for three galaxies: GRB 980703, GRB 000210 and
GRB 060218. The method of two-component modeling was applied: the theoretical
spectrum is the sum of the spectrum of the burst component and the spectrum
of the old stellar population which determines the galaxy age. Different
laws of internal extinction in host galaxies were used when modeling. The
MW law turned out to be the most suitable for the GRB 980703 host galaxy.
In other galaxies the internal extinction turned out to be low. Thus, only
from data of wide-band photometry it is possible to obtain estimations of
physical parameters and probable spectral energy distributions of GRB host
galaxies. The study of spectral properties of host galaxies allows us to
determine the nature of GRB source progenitors.