Ionization state of the interstellar medium in GRB host galaxies

E. O. Vasiliev*
Institute of Physics, Southern Federal University, Stachki Ave. 194, Rostov-on-Don, 344090, Russia

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Column densities of the highly-ionized species, C IV, N V and O VI, observed in the interstellar medium in the high redshift (z > 2) GRB host galaxies are analyzed using the non-equilibrium (time-dependent) photoionized model. It is found that the ionic ratios measured in the observations cannot be obtained with the photoionization model with super-solar metallicity. The possible ways to explain the observed ionic ratios are discussed.

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Keywords : gamma rays: bursts - ISM: general.