MgII statistics in GRB and QSO absorptions

Yu. A. Shchekinov1,2*, E. O. Vasiliev3 and B. B. Nath4
1Department of Space Physics, Southern Federal University, Sorge 5, Rostov on Don 344090, Russia
2Special Astrophysical Observatory RAS, Nizhny Arkhyz, Russia
3Institute of Physics, Southern Federal University, Stachki 194, Rostov on Don, Russia
4Raman Research Institute, Sadashiva Nagar, Bangalore 560080, India

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MgII absorption systems in the spectra of GRB optical afterglows show an excess with respect to QSOs incidence. Among other hypotheses, absorptions occurring in clumps inside the host interstellar medium has been recently discussed. We discuss briefly whether this scenario is consistent with the kinetics of recombinations of magnesium in the conditions expected in such absorbing clumps.

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Keywords : gamma-ray bursts: absorption lines – ionization states.