A. M. Bykov, A. M. Krassilchtchikov, Yu. A. Uvarov
Ioffe Physico-Technical Institute, Politekhnicheskaya 26,
194021 Saint-Petersburg, Russia
We discuss Chandra, XMM-Newton and INTEGRAL observations of highly obscured hard X-ray sources and their possible identifications. Theoretical models of compact accreting objects and supernova activity are discussed as the possible origins of the sources.
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