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On timing and spectral characteristics of the X-ray pulsar 4U 0115+63: Evolution of the pulsation period and the cyclotron line energy

Tsygankov, S. S.; Lutovinov, A. A.; Boldin, P. A.

An overview of the results of observations for the transient X-ray pulsar 4U 0115+63, amember of a binary system with a Be star, since its discovery to the present day (∼40 years) based on data from more than dozen observatories and instruments is presented. An overall light curve and the history of change in the spin frequency of the neutron star…

Identification of four X-ray sources from the INTEGRAL and Swift catalogs

Tsygankov, S. S.; Lutovinov, A. A.; Eselevich, M. V. +5 more

Four hard X-ray sources from the INTEGRAL and Swift catalogs have been identified. X-ray and optical spectra have been obtained for each of the objects being studied by using data from the INTEGRAL, Swift, ROSAT, and Chandra X-ray observatories as well as observations with the RTT-150 and AZT-33IK optical telescopes. Two sources (SWIFT J1553.6+260…

Second outburst of the black hole candidate MAXI J1836-194 from SWIFT and INTEGRAL observations

Sunyaev, R. A.; Grebenev, S. A.; Prosvetov, A. V.

Details of the observations of a new (second) outburst of the X-ray transientMAXI J1836-194 discovered late in August 2011, a suspected black hole in a low-mass binary system, with the instruments of the SWIFT and INTEGRAL orbiting observatories are presented. The outburst was weaker than the first one; the source had a power-law spectrum in a wid…

Outburst of the unknown source IGR J18175-2419 detected by the INTEGRAL observatory: Yet another fast X-ray transient?

Grebenev, S. A.

The discovery of a new X-ray source, IGR J18175-2419, that flared up for a short (∼1 h) time on September 26, 2012, by the INTEGRAL observatory is reported. The results of the source's localization and the spectral/timing analysis of its X-ray emission are presented. The source may turn out to be yet another representative of the population of fas…