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Optical Identification of X-ray Sources from the 14-Year INTEGRAL All-Sky Survey
D. I. Karasev, A. A. Lutovinov, A. Yu. Tkachenko +6
We present the results of our optical identifications of several hard X-ray sources from the INTEGRAL all-sky survey obtained over 14 years of observations. Having improved the pos…
Broadband Spectrum of the X-ray Binary M33 X-6 from NuSTAR and Swift-XRT Data: An Extragalactic Z-Source?
S. M. Nikolaeva, R. A. Krivonos, S. Yu. Sazonov
We present the results of our study of the X-ray spectrum for the source X-6 in the nearby galaxy M33 obtained for the first time at energies above 10 keV from the data of the NuST…
NuSTAR observations of the ultraluminous X-ray source M33 X-8: a black hole in a very high state?
Roman Krivonos, Sergey Sazonov, Sergey Tsygankov +1
The closest known ultraluminous X-ray source (ULX), M33 X-8, has been recently observed with NuSTAR during its Extragalactic Legacy program, which includes a hard X-ray survey of t…
Time-Variability of equivalent width of 6.4 keV line from the Arches Complex: reflected X-rays or charged particles?
D. O. Chernyshov, C. M. Ko, R. A. Krivonos +2
Molecular gas in Arches cloud located near the Arches cluster is one of the emitters of K- line of neutral iron and X-ray continuum in the Galactic center (GC). Similarly to the…