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NuSTAR discovery of a cyclotron absorption line in the transient X-ray pulsar 2S 1553-542
Sergey S. Tsygankov, Alexander A. Lutovinov, Roman A. Krivonos +4
We report results of a spectral and timing analysis of the poorly studied transient X-ray pulsar 2S 1553-542 using data collected with the NuSTAR and Chandra observatories and the…
Chandra Observations of Eight Sources Discovered by INTEGRAL
John A. Tomsick, Roman Krivonos, Qinan Wang +5
We report on 0.3-10 keV observations with the Chandra X-ray Observatory of eight hard X-ray sources discovered within 8 degrees of the Galactic plane by the INTEGRAL satellite. The…
NuSTAR Hard X-ray Survey of the Galactic Center Region I: Hard X-ray Morphology and Spectroscopy of the Diffuse Emission
Kaya Mori, Charles J. Hailey, Roman Krivonos +35
We present the first sub-arcminute images of the Galactic Center above 10 keV, obtained with NuSTAR. NuSTAR resolves the hard X-ray source IGR J17456-2901 into non-thermal X-ray fi…
Does the obscured AGN fraction really depend on luminosity?
Sergey Sazonov, Eugene Churazov, Roman Krivonos
We use a sample of 151 local non-blazar AGN selected from the INTEGRAL all-sky hard X-ray survey to investigate if the observed declining trend of the fraction of obscured (i.e. sh…
Multi-wavelength Observations of the Binary System PSR B1259-63/LS~2883 around the 2014 Periastron Passage
M. Chernyakova, A. Neronov, B. van Soelen +16
We report on the results of the extensive multi-wavelength campaign from optical to GeV gamma-rays of the 2014 periastron passage of PSR B1259-63, which is a unique high-mass gamma…
NuSTAR discovery of an unusually steady long-term spin-up of the Be binary 2RXP J130159.6-635806
Roman A. Krivonos, Sergey S. Tsygankov, Alexander A. Lutovinov +14
We present spectral and timing analysis of NuSTAR observations of the accreting X-ray pulsar 2RXP J130159.6-635806. The source was serendipitously observed during a campaign focuse…