Browsing Faculty of Natural and Agricultural Sciences by Subject "Black hole physics"
Now showing items 1-8 of 8
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Authenticating the presence of a relativistic massive black hole binary in OJ 287 using its general relativity centenary flare: improved orbital parameters
(IOP Publishing, 2018)Results from regular monitoring of relativistic compact binaries like PSR 1913+16 are consistent with the dominant (quadrupole) order emission of gravitational waves (GWs). We show that observations associated with the ... -
Broad-band reflection spectroscopy of MAXI J1535-571 using AstroSat: estimation of black hole mass and spin
(Oxford Univ Press, 2019)We report the results from AstroSat observations of the transient Galactic black hole X-ray binary MAXI J1535–571 during its hard-intermediate state of the 2017 outburst. We systematically study the individual and joint ... -
A cosmic collider: was the IceCube neutrino generated in a precessing jet-jet interaction in TXS 0506+056?
(EDP Sciences, 2019)Context. The neutrino event IceCube−170922A appears to originate from the BL Lac object TXS 0506+056. To understand the neutrino creation process and to localize the emission site, we studied the radio images of the jet ... -
Extensive broadband X-ray monitoring during the formation of a giant radio jet base in Cyg X-3 with AstroSat
(IOP Publishing, 2018)We present X-ray spectral and timing behavior of Cyg X-3 as observed by AstroSat during the onset of a giant radio flare on 2017 April 1–2. Within a timescale of a few hours, the source shows a transition from the hypersoft ... -
H.E.S.S. observations of the globular clusters NGC 6388 and M15 and search for a dark matter signal
(IOP Publishing, 2011)Observations of the globular clusters (GCs) NGC 6388 and M15 were carried out by the High Energy Stereoscopic System array of Cherenkov telescopes for a live time of 27.2 and 15.2 hr, respectively. No gamma-ray signal is ... -
IceCube neutrino generated in a jet-jet collision in TXS 0506+056?
(Fabrizio Serra, 2020)The IceCube event IceCube-170922A appears to originate from the BL Lac object TXS 0506+056. Despite many other BL Lac objects showing similar properties as TXS 0506+056, such as multiwavelength variability or a curved ... -
Possible accretion disk origin of the emission variability of a blazar jet
(IOP Publishing, 2018)We analyze X-ray light curves of the blazar Mrk 421 obtained from the Soft X-ray Imaging Telescope (SXT) and the Large Area X-ray Proportional Counter (LAXPC) instrument on board the Indian space telescope AstroSat and ... -
Re-awakening of GRS 1716-249 after 23 yr, observed by Swift/XRT and NuSTAR
(Oxford Univ Press, 2019)In this work, we present a spectral and temporal analysis of Swift/XRT and NuSTAR observations of GRS 1716–249 during its recent 2016–2017 outburst. This low-mass X-ray binary underwent an extraordinary outburst after a ...