On 2019 August 14 at 21:10:39 UTC, the LIGO/Virgo Collaboration (LVC) detected a possible neutron star-black hole merger (NSBH), the first ever identified. An...
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PublicationSOAR/Goodman Spectroscopic Assessment of Candidate Counterparts of the LIGO/Virgo Event GW190814
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PublicationSoft-state optical spectroscopy of the black hole MAXI J1305-704
The X-ray dipper MAXI J1305-704 is a dynamically confirmed black hole (BH) X-ray binary discovered a decade ago. While its only outburst has been studied in...
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PublicationSpectroscopic confirmation of the AGN nature of Swift J1933.9+3258 (=1RXS J193347.6+325422)
We report on optical spectroscopy of Swift J1933.9+3258 (=1RXS J193347.6+325422). This X-ray source has recently been classified as a likely radio-quiet AGN on...
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TalkStellar black holes at the dawn of the Universe: cosmological implications
The so called "dark ages" of the universe began about 400.000 years after the Big Bang as matter cooled down and space became filled with neutral hydrogen for...
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TalkStructure of the Kerr-Schild geometry, beam-like solutions and fluctuations of the black-hole horizon
Exact solutions of the Einstein-Maxwell equations in the Kerr-Schild formalism are discussed. We show that black hole horizon is unstable with respect to...
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PublicationSwift J1357.2-0933: a massive black hole in the Galactic thick disc
Swift J1357.2-0933 is one of the shortest orbital period black hole X-ray transients. It exhibited deep optical dips together with an extremely broad H α line...
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PublicationSwift observations of V404 Cyg during the 2015 outburst: X-ray outflows from super-Eddington accretion
The black hole (BH) binary V404 Cyg entered the outburst phase in 2015 June after 26 yr of X-ray quiescence, and with its behaviour broke the outburst evolution...
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PublicationSwift/XRT follow-up and a refined position of the X-ray transient XTE J1728-295
Following the report of the newly detected outburst of the transient XTE J1728-295 (possibly IGR J17285-2922 detected by INTEGRAL) in the RXTE PCA bulge scans...
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PublicationTesting Mass Determinations of Supermassive Black Holes via Stellar Kinematics
We investigate the accuracy of mass determinations MBH of supermassive black holes in galaxies using dynamical models of the stellar kinematics. We compare 10...