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- University of CreteGR506 papers
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26 papers · 2 filters
Unveiling the origin of the optical/UV emission from the Galactic ULX Swift J0243.6+6124 during its 2017-2018 giant outburst
J. Alfonso-Garzón, J. van den Eijnden, N. P. M. Kuin +8
From late September 2017 to February 2018, the Be X-ray binary (BeXB) Swift J0243.6+6124 underwent an unprecedently bright giant outburst. The reported X-ray luminosities were so h…
Unveiling the Bent Jet Structure and Polarization of OJ 287 at 1.7 GHz with Space VLBI
Ilje Cho, José L. Gómez, Rocco Lico +16
We present total intensity and linear polarization images of OJ287 at 1.68GHz, obtained through space-based VLBI observations with RadioAstron on April 16, 2016. The observations w…
First M87 Event Horizon Telescope Results. IX. Detection of Near-horizon Circular Polarization
The Event Horizon Telescope Collaboration
Event Horizon Telescope (EHT) observations have revealed a bright ring of emission around the supermassive black hole at the center of the M87 galaxy. EHT images in linear polariza…
Reliable Identification of Binary Supermassive Black Holes from Rubin Observatory Time-Domain Monitoring
Megan C. Davis, Kaylee E. Grace, Jonathan R. Trump +7
Periodic signatures in time-domain observations of quasars have been used to search for binary supermassive black holes. These searches, across existing time-domain surveys, have p…
Polarimetric Geometric Modeling for mm-VLBI Observations of Black Holes
Freek Roelofs, Michael D. Johnson, Andrew Chael +4
The Event Horizon Telescope (EHT) is a millimeter very long baseline interferometry (VLBI) array that has imaged the apparent shadows of the supermassive black holes M87* and Sagit…
Detection of X-ray/UV delay in NGC 4051 using AstroSat observations
Kavita Kumari, G. C. Dewangan, I. E. Papadakis +1
We study the connection between the variations in the far ultra-violet (FUV), near ultra-violet (NUV) and X-ray band emission from NGC 4051 using 4-days long AstroSat observations…