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A radio parallax to the black hole X-ray binary MAXI J1820+070
P. Atri, J. C. A. Miller-Jones, A. Bahramian +18
Using the Very Long Baseline Array and the European Very Long Baseline Interferometry Network we have made a precise measurement of the radio parallax of the black hole X-ray binar…
A Black Hole X-ray Binary at 100 Hz: Multiwavelength Timing of MAXI J1820+070 with HiPERCAM and NICER
J. A. Paice, P. Gandhi, T. Shahbaz +12
We report on simultaneous sub-second optical and X-ray timing observations of the low mass X-ray binary black hole candidate MAXI J1820+070. The bright 2018 outburst rise allowed s…
No sign of G2's encounter affecting Sgr A*'s X-ray flaring rate from observations
Elie Bouffard, Daryl Haggard, Michael A. Nowak +3
An unusual object, G2, had its pericenter passage around Sgr A*, the M supermassive black hole in the Galactic Centre, in Summer 2014. Several research teams…
Chandra Spectral and Timing Analysis of Sgr A*'s Brightest X-ray Flares
Daryl Haggard, Melania Nynka, Brayden Mon +17
We analyze the two brightest Chandra X-ray flares detected from Sagittarius A*, with peak luminosities more than 600 x and 245 x greater than the quiescent X-ray emission. The brig…
The unique case of the AGN core of M87: a misaligned low power blazar?
Matteo Lucchini, Felicia Krauss, Sera Markoff
M87 hosts one of the closest jetted active galactic nucleus (AGN) to Earth. Thanks to its vicinity and to the large mass of is central black hole, M87 is the only source in which t…
First M87 Event Horizon Telescope Results. VI. The Shadow and Mass of the Central Black Hole
The Event Horizon Telescope Collaboration
We present measurements of the properties of the central radio source in M87 using Event Horizon Telescope data obtained during the 2017 campaign. We develop and fit geometric cres…