123 citations · 262 across the 4 of their papers we have counts for
10 papers
Dynamical Imaging with Interferometry
Michael D. Johnson, Katherine L. Bouman, Lindy Blackburn +7
By linking widely separated radio dishes, the technique of very long baseline interferometry (VLBI) can greatly enhance angular resolution in radio astronomy. However, at any given…
Quantifying Intrinsic Variability of Sagittarius A* using Closure Phase Measurements of the Event Horizon Telescope
Freek Roelofs, Michael D. Johnson, Hotaka Shiokawa +2
General relativistic magnetohydrodynamic (GRMHD) simulations of accretion disks and jets associated with supermassive black holes show variability on a wide range of timescales. On…
Locating the intense interstellar scattering towards the inner Galaxy
J. Dexter, A. Deller, G. C. Bower +9
We use VLBA+VLA observations to measure the sizes of the scatter-broadened images of 6 of the most heavily scattered known pulsars: 3 within the Galactic Centre (GC) and 3 elsewher…
Observing---and Imaging---Active Galactic Nuclei with the Event Horizon Telescope
Vincent L. Fish, Kazunori Akiyama, Katherine L. Bouman +7
Originally developed to image the shadow region of the central black hole in Sagittarius A* and in the nearby galaxy M87, the Event Horizon Telescope (EHT) provides deep, very high…
RadioAstron Observations of the Quasar 3C273: a Challenge to the Brightness Temperature Limit
Y. Y. Kovalev, N. S. Kardashev, K. I. Kellermann +17
Inverse Compton cooling limits the brightness temperature of the radiating plasma to a maximum of K. Relativistic boosting can increase its observed value, but apparent…
Interstellar Scintillation and the Radio Counterpart of the Fast Radio Burst FRB150418
Kazunori Akiyama, Michael D. Johnson
Keane et al. (2016) have recently reported the discovery of a new fast radio burst, FRB150418, with a promising radio counterpart at 5.5 and 7.5 GHz -- a rapidly decaying source, f…