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A single HII region model of the strong interstellar scattering towards Sgr A*
Egid Sicheneder, Jason Dexter
Until recently, the strong interstellar scattering observed towards the Galactic center (GC) black hole, Sgr A*, was thought to come from dense gas within the GC region. The pulse…
An Update on Monitoring Stellar Orbits in the Galactic Center
Stefan Gillessen, Philipp Plewa, Frank Eisenhauer +9
Using 25 years of data from uninterrupted monitoring of stellar orbits in the Galactic Center, we present an update of the main results from this unique data set: A measurement of…
The impact of non-thermal electrons on event horizon scale images and spectra of Sgr A*
S. Alwin Mao, Jason Dexter, Eliot Quataert
Decomposing an arbitrary electron energy distribution into sums of Maxwellian and power law components is an efficient method to calculate synchrotron emission and absorption. We u…
The Close AGN Reference Survey (CARS) - What is causing Mrk1018's return to the shadows after 30 years?
B. Husemann, T. Urrutia, G. R. Tremblay +11
We recently discovered that the active galactic nucleus (AGN) of Mrk 1018 has changed optical type again after 30 years as a type 1 AGN. Here we combine Chandra, NuStar, Swift, Hub…
Persistent Asymmetric Structure of Sagittarius A* on Event Horizon Scales
Vincent L. Fish, Michael D. Johnson, Sheperd S. Doeleman +69
The Galactic Center black hole Sagittarius A* (Sgr A*) is a prime observing target for the Event Horizon Telescope (EHT), which can resolve the 1.3 mm emission from this source on…
A public code for general relativistic, polarised radiative transfer around spinning black holes
Jason Dexter
Ray tracing radiative transfer is a powerful method for comparing theoretical models of black hole accretion flows and jets with observations. We present a public code, grtrans, fo…
Young and Millisecond Pulsar GeV Gamma-ray Fluxes from the Galactic Center and Beyond
Ryan M. O'Leary, Matthew D. Kistler, Matthew Kerr +1
Gamma-ray observations have shown pulsars to be efficient converters of rotational energy into GeV photons and it is of wide-ranging interest to determine their contribution to the…