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Detection of a drag force in G2's orbit: Measuring the density of the accretion flow onto Sgr A* at 1000 Schwarzschild radii
S. Gillessen, P. M. Plewa, F. Widmann +14
The Galactic Center black hole Sgr A* is the archetypical example of an underfed massive black hole. The extremely low accretion rate can be understood in radiatively inefficient a…
Detection of orbital motions near the last stable circular orbit of the massive black hole SgrA*
GRAVITY Collaboration, R. Abuter, A. Amorim +57
We report the detection of continuous positional and polarization changes of the compact source SgrA* in high states ('flares') of its variable near- infrared emission with the nea…
A Detection of Sgr A* in the far infrared
Sebastiano D. von Fellenberg, Stefan Gillessen, Javier Graciá-Carpio +14
We report the first detection of the Galactic Centre massive black hole, Sgr~A*, in the far infrared. Our measurements were obtained with PACS on board the \emph{Herschel} satellit…
Optical Distortion in the NACO Imager
P. M. Plewa, S. Gillessen, M. Bauböck +11
In this research note, we present a set of distortion solutions that may be used to correct geometric optical distortion in images taken with the S13 camera of the NACO adaptive op…
What stellar orbit is needed to measure the spin of the Galactic center black hole from astrometric data?
Idel Waisberg, Jason Dexter, Stefan Gillessen +11
Astrometric and spectroscopic monitoring of individual stars orbiting the supermassive black hole in the Galactic Center offer a promising way to detect general relativistic effect…