An evolving hot spot orbiting around Sgr A*
M. Zamaninasab, A. Eckart, L. Meyer, R. Schoedel, M. Dovciak, V., Karas, D. Kunneriath, G. Witzel, R. Giessuebel, S. Koenig, C. Straubmeier and, A. Zensus
TL;DR
This paper reports on near-infrared observations of Sgr A* revealing a highly contrasted flare and variable sub-flare profiles, modeled as a rotating, evolving hot spot in the accretion disk around the supermassive black hole.
Contribution
It introduces a model of a dynamic hot spot with changing shape and elongation to explain observed flare profile variations at Sgr A*.
Findings
Highest contrast sub-flare observed in May 2007
Evidence for profile variations in consecutive sub-flares
Model of spot elongation due to differential rotation
Abstract
Here we report on recent near-infrared observations of the Sgr A* counterpart associated with the super-massive ~ 4x10^6 M_sun black hole at the Galactic Center. We find that the May 2007 flare shows the highest sub-flare contrast observed until now, as well as evidence for variations in the profile of consecutive sub-flares. We modeled the flare profile variations according to the elongation and change of the shape of a spot due to differential rotation within the accretion disk.
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