Volume 379, Number 1, November III 2001
|Page(s)||L13 - L16|
|Published online||15 November 2001|
The Nature of the 10 kilosecond X-ray flare in Sgr A*
Max-Planck-Institut für Radioastronomie, Auf dem Hügel 69, 53121 Bonn, Germany
Corresponding author: S. Markoff, email@example.com
Accepted: 26 September 2001
The X-ray mission Chandra has observed a dramatic X-ray flare -a brightening by a factor of 50 for only three hours -from Sgr A*, the Galactic Center supermassive black hole. Sgr A* has never shown variability of this amplitude in the radio and we therefore argue that a jump of this order in the accretion rate does not seem the likely cause. Based on our model for jet-dominated emission in the quiescent state of Sgr A*, we suggest that the flare is a consequence of extra electron heating near the black hole. This can either lead to direct heating of thermal electrons to K and significantly increased synchrotron-self Compton emission, or result from non-thermal particle acceleration with increased synchrotron radiation and electron Lorentz factors up to . While the former scenario is currently favored by the data, simultaneous VLBI, submm, mid-infrared and X-ray observations should ultimately be able to distinguish between the two cases.
Key words: galaxy: center / galaxies: jets / X-rays: galaxies / radiation mechanisms: non-thermal / accretion, accretion disks / black hole physics
© ESO, 2001
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