Variations in the spectral slope of Sgr A* during a NIR flare

Details Variations in the spectral slope of Sgr A* during a NIR flare Variations in the spectral slope of Sgr A* during a NIR flare

2005-11-10

arxiv.org/abs/astro-ph/0511302v2

Astrophys.J.640:L163-L166,2006

Astronomy and Astrophysics

Astrophysics

4 pages, 3 figures, emulateapj.cls, accepted by ApJL, v2: more detailed analysis section

Scientific paper

10.1086/503557

We have observed a bright flare of Sgr A* in the near infrared with the adaptive optics assisted integral field spectrometer SINFON. Within the uncertainties, the observed spectrum is featureless and can be described by a power law. Our data suggest that the spectral index is correlated with the instantaneous flux and that both quantities experience significant changes within less than one hour. We argue that the near infrared flares from Sgr A* are due to synchrotron emission of transiently heated electrons, the emission being affected by orbital dynamics and synchrotron cooling, both acting on timescales of ~20 minutes.

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