Astronomy and Astrophysics – Astrophysics
Scientific paper
Jul 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007sf2a.conf..143b&link_type=abstract
SF2A-2007: Proceedings of the Annual meeting of the French Society of Astronomy and Astrophysics held in Grenoble, France, July
Astronomy and Astrophysics
Astrophysics
Scientific paper
The Galactic center is known as a strong X-ray emission region. Here we present an overview of the X-ray properties and investigate two heating mechanisms that may play a significant role at intermediate and small scales. In a region of 300 pc size, the emission seems to originate in a diffuse hot (kBT=7 keV) plasma. We present recent work on the confinement and heating of such a plasma, taking into account the peculiar properties of the central region. When getting to the scale of the central accretion disk, the emission becomes harder. Synchrotron-self Compton radiation originating in a gas of relativistic electrons (γ ≈ 10^2-10^3) has been observed during flaring events. Such high energy particles imply efficient acceleration mechanisms. We present an acceleration process based on a large scale resonance and we discuss its efficiency.
Belmont Renaud
Tagger Michel
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