Nuclear interaction gamma-ray lines from the Galactic center region

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题名:	Nuclear interaction gamma-ray lines from the Galactic center region
作者:	Dogiel,VA;Tatischeff,V;Cheng,KS;Chernyshov,DO;Ko,CM;Ip,WH
贡献者:	天文研究所
关键词:	MASSIVE BLACK-HOLE;ACCELERATED PARTICLE INTERACTIONS;SAGITTARIUS-A-ASTERISK;MOLECULAR CLOUDS;TIDAL DISRUPTION;X-RAYS;ANNIHILATION EMISSION;SOLAR-FLARE;STARS;GALAXIES
日期:	2009
上传时间:	2010-06-29 19:34:49 (UTC+8)
出版者:	中央大學
摘要:	Aims. The accretion of stars onto the central supermassive black hole at the center of the Milky Way is predicted to generate large fluxes of subrelativistic ions in the Galactic center region. We analyze the intensity, shape, and spatial distribution of de-excitation gamma-ray lines produced by nuclear interactions of these energetic particles with the ambient medium. Methods. We first estimated the amount and mean kinetic energy of particles released from the central black hole during star disruption. We then calculated the energy and spatial distributions of these particles in the Galactic center region from a kinetic equation. These particle distributions were then used to derive the characteristics of the main nuclear interaction gamma-ray lines. Results. Because the time period of star capture by the supermassive black hole is expected to be shorter than the lifetime of the ejected fast particles against Coulomb losses, the gamma-ray emission is predicted to be stationary. We find that the nuclear de-excitation lines should be emitted from a region with a maximum 5. angular radius. The total gamma-ray line flux below 8 MeV is calculated to be similar to 10(-4) photons cm(-2) s(-1). The most promising lines for detection are those at 4.44 and similar to 6.2 MeV, with a predicted flux in each line of similar to 10(-5) photons cm(-2) s(-1). Unfortunately, it is unlikely that this emission can be detected with the INTEGRAL observatory. But the predicted line intensities appear to be within reach of future gamma-ray space instruments. A future detection of de-excitation gamma-ray lines from the Galactic center region would provide unique information on the high-energy processes induced by the central supermassive black hole and the physical conditions of the emitting region.
關聯:	ASTRONOMY & ASTROPHYSICS
显示于类别:	[天文研究所] 期刊論文

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