ORIGIN OF THE FERMI BUBBLE

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题名:	ORIGIN OF THE FERMI BUBBLE
作者:	Cheng,KS;Chernyshov,DO;Dogiel,VA;Ko,CM;Ip,WH
贡献者:	天文研究所
关键词:	GALACTIC-CENTER;BLACK-HOLE;INTERSTELLAR-MEDIUM;RAY-EMISSION;A-ASTERISK;DISCOVERY;WIND;B2
日期:	2011
上传时间:	2012-03-27 18:12:36 (UTC+8)
出版者:	國立中央大學
摘要:	Fermi has discovered two giant gamma-ray-emitting bubbles that extend nearly 10 kpc in diameter north and south of the Galactic center. The existence of the bubbles was first evidenced in X-rays detected by ROSAT and later WMAP detected an excess of radio signals at the location of the gamma-ray bubbles. We propose that periodic star capture processes by the galactic supermassive black hole, Sgr A*, with a capture rate 3 x 10(-5) yr(-1) and energy release similar to 3 x 10(52) erg per capture can produce very hot plasma similar to 10 keV with a wind velocity similar to 10(8) cm s(-1) injected into the halo and heat up the halo gas to similar to 1 keV, which produces thermal X-rays. The periodic injection of hot plasma can produce shocks in the halo and accelerate electrons to similar to TeV, which produce radio emission via synchrotron radiation and gamma rays via inverse Compton scattering with the relic and the galactic soft photons.
關聯:	ASTROPHYSICAL JOURNAL LETTERS
显示于类别:	[天文研究所] 期刊論文

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