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arXiv 1204.2268astro-ph.HE
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银河系3C 111射电星系FRII中的gamma-ray发射区

The gamma-ray emission region in the FRII Radio Galaxy 3C 111

Paola Grandi, Eleonora Torresi, Carlo Stanghellini

摘要:

宽线射电星系3C 111的特征是Fanaroff-Riley II(FRII)射电形态,是最近由费米大面积望远镜探测到的失调活动星系核样本的来源之一,包括射电银河系和陡谱射电类星体。我们对24个月伽马射线光变曲线的分析表明,3C 111只是偶尔在高能量下被探测到。它在2008年底是明亮的,在其余的时间里都是微弱的,低于费米大面积望远镜的灵敏度阈值。在同一时期进行的3C~111多频活动显示,2008年9月至11月的毫米波、光学和X射线通量增加,Chatterjee等人(2011)解释为由于超光速结通过喷流核心。的时间巧合的毫米光学X射线爆发与GeV的活动表明,共空间的事件,允许,第一次,本地化的γ射线耗散区在FRII喷流。我们认为,3C 111的GeV光子产生在一个紧凑的区域内被限制在0.1 pc和距离约0.3 pc的黑洞。

英文摘要:

The Broad Line Radio Galaxy 3C 111, characterized by a Fanaroff-Riley II (FRII) radio morphology, is one of the sources of the Misaligned Active Galactic Nuclei sample, consisting of Radio Galaxies and Steep Spectrum Radio Quasars, recently detected by the Fermi-Large Area Telescope. Our analysis of the 24-month gamma-ray light curve shows that 3C 111 was only occasionally detected at high energies. It was bright at the end of 2008 and faint, below the Fermi-Large Area Telescope sensitivity threshold, for the rest of the time. A multifrequency campaign of 3C~111, ongoing in the same period, revealed an increase of the mm, optical and X-ray fluxes in 2008 September-November, interpreted by Chatterjee et al. (2011) as due to the passage of a superluminal knot through the jet core. The temporal coincidence of the mm-optical-X-ray outburst with the GeV activity suggests a co-spatiality of the events, allowing, for the first time, the localization of the gamma-ray dissipative zone in a FRII jet. We argue that the GeV photons of 3C 111 are produced in a compact region confined within 0.1 pc and at a distance of about 0.3 pc from the black hole.

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