The BL Lac heart of Centaurus A
The BL Lac heart of Centaurus A
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半人马座 A 的 BL Lac 心脏
DOI：
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发表时间：
2001
期刊：
影响因子：
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通讯作者：
A. Celotti
中科院分区：
文献类型：
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作者：
M. Chiaberge;A. Capetti;A. Celotti
从最近的射电星系半人马座A的核发射，从射电到伽马射线波段观察。我们建立，第一次，它的整体光谱能量分布（SED），似乎是有趣的类似于耀变体，显示两个宽峰分别位于远红外波段和~0.1 MeV。用同步辐射自康普顿模型成功地再现了半人马座A的全核辐射。估计的发射源的物理参数是类似的BL拉克，除了一个小得多的聚束因子，定性预期时，相对论射流是在一个大角度的视线。这些结果代表了强有力的证据，半人马座A确实是一个方向错误的BL Lac，并提供了强有力的支持，有利于低光度射电响亮AGN的统一计划。半人马座A的SED的建模也提供了进一步的和独立的迹象，在亚pc尺度射流的速度结构的存在。
Emission from the nucleus of the closest radio galaxy, Centaurus A, is observed from the radio to the gamma ray band. We build, for the first time, its overall Spectral Energy Distribution (SED) that appears to be intriguingly similar to those of blazars, showing two broad peaks located in the far-infrared band and at ~0.1 MeV respectively. The whole nuclear emission of Centaurus A is successfully reproduced with a synchrotron self-Compton model. The estimated physical parameters of the emitting source are similar to those of BL Lacs, except for a much smaller beaming factor, as qualitatively expected when a relativistic jet is orientated at a large angle to the line of sight. These results represent strong evidence that Centaurus A is indeed a misoriented BL Lac and provide strong support in favour of the unification scheme for low luminosity radio-loud AGNs. Modeling of the SED of Centaurus A also provides further and independent indications of the presence of velocity structures in sub-pc scale jets.