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arXiv 1105.0772astro-ph.HEastro-ph.COastro-ph.GA
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窄线塞弗特1星系中强相对论喷流的证据

Evidence of powerful relativistic jets in narrow-line Seyfert 1 galaxies

Luigi Foschini

摘要:

2008年,费米伽马射线太空望远镜首次发现了来自几个窄线塞弗特1星系(NLS 1)的高能(E > 100 MeV)伽马射线。后来,在2009年和2010年,对其中一个源,PMN J0948+0022(z=0.585)的两次多频活动明确证实了这种类型的源中存在一个与耀变体非常相似且具有可比功率的相对论性喷流。然而,这些源既不是耀变体,也不是射电星系,因为它们的光谱和非常紧凑的射电形态证明了这一点。此外,由于NLS 1通常位于旋涡星系中,这对喷流和椭圆宿主星系之间的相关性范式产生了重大怀疑。这些发现对目前关于喷气系统的知识以及这些结构是如何产生的提出了有趣的挑战。综述了该领域的研究现状,并概述了正在进行的工作。

英文摘要:

In 2008, the Fermi Gamma-ray Space Telescope has revealed - for the first time - high-energy (E > 100 MeV) gamma rays from a few Narrow-Line Seyfert 1 Galaxies (NLS1s). Later, in 2009 and 2010, two multifrequency campaigns on one of these sources, PMN J0948+0022 (z=0.585), definitely confirmed the presence, in sources of this type, of a relativistic jet very similar and with comparable power to those in blazars. However, these sources are neither blazars nor radio galaxies, as proven by their optical spectrum and by their very compact radio morphology. Moreover, since NLS1s are generally hosted in spiral galaxies, this casts a significant doubt on the paradigm of the correlation between jets and elliptical host galaxies. These findings pose intriguing challenges to the current knowledge of jet systems and on how these structures are generated. The current status of the researches in this field is reviewed and ongoing work is outlined.

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