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arXiv 1708.06201astro-ph.HE
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探索1FHL和2FHL AGN样品中无线电和GeV-TeV gamma-ray发射之间的联系

Exploring the connection between radio and GeV-TeV gamma-ray emission in the 1FHL and 2FHL AGN samples

R. Lico, M. Giroletti, M. Orienti, L. Costamante, V. Pavlidou, F. D'Ammando, F. Tavecchio

摘要:

费米大面积望远镜(LAT)显示,耀变体,代表最极端的无线电大声活动星系核(AGN)人口,占主导地位的伽玛射线天空的普查,并在0.1-100 GeV的能量范围内的无线电和伽玛射线辐射之间发现了显着的相关性。然而,无线电和甚高能量(VHE,E>0.1 TeV)发射之间可能的联系仍然难以捉摸,因为缺乏VHE天空的均匀覆盖。本工作的主要目标是量化和评估的可能的联系之间的一个可能的联系的意义的射电辐射在秒差距尺度上测量的甚长基线干涉测量(VLBI)和GeV-TeV的伽玛射线辐射在blazar,这是一个中心问题,了解blazar的物理和发射过程。利用从第一和第二Fermi-LAT星表中提取的两个大的无偏活动星系核样品,研究了射电VLBI和高能γ射线辐射。为了比较,我们使用第三个费米LAT源目录提供的0.1-300 GeV的伽马射线能流进行相同的相关分析。我们发现,相关的强度和意义取决于γ射线的能量范围与不同的行为之间的耀变体的子类。总的来说,无线电和伽马射线发射超过10 GeV原来是不相关的完整的样本和所有的耀变体的子类与高同步加速器峰值(HSP)对象,其中显示出强烈的和显着的相关性。相反,当0.1-300 GeV的伽马射线能量被认为是一个强大的和显着的相关性被发现为完整的blazar样本以及所有的blazar子类。我们解释和解释这个框架内的耀变体光谱能量分布特性的相关行为。

英文摘要:

The Fermi Large Area Telescope (LAT) revealed that blazars, representing the most extreme radio-loud active galactic nuclei (AGN) population, dominate the census of the gamma-ray sky, and a significant correlation was found between radio and gamma-ray emission in the 0.1-100 GeV energy range. However, the possible connection between radio and very high energy (VHE, E>0.1 TeV) emission still remains elusive, owing to the lack of a homogeneous coverage of the VHE sky. The main goal of this work is to quantify and assess the significance of a possible connection between the radio emission on parsec scale measured by the very long baseline interferometry (VLBI) and GeV-TeV gamma-ray emission in blazars, which is a central issue for understanding the blazar physics and the emission processes. We investigate the radio VLBI and high energy gamma-ray emission by using two large and unbiased AGN samples extracted from the first and second Fermi-LAT catalogs of hard gamma-ray sources detected above 10 GeV (1FHL) and 50 GeV (2FHL). For comparison, we perform the same correlation analysis by using the 0.1-300 GeV gamma-ray energy flux provided by the third Fermi-LAT source catalog. We find that the correlation strength and significance depend on the gamma-ray energy range with a different behavior among the blazar sub-classes. Overall, the radio and gamma-ray emission above 10 GeV turns out to be uncorrelated for the full samples and for all of the blazar sub-classes with the exception of high synchrotron peaked (HSP) objects, which show a strong and significant correlation. On the contrary, when 0.1-300 GeV gamma-ray energies are considered, a strong and significant correlation is found for the full blazar sample as well as for all of the blazar sub-classes. We interpret and explain this correlation behavior within the framework of the blazar spectral energy distribution properties.

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