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首页> 外文期刊>PASJ: Publications of the Astronomical Society of Japan >Constraining Intergalactic Magnetic Field with Fermi-LAT Observation of Cascade Radiation for TeV Blazars
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Constraining Intergalactic Magnetic Field with Fermi-LAT Observation of Cascade Radiation for TeV Blazars

机译：用Fermi-LAT观察TeV Blazar的级联辐射约束星际磁场

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摘要

The problem concerning the origin of the Intergalactic Magnetic Field (IGMF) is one of the long-standing problems of astrophysics and cosmology, and direct measurements are difficult. TeV photons emitted by TeV blazars produce electron-positron pairs because of interactions with the extragalactic background light (EBL). These pairs emit secondary cascade gamma-rays via Inverse Compton scattering of the cosmic microwave background (CMB) photons. In this process, the trajectories of the pairs are deviated by the IGMF, and the cascade gamma-ray emission appears as extended emission around TeV source. We used the EBL, synchrotron self-Compton (SSC) model and the observed limits on Lorentz factor of electron-positron pairs to calculate the cascade-radiation spectrum, and then to fit the observed GeV to TeV and multi-waveband spectra of TeV blazars to constrain the IGMF. We obtained the GeV energy spectra of three TeV blazars by analyzing the Fermi-LAT data of the past ~ 3 yr. The flux upper limits of Fermi-LAT in the 90% significant level of 1ES 0229+200 suggests that the IGMF is stronger than 2 x 10-18 G for an engine time of TeV activity with three years. The relationships between the deduced lower limits of IGMF and various engine times for 1ES 0229+200 and 1ES 0347—121 are presented by us.
机译：关于星际磁场（IGMF）起源的问题是天体物理学和宇宙学的长期存在的问题之一，直接测量是困难的。 TeV blazar发射的TeV光子由于与银河外背景光（EBL）相互作用而产生电子-正电子对。这些对通过宇宙微波背景（CMB）光子的逆康普顿散射发出次级级联伽马射线。在此过程中，IGMF对的轨迹发生了偏离，而级联伽马射线发射表现为TeV源周围的扩展发射。我们使用EBL，同步加速器自康普顿（SSC）模型和电子-正电子对的Lorentz因子的观察极限来计算级联辐射谱，然后将观察到的GeV拟合为TeV和TeV blazars的多波段谱限制IGMF。通过分析过去〜3年的Fermi-LAT数据，我们获得了三种TeV blazar的GeV能谱。 Fermi-LAT的通量上限在1ES 0229 + 200的90％显着水平中表明，对于TeV活动的发动机时间为三年，IGMF比2 x 10-18 G强。我们介绍了推导出的IGMF下限与1ES 0229 + 200和1ES 0347-121的各种发动机时间之间的关系。

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