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首页> 外文期刊>The Astrophysical journal >INTRINSIC CONSTRAINTS ON VERY HIGH ENERGY EMISSION IN GAMMA-RAY-LOUD BLAZARS
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INTRINSIC CONSTRAINTS ON VERY HIGH ENERGY EMISSION IN GAMMA-RAY-LOUD BLAZARS

机译：伽马射线辐射布拉泽斯非常高能量发射的内在约束

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摘要

Photons with very high energy (VHE) up to TeV emitted from active galactic nuclei (AGNs) provide some invaluable information on the origin of γ-ray emission. Although 66 blazars have been detected by EGRET, only three low-redshift X-ray-selected BL Lac objects (Mrk 421, Mrk 501, and 1BS 2344 + 514) are conclusive TeV emitters (PKS 2155 — 304 is a potential TeV emitter), since VHE photons may be absorbed by cosmological background infrared photons (external absorption). Based on the "mirror" effect of clouds in the broad-line region, we argue that there is an intrinsic mechanism for the deficiency of TeV emission in blazars. Employing the observable quantities, we derive the pair production optical depth τ_(γγ)(ε_(obs )) due to the interaction of VHE photons with the reflected synchrotron photons by electron Thomson scattering in the broad-line region. This sets stronger constraints on very high energy emission, and provides a sensitive upper limit on the Doppler factor of the relativistic bulk motion. It has been suggested that the intrinsic absorption be distinguished from the external by the observation on variation of the multiwavelength continuum.
机译：从活动星系核（AGN）发射的具有高达TeV的非常高能量（VHE）的光子提供了有关γ射线发射起源的一些宝贵信息。尽管EGRET已检测到66种爆炸物，但只有三个低红移X射线选择的BL Lac对象（Mrk 421，Mrk 501和1BS 2344 + 514）是确定的TeV发射器（PKS 2155 — 304是潜在的TeV发射器） ，因为VHE光子可能被宇宙背景红外光子吸收（外部吸收）。基于宽线区域中云的“镜像”效应，我们认为存在一种内在机制，可抑制Blazar中的TeV发射。利用可观测量，由于宽线区域中电子汤姆森散射引起的VHE光子与反射的同步加速器光子的相互作用，我们推导了成对产生光学深度τ_（γγ）（ε_（obs））。这对非常高的能量发射设置了更严格的约束，并为相对论整体运动的多普勒因子提供了敏感的上限。已经提出通过观察多波长连续体的变化将本征吸收与外部吸收区分开。

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