两颗遥远的VHE Blazar：1 ES 1101-232和1 ES 1553+113的硬X射线观测
A Hard X-Ray View of Two Distant VHE Blazars: 1ES 1101-232 and 1ES 1553+113
摘要：
TeV耀变体被认为是整个电磁波谱中突出的非热发射体，其光子功率峰值在X射线和TeV波段。如果距离很远，银河系外背景光（EBL）对伽马射线光子的吸收会改变固有的TeV光谱形状，从而影响整体解释。朱雀号分别于2006年5月和7月对两个迄今已知的更遥远的TeV耀变体1 ES 1101-232和1 ES 1553+113进行了观测，包括用最先进的切伦科夫望远镜设施进行的准同步覆盖。我们报告的结果数据集，重点是X射线带，并设置在上下文中，以他们的历史行为。在我们的活动期间，我们没有检测到任何显著的X射线或伽马射线变异性。发现1 ES 1101-232处于静止状态，具有有史以来测量的最低X射线通量。1 ES 1101-232和1 ES 1553+113的组合XIS和HXD PIN数据清楚地表明了高达最高硬X射线数据点（~30 keV）的光谱曲率，表现为随着能量的增加而软化。我们描述了这个频谱形状的一个破碎的幂律或对数抛物线拟合具有相同的统计拟合优度。1 ES 1553+113的组合甚高能谱（90-500 GeV）与早期的观测相比没有任何显着变化。由此产生的同时宽带光谱能量分布的TeV耀变体的内在耀变体参数值的影响，考虑到在EBL的伽马射线吸收的角度进行了讨论。
英文摘要：
TeV blazars are known as prominent nonthermal emitters across the entire electromagnetic spectrum with their photon power peaking in the X-ray and TeV bands. If distant, absorption of gamma-ray photons by the extragalactic background light (EBL) alters the intrinsic TeV spectral shape, thereby affecting the overall interpretation. Suzaku observations for two of the more distant TeV blazars known to date, 1ES 1101-232 and 1ES 1553+113, were carried out in 2006 May and July, respectively, including a quasi-simultaneous coverage with the state-of-the-art Cerenkov telescope facilities. We report on the resulting data sets with emphasis on the X-ray band and set in context to their historical behavior. During our campaign, we did not detect any significant X-ray or gamma-ray variability. 1ES 1101-232 was found in a quiescent state with the lowest X-ray flux ever measured. The combined XIS and HXD PIN data for 1ES 1101-232 and 1ES 1553+113 clearly indicate spectral curvature up to the highest hard X-ray data point (~30 keV), manifesting as softening with increasing energy. We describe this spectral shape by either a broken power law or a log-parabolic fit with equal statistical goodness of fits. The combined 1ES 1553+113 very high energy spectrum (90-500 GeV) did not show any significant changes with respect to earlier observations. The resulting contemporaneous broadband spectral energy distributions of both TeV blazars are discussed in view of implications for intrinsic blazar parameter values, taking into account the gamma-ray absorption in the EBL.
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