PG 1553+113 Lac天体BL的VERITAS观测
VERITAS Observations of the BL Lac Object PG 1553+113 Between May 2010 and May 2011
摘要：
VERITAS是一个成像大气切伦科夫望远镜阵列，研究能量范围在~100 GeV和~30 TeV之间的耀变体。凭借其在这些能量下的出色灵敏度，以及不断加深的源曝光，VERITAS能够探测遥远的耀变体，以获得由于与河外背景光（EBL）相互作用而在其非常高能量的伽马射线光谱中的清晰吸收特征。我们讨论了最近VERITAS对PG 1553+113（z > 0.4）的观测结果，这些结果导致了对该源有史以来最重要的甚高能量探测。最新的VERITAS光谱测量用于在95%置信水平下将源红移的上限设置为z < 0.5。还讨论了利用这些观测结果以及其他硬光谱耀变体的观测结果来限制EBL的前景。
英文摘要：
VERITAS, an array of imaging atmospheric-Cherenkov telescopes, studies blazars in the energy range between ~100 GeV and ~30 TeV. With its excellent sensitivity at these energies, and ever-deepening source exposures, VERITAS is in a position to probe distant blazars for clear absorption signatures in their very-high-energy gamma-ray spectra due to interactions with the extragalactic background light (EBL). We discuss results from recent VERITAS observations of PG 1553+113 (z > 0.4) which have resulted in the most significant very-high-energy detection ever obtained for this source. The most recent VERITAS spectral measurements are used to place an upper limit on the source redshift of z < 0.5 at the 95% confidence level. Also discussed are the prospects of using these observations, along with those of other hard- spectrum blazars, to place constraints on the EBL.
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