RGB J2243 +203甚高能辐射的发现及其红移上限的推导
Discovery of very-high-energy emission from RGB J2243+203 and derivation of its redshift upper limit
摘要：
甚高能量（VHE; 2014年12月21日至24日期间，VERITAS切伦科夫望远镜阵列发现了耀变体RGB J2243+203的伽马射线辐射。来自该源的VERITAS能谱可以通过具有$4.6 \pm 0.5$的光子指数和$(6.3 \pm 1.1) \times 10^{-10} ~ \textrm{cm}^{-2} \textrm{s}^{-1} \textrm{TeV}^{-1}$的0.15 TeV的通量归一化的幂律拟合。在VERITAS探测期间，从1 GeV到100 GeV的积分\textit{Fermi} -LAT通量为$(4.1 \pm 0.8) \times 10^{\textrm{-8}} ~\textrm{cm}^{\textrm{-2}}\textrm{s}^{\textrm{-1}}$，这比3FGL目录中报告的相同能量范围内的四年平均通量（$4.0 \pm 0.1 \times 10^{\textrm{-9}} ~ \textrm{cm}^{\textrm{-2}}\textrm{s}^{\textrm{-1}}$）大一个数量级。VERITAS的探测触发了\textit{Swift} -XRT在X射线波段的观测。然而，由于时间安排限制，在VERITAS检测后67小时进行了\textit{Swift} -XRT观察，而不是与VERITAS观察同时进行。观测到的2 keV ~ 10 keV的X射线能谱符合幂律，谱指数为$2.7 \pm 0.2$，同一能带的积分光子通量为$(3.6 \pm 0.6) \times 10^{-13} ~\textrm{cm}^{-2} \textrm{s}^{-1}$。导出了与EBL模型相关的耀变体红移上限。根据所使用的EBL模型，上限在z $<~0.9$至z $<~1.1$的范围内变化。
英文摘要：
Very-high-energy (VHE; $>$ 100 GeV) gamma-ray emission from the blazar RGB J2243+203 was discovered with the VERITAS Cherenkov telescope array, during the period between 21 and 24 December 2014. The VERITAS energy spectrum from this source can be fit by a power law with a photon index of $4.6 \pm 0.5$, and a flux normalization at 0.15 TeV of $(6.3 \pm 1.1) \times 10^{-10} ~ \textrm{cm}^{-2} \textrm{s}^{-1} \textrm{TeV}^{-1}$. The integrated \textit{Fermi}-LAT flux from 1 GeV to 100 GeV during the VERITAS detection is $(4.1 \pm 0.8) \times 10^{\textrm{-8}} ~\textrm{cm}^{\textrm{-2}}\textrm{s}^{\textrm{-1}}$, which is an order of magnitude larger than the four-year-averaged flux in the same energy range reported in the 3FGL catalog, ($4.0 \pm 0.1 \times 10^{\textrm{-9}} ~ \textrm{cm}^{\textrm{-2}}\textrm{s}^{\textrm{-1}}$). The detection with VERITAS triggered observations in the X-ray band with the \textit{Swift}-XRT. However, due to scheduling constraints \textit{Swift}-XRT observations were performed 67 hours after the VERITAS detection, not simultaneous with the VERITAS observations. The observed X-ray energy spectrum between 2 keV and 10 keV can be fitted with a power-law with a spectral index of $2.7 \pm 0.2$, and the integrated photon flux in the same energy band is $(3.6 \pm 0.6) \times 10^{-13} ~\textrm{cm}^{-2} \textrm{s}^{-1}$. EBL model-dependent upper limits of the blazar redshift have been derived. Depending on the EBL model used, the upper limit varies in the range from z $<~0.9$ to z $<~1.1$.
机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。
