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arXiv 1508.06334astro-ph.HE
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VERITAS发现RGB J2243 +203的甚高能Gamma-Ray发射

VERITAS Discovery of Very High-Energy Gamma-Ray Emission from RGB J2243+203

A. U. Abeysekara

摘要:

RGB J2243+203是一颗估计红移大于0.39的耀变体,被分类为中频峰值BL Lac天体和高频峰值BL Lac天体。VERITAS在2014年12月21日UTC(57012 MJD)和2014年12月24日UTC(57015 MJD)之间的4小时内检测到该源,其统计学显著性为5.6 $σ$/$\sim$。在160 GeV以上观测到了$2.03 \pm 0.54 \times 10^{-11} \textrm{cm}^{-2}\textrm{s}^{-1}$的积分通量。γ射线谱可以描述为一个简单的幂律谱,谱指数为$-4.64 \pm 0.56$。VERITAS测量得到了准同步费米LAT和Swift-XRT观测的补充,能量范围分别为1-100 GeV和2-10 keV。在VERITAS观测的三天时间内,与费米-LAT观测的前四年的通量相比,在1-100 GeV能量下检测到增加的通量水平。Swift-XRT观测是在这段时间之后的2.8天进行的,能量范围为0.3-10 keV的积分X射线通量并没有明显高于档案数据的基线通量。

英文摘要:

RGB J2243+203 is a blazar at an estimated redshift of greater than 0.39 that has been classified both as an intermediate-frequency-peaked BL Lac object and as a high-frequency-peaked BL Lac object. This source has been detected by VERITAS at a statistical significance of 5.6 $σ$ in $\sim$4 hours between 21 Dec 2014 UTC (57012 MJD) and 24 Dec 2014 UTC (57015 MJD). An integral flux of $2.03 \pm 0.54 \times 10^{-11} \textrm{cm}^{-2}\textrm{s}^{-1}$ has been observed above 160 GeV. The gamma-ray spectrum can be described as a simple power-law spectrum with spectral index of $-4.64 \pm 0.56$. VERITAS measurements are complemented by quasi-simultaneous Fermi-LAT and Swift-XRT observations, in the energy ranges of 1-100 GeV and 2-10 keV, respectively. During the three day time period of VERITAS observations, an increased flux level at 1-100 GeV energies was detected compared to the flux from the first four years of Fermi-LAT observations. The Swift-XRT observations were taken 2.8 days after this period, and the integral X-ray flux in the energy range 0.3-10 keV is not significantly higher than a baseline flux from archival data.

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