IGR J22517 +2218= MG3 J225155 +2217：遥远宇宙中的新gamma-ray灯塔
IGR J22517+2218=MG3 J225155+2217: a new gamma-ray lighthouse in the distant Universe
摘要：
我们报告的一个新的软γ射线源，即IGR J22517+2218，检测与IBIS/INTEGRAL的识别。该源在20-100 keV之间观测到的通量约为4 x10^-11 erg cm-2 s-1，在空间上与z=3.668的类星体MG 3 J225155+2217重合。Swift/XRT 0.5-10 keV连续谱是平坦的（伽马=1.5），有证据表明，由于固有吸收（NH=3 +/- 2 x 10^22 cm-2）或斜率变化（Δ伽马= 0.5），光谱曲率低于1-2 keV。X射线观测表明通量的变化超过6天的时间，这是进一步支持的斯威夫特和积分谱之间的通量不匹配。IGR J22517+2218是一个射电大的类星体，有一个平坦的射电频谱;在光学上它是一个宽线发射类星体，具有非典型的特性，拥有一个窄线吸收系统。与类似类型的耀变体相比，它的源光谱能量分布是不寻常的：它要么在X/伽马射线波段（即比通常观察到的高得多）有同步加速器峰值，要么在MeV范围内（即比通常测量的低）有康普顿峰值。IGR J22517+2218= MG 3 J225155+2217是在20 keV以上探测到的第二个最遥远的耀变体，也是从我们宇宙边缘发出的伽马射线灯塔。
英文摘要：
We report on the identification of a new soft gamma ray source, namely IGR J22517+2218, detected with IBIS/INTEGRAL. The source, which has an observed 20-100 keV flux of ~4 x10^-11 erg cm-2 s-1, is spatially coincident with MG3 J225155+2217, a quasar at z=3.668. The Swift/XRT 0.5-10 keV continuum is flat (Gamma=1.5) with evidence for a spectral curvature below 1-2 keV either due to intrinsic absorption (NH=3 +/- 2 x 10^22 cm-2) or to a change in slope (Delta Gamma= 0.5). X-ray observations indicate flux variability over a 6 days period which is further supported by a flux mismatch between Swift and INTEGRAL spectra. IGR J22517+2218 is radio loud and has a flat radio spectrum; optically it is a broad line emitting quasar with the atypical property of hosting a narrow line absorption system. The Source Spectral Energy Distribution is unusual compared to blazars of similar type: either it has the synchrotron peak in the X/gamma-ray band (i.e. much higher than generally observed) or the Compton peak in the MeV range (i.e. lower than typically measured). IGR J22517+2218=MG3 J225155+2217 is the second most distant blazar detected above 20 keV and a gamma-ray lighthouse shining from the edge of our Universe.
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