IGR J22517+2218=MG3 J225155+2217: A New Gamma-Ray Lighthouse in the Distant Universe

IGR J22517+2218=MG3 J225155+2217: A New Gamma-Ray Lighthouse in the Distant Universe
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IGR J22517 2218=MG3 J225155 2217:遥远宇宙中的一座新伽马射线灯塔

DOI:
10.1086/523757
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发表时间:
2007
期刊:
The Astrophysical Journal
影响因子:
--
通讯作者:
Bassani L
Bassani L
中科院分区:
--
文献类型:
--
作者:
Bassani L

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我们报告的一个新的软γ射线源,即IGR J22517+ 2218,检测与INTEGRAL IBIS的识别。该源的观测能量为20-100 keV,通量约为4× 10-11 ergs cm-2 s-1,在空间上与z= 3.668的类星体MG 3 J225155+ 2217重合。0.5-10 keV的Swift XRT连续谱是平坦的(Γ= 1.5),有证据表明,由于固有吸收(NH = 3±2× 1022 cm-2)或斜率变化(ΔΓ= 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天的时间内,进一步支持斯威夫特和INTEGRAL光谱之间的通量不匹配。IGR J22517+ 2218是一个射电噪声很大的类星体,具有平坦的射电频谱;在光学上,它是一个宽线发射类星体,具有非典型的窄线吸收系统。与类似类型的耀变体相比,源的光谱能量分布是不寻常的:它要么在X射线/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。
We report on the identification of a new soft gamma-ray source, namely, IGR J22517+ 2218, detected with INTEGRAL IBIS. The source, which has an observed 20-100 keV flux of~ 4× 10-11 ergs 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 (Γ= 1.5) with evidence for a spectral curvature below 1-2 keV either due to intrinsic absorption (N H= 3±2× 10 22 cm-2) or to a change in slope (ΔΓ= 0.5). X-ray observations indicate flux variability over a 6 day period that 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-ray/gamma-ray band (ie, much higher than generally observed) or the Compton peak in the MeV range (ie, 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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