Detection of X-Ray Emission from Gravitationally Lensed Submillimeter Sources in the Field of Abell 370
Detection of X-Ray Emission from Gravitationally Lensed Submillimeter Sources in the Field of Abell 370
复制标题
检测 Abell 370 场中引力透镜亚毫米源的 X 射线发射
DOI：
10.1086/317272
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发表时间：
2000
期刊：
影响因子：
--
通讯作者：
G. Garmire
中科院分区：
文献类型：
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作者：
M. Bautz;M. Malm;F. Baganoff;G. Ricker;C. Canizares;W. Brandt;A. Hornschemeier;G. Garmire
我们报告了钱德拉探测到SMM J 02399 -0134和SMM J 02399 -0136，这两个遥远的亚毫米源（z = 1.06和z = 2.81，分别）被星系团阿贝尔370引力放大。这些是高红移亚毫米波源群的高显著性（>7 σ）X射线探测。X射线位置与光学位置一致，误差在1“以内。X射线光谱虽然信噪比低，但相当困难。固定光子指数为Γ = 2.0的吸收幂律模型意味着两个光源的局部吸收柱大于2 × 1023 cm-2，未吸收光度大于1044 ergs-1。这些结果意味着核活动是造成SMM J 02399 -0134大部分光度和SMM J 02399 -0136至少20%光度的原因，与以前的光学观测结果一致。我们还将第三个亚毫米源SMM J 02400 -0134的X射线通量的上限。考虑到与以前公布的钱德拉上限的X射线通量从亚毫米源，我们的研究结果意味着，20%的亚毫米源表现出X射线发射从活动星系核（90%的置信度），与预期的贡献扩散X射线背景一致。
We report the detection by Chandra of SMM J02399-0134 and SMM J02399-0136, two distant (z = 1.06 and z = 2.81, respectively) submillimeter sources gravitationally magnified by the galaxy cluster Abell 370. These are high-significance (>7 σ) X-ray detections of the high-redshift submillimeter source population. The X-ray positions are coincident with the optical positions to within 1''. The X-ray spectra, while of low signal-to-noise ratio, are quite hard. Absorbed power-law models with fixed photon indices of Γ = 2.0 imply local absorbing columns greater than 2 × 1023 cm-2 and unabsorbed luminosities greater than 1044 ergs s-1 in both sources. These results imply that nuclear activity is responsible for the bulk of the luminosity in SMM J02399-0134 and for at least 20% of the luminosity of SMM J02399-0136, consistent with previous optical observations. We also place an upper limit on the X-ray flux of a third submillimeter source, SMM J02400-0134. Considered together with previously published Chandra upper limits on the X-ray flux from submillimeter sources, our results imply that 20% of submillimeter sources exhibit X-ray emission from active galactic nuclei (with 90% confidence), consistent with expectations of their contribution to the diffuse X-ray background.