arXivDaily arXiv每日学术速递 周一至周五更新
北美退伍军人节(Veterans Day),12 日无更新
arXiv 1207.4486astro-ph.CO
收藏

亚毫米波半导体全样品铁Kα发射的探测

Detection of Iron Kα Emission from a Complete Sample of Submillimeter Galaxies

Robert R. Lindner, Andrew J. Baker, Alexandre Beelen, Frazer N. Owen, Mari Polletta

摘要:

利用MAMBO阵列对在Lockman Hole North发现的38个=2.6的亚毫米星系进行了X射线叠加分析<z>。我们在堆叠的软带(0.5-2.0 keV)图像中发现5σ检测,并且在硬带(2.0-8 keV)中没有显著检测。我们还进行了基于光谱学和光度学红移的静止框架光谱叠加,发现了Fe Kα发射的~4σ检测,其等效宽度EW&gt;1 keV。Fe Kα发射的质心位于6.7 keV附近,表明可能来自高度电离的Fe XXV或Fe XXVI;也有轻微的迹象表明,线发射比X射线连续谱在空间上延伸得更远。这是第一个完整的X射线分析,磁通量有限的样品SMG与统计上强大的无线电同行。

英文摘要:

We present an X-ray stacking analysis of a sample of 38 submillimeter galaxies with <z>=2.6 discovered at >4σ significance in the Lockman Hole North with the MAMBO array. We find a 5σ detection in the stacked soft band (0.5-2.0 keV) image, and no significant detection in the hard band (2.0-8 keV). We also perform rest-frame spectral stacking based on spectroscopic and photometric redshifts and find a ~4σ detection of Fe Kα emission with an equivalent width of EW>1 keV. The centroid of the Fe Kα emission lies near 6.7 keV, indicating a possible contribution from highly ionized Fe XXV or Fe XXVI; there is also a slight indication that the line emission is more spatially extended than the X-ray continuum. This is the first X-ray analysis of a complete, flux-limited sample of SMGs with statistically robust radio counterparts.

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。

↑