科研之友
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摘要
We present an X-ray stacking analysis of a sample of 38 submillimeter galaxies (SMGs) with < z > = 2.6 discovered at >= 4 sigma significance in the Lockman Hole North with the MAMBO array. We find a 5 sigma 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 similar to 4 sigma detection of Fe K alpha emission with an equivalent width of EW greater than or similar to 1 keV. The centroid of the Fe K alpha 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.
- 出版日期2012-9-20
