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Detection of Iron K{\alpha} Emission from a Complete Sample of Submillimeter Galaxies

Detection of Iron K{\alpha} Emission from a Complete Sample of Submillimeter Galaxies

Authors :
Lindner, Robert R.
Baker, Andrew J.
Beelen, Alexandre
Owen, Frazer N.
Polletta, Mari
Publication Year :
2012

Abstract

We present an X-ray stacking analysis of a sample of 38 submillimeter galaxies 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 ~4{\sigma} detection of Fe K{\alpha} emission with an equivalent width of EW>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.<br />Comment: 20 pages, 11 figures, accepted for publication in ApJ

Details

Database :
arXiv
Publication Type :
Report
Accession number :
edsarx.1207.4486
Document Type :
Working Paper
Full Text :
https://doi.org/10.1088/0004-637X/757/1/3