DETECTION OF IRON Kα EMISSION FROM A COMPLETE SAMPLE OF SUBMILLIMETER GALAXIES
2012; IOP Publishing; Volume: 757; Issue: 1 Linguagem: Inglês
10.1088/0004-637x/757/1/3
ISSN1538-4357
AutoresRobert R. Lindner, A. J. Baker, A. Beelen, F. N. Owen, M. Polletta,
Tópico(s)Astrophysics and Cosmic Phenomena
ResumoWe present an X-ray stacking analysis of a sample of 38 submillimeter galaxies with =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.
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