2012/07/18 by Robert R. Lindner, Andrew J. Baker, A. J. Baker +6
Physics and Astronomy · #Astronomy #Astrophysical Phenomena and Observations #Astrophysics #Astrophysics and Cosmic Phenomena #Emission spectrum #Flux (metallurgy) #Galaxies: Formation, Evolution, Phenomena #Galaxy #Infrared #Ion #Ionization #Line (geometry) #Materials science #Nuclear magnetic resonance #Physics #Redshift #Sigma #Spectral line #Stacking #astro-ph.CO
paper · pdf · doi:10.1088/0004-637x/757/1/3
20 pages, 11 figures, accepted for publication in ApJ
arxiv created 2012/07/18 · openalex publication_date 2012/08/28 · arxiv updated 2015/06/05 · openalex created_date 2020/11/23 · openalex updated_date 2026/08/05
We present an X-ray stacking analysis of a sample of 38 submillimeter galaxies (SMGs) 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.