Astronomy and Astrophysics – Astronomy
Scientific paper
Mar 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008aspc..381..383a&link_type=abstract
The Second Annual Spitzer Science Center Conference: Infrared Diagnostics of Galaxy Evolution. ASP Conference Series, Vol. 381,
Astronomy and Astrophysics
Astronomy
Scientific paper
Deep X-ray surveys provide the most efficient identification of Active Galactic Nuclei (AGN) activity. However, recent evidence has indicated that the current <10 keV surveys do not detect the most heavily obscured AGNs. Here we explore whether the X-ray undetected AGN population can be identified within the ultra-deep Spitzer survey of the GOODS-N field using X-ray stacking techniques. We find evidence for AGN activity in the Spitzer dataset and the strongest and hardest X-ray signal is produced by galaxies with starburst-like infrared spectral slopes and median properties of z≈ 0.8 and L_{IR}≈10^{11} erg s^{-1}. The stacked X-ray properties suggest that obscured AGN activity is present in these sources, with a median X-ray spectral slope of Γ≈1 and L_{X}≈10^{42} erg s^{-1}. These overall properties are consistent with the obscured AGN population expected to produce the unresolved X-ray background.
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