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• W2029401908 abstract "In this paper we combine archival and proprietary XMM-Newton observations (about 5 deg 2 ) that overlap with the Sloan Digital Sky Survey to explore the nature of the moderate-z X-ray population. We focus on X-ray sources with optically red colours (g - r > 0.4), which we argue are important for understanding the origin of the X-ray background (XRB). First, these systems constitute a significant fraction, about two-third, of the z? 1 X-ray population to the limit f(2-8 keV) ≈ 2 × 10 -14 erg s -1 cm -2 . Secondly, their luminosity function under evolution of the form α (1 + z) 3 suggests that they could be responsible for about 17 per cent of the diffuse XRB to z = 1. Thirdly, their stacked X-ray spectrum in the range 1-8 keV is consistent with a power-law distribution with r ≈ 1.4 (without fitting intrinsic absorption), that is, similar to the diffuse XRB. We find that the optically red X-ray population comprises a mixed bag of objects, both obscured [hydrogen column density (N H ) > 10 22 cm -2 ] and unobscured (N H 2 mag) AGNs identified in the Two-Micron All-Sky Survey (2MASS). The median N H of the red X-ray sources studied here is ≈10 21 cm -2 , lower than that found for the 2MASS AGNs, suggesting different populations." @default.
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• W2029401908 date "2006-02-11" @default.
• W2029401908 modified "2023-09-23" @default.
• W2029401908 title "Red active galactic nuclei in XMM-Newton/Sloan Digital Sky Survey fields" @default.
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• W2029401908 doi "https://doi.org/10.1111/j.1365-2966.2005.09835.x" @default.
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