Deep ROSAT Surveys & the contribution of AGNs to the soft X-ray background

Creators: Lehmann, I.; Hasinger, G.; Schmidt, M.; Gunn, J. E.; Schneider, D. P.; Giacconi, R.; McCaughrean, M.; Trümper, J.; Zamorani, G.

Others:: White, N. E.; Malaguti, G.; Palumb, G. G. C.

Abstract

The ROSAT Deep Surveys in the Lockman Hole have revealed that AGNs are the main contributors (~75%) to the soft X-ray background in the 1–2 keV band. Using new optical/infrared and radio observations we have obtained a nearly complete identification (93%) of the 91 X-ray sources down to a limiting flux of 1.2·10^(–15) erg cm^(–2) s^(–1) in the 0.5–2.0 keV band. We present the optical colors and the emission line properties of our AGNs in comparison with other X-ray selected AGN samples. Furthermore we discuss the fraction of red AGNs found in the ROSAT Deep Surveys. From the ROSAT Deep Surveys we see no evidence for a new class of X-ray bright galaxies, which significantly contributes to the soft X-ray background.

Additional Information

© 2001 American Institute of Physics. Issue Date: 5 December 2001. We acknowledge the support in part by NASA grants NAG5-1531 (M.S.), NAG8-794, NAG5-1649, and NAGW-2508 (R.G.), and NSF grant AST-9509919 (D.S.). G.H. acknowledges the grant FKZ 50 OR 9908 0 by the Deutsches Zebtrum fur Luftund Raumfahrt e.V. (DLR). G.Z. acknowledges partial support by the Italian Space Agency (ASI) under contract ARS-96-70 and the Italian Ministry for University and Research (MURST) under grant Cofin 98-02-32.

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