Lehmann, I. and Hasinger, G. and Schmidt, M. and Gunn, J. E. and Schneider, D. P. and Giacconi, R. and McCaughrean, M. and Trümper, J. and Zamorani, G. (2001) Deep ROSAT Surveys & the contribution of AGNs to the soft X-ray background. In: X-ray astronomy: stellar endpoints, AGN, and the diffuse x-ray background. AIP Conference Proceedings. No.599. American Institute of Physics , Melville, N.Y., pp. 189-198. ISBN 0-7354-0043-1 http://resolver.caltech.edu/CaltechAUTHORS:20111118-092145577
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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.
|Item Type:||Book Section|
|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.|
|Subject Keywords:||galactic nuclei, X-ray sources (astronomical), cosmic background radiation, astronomical atlases, astronomical catalogues. Surveys-galaxies: active-Galaxies: Seyferts-quasars: emission lines-X-rays: galaxies.|
|Classification Code:||PACS: 98.62.Js; 98.70.Qy; 98.70.Vc; 95.80.+p|
|Official Citation:||Deep ROSAT Surveys & the contribution of AGNs to the soft X-ray background I. Lehmann, G. Hasinger, M. Schmidt, J. E. Gunn, D. P. Schneider, R. Giacconi, M. McCaughrean, J. Trumper, and G. Zamorani, AIP Conf. Proc. 599, 189 (2001), DOI:10.1063/1.1434632|
|Usage Policy:||No commercial reproduction, distribution, display or performance rights in this work are provided.|
|Deposited By:||Ruth Sustaita|
|Deposited On:||21 Nov 2011 16:03|
|Last Modified:||26 Dec 2012 14:25|
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