Exploring the Early Universe with XMM-Newton

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dc.creatorLehmann, I.
dc.creatorHasinger, G.
dc.creatorMurray, S. S.
dc.creatorSchmidt, M.
dc.date2001-09-11
dc.date.accessioned2026-07-07T01:59:56Z
dc.date.available2026-07-07T01:59:56Z
dc.descriptionThe question of the X-ray background has been largely settled over the last 10 years using the ROSAT satellite. About 70-80 % of the soft X-ray background was resolved into discrete sources, which are mainly X-ray and optically unobscured AGNs (Quasars, Sy1). Furthermore we found already several obscured AGNs in deep ROSAT surveys, which are predicted by the population synthesis models for the X-ray background, based on the unified AGN schemes. However, deep X-ray surveys using Chandra} and XMM-Newton allow to test the reliability of these models, which seem to be still far from unique. Recent observations with Chandra and XMM-Newton have resolved most of the hard X-ray background into discrete sources. The first deep XMM-Newton survey was performed in the Lockman Hole region, one of the sky areas best studied over a wide wavelength range. About 100 ksec good exposure time have been accumulated with the EPIC camera during the performance verification phase. We reach a limiting flux of 0.31, 1.4 and 2.4 x 10E-15 erg/cm2/s in the 0.5-2, 2-10 and 5-10 keV energy bands. A significant number of X-ray sources show hard, probably intrinsically absorbed X-ray spectra. We discuss the X-ray, optical and infrared properties of these sources in comparison with the predictions of the recent X-ray background models.
dc.descriptionProceedings for X-rays at Sharp Focus Chandra Science Symposium, 11 pages, 6 figures (Fig 1 in JPEG)
dc.identifierhttps://arxiv.org/abs/astro-ph/0109172
dc.identifierhttp://arxiv.org/abs/astro-ph/0109172
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/3310
dc.subjectAstrophysics
dc.titleExploring the Early Universe with XMM-Newton
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