A Classic Type 2 QSO

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dc.creatorNorman, C.
dc.creatorHasinger, G.
dc.creatorGiacconi, R.
dc.creatorGilli, R.
dc.creatorKewley, L.
dc.creatorNonino, M.
dc.creatorRosati, P.
dc.creatorSzokoly, G.
dc.creatorTozzi, P.
dc.creatorWang, J.
dc.creatorZheng, W.
dc.creatorZirm, A.
dc.creatorBergeron, J.
dc.creatorGilmozzi, R.
dc.creatorGrogin, N.
dc.creatorKoekemoer, A.
dc.creatorSchreier, E.
dc.date2001-03-13
dc.date2002-01-04
dc.date.accessioned2026-07-07T11:08:00Z
dc.date.available2026-07-07T11:08:00Z
dc.descriptionIn the Chandra Deep Field South 1Msec exposure we have found, at redshift 3.700 +- 0.005, the most distant Type 2 AGN ever detected. It is the source with the hardest X-ray spectrum with redshift z>3. The optical spectrum has no detected continuum emission to a 3sigma detection limit of ~3 10^{-19} ergs/s/cm^2/AA and shows narrow lines of Ly_alpha, CIV, NV, HeII, OVI, [OIII], and CIII]. Their FWHM line widths have a range of ~700-2300 km/s with an average of approximately ~1500 km/s. The emitting gas is metal rich (Z ~2.5-3 Z_solar). In the X-ray spectrum of 130 counts in the 0.5-7 keV band there is evidence for intrinsic absorption with N_H > 10^{24} cm^{-2}. An iron K_alpha line with rest frame energy and equivalent width of ~6.4 keV and ~1 keV, respectively, in agreement with the obscuration scenario, is detected at a 2sigma level. If confirmed by our forthcoming XMM observations this would be the highest redshift detection of FeK_alpha. Depending on the assumed cosmology and the X-ray transfer model, the 2-10 keV rest frame luminosity corrected for absorption is ~10^{45 +- 0.5} ergs/s, which makes our source a classic example of the long sought Type 2 QSOs. From standard population synthesis models, these sources are expected to account for a relevant fraction of the black-hole-powered QSO distribution at high redshift.
dc.description24 LaTeX pages including 6 postscript figures. Revised version, accepted by ApJ
dc.identifierhttps://arxiv.org/abs/astro-ph/0103198
dc.identifierhttp://arxiv.org/abs/astro-ph/0103198
dc.identifierAstrophys.J.571:218-225,2002
dc.identifierdoi:10.1086/339855
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/189992
dc.subjectAstrophysics
dc.titleA Classic Type 2 QSO
dc.typetext

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