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A Classic Type 2 QSO by Norman, C.; Hasinger, G.; Giacconi, R.; Gilli, R.; Kewley, L.; Nonino, M.; Rosati, P.; Szokoly, G.; Tozzi, P.; Wang, J.; Zheng, W.; Zirm, A.; Bergeron, J.; Gilmozzi, R.; Grogin, N.; Koekemoer, A.; Schreier, E. is a scholarly article available to read on EtoBox.

What is A Classic Type 2 QSO about?

In 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 popula

Author

Norman, C.; Hasinger, G.; Giacconi, R.; Gilli, R.; Kewley, L.; Nonino, M.; Rosati, P.; Szokoly, G.; Tozzi, P.; Wang, J.; Zheng, W.; Zirm, A.; Bergeron, J.; Gilmozzi, R.; Grogin, N.; Koekemoer, A.; Schreier, E.

Published

2001

Language

EN