Astronomy and Astrophysics – Astrophysics
Scientific paper
2001-05-16
Astronomy and Astrophysics
Astrophysics
to appear in Mass Outflows in Active Galactic Nuclei: New Perspectives, ASP Conf. Series, eds. D. M. Crenshaw, S. B. Kraemer,
Scientific paper
We present Chandra observations of two radio-quiet QSOs, PG 2302+029 and PG 1254+047. PG 2302+029 has an ultra high-velocity UV absorption system -56,000 km/s, while PG 1254+047 is a Broad Absorption Line (BAL) QSO with detached troughs. Both objects are X-ray weak, consistent with the known correlation between alpha_ox and the strength of the UV absorption lines. The data suggest that there is evidence that both objects are intrinsically weak X-ray sources, in addition to being heavily X-ray absorbed. The X-ray absorption column densities are N_H > 10^22 cm^-2 for neutral gas and the intrinsic emission spectra have alpha_ox > 2. The data are fit best by including ionized (rather than neutral) absorbers, with column densities N_H(PG2302) > 2.98 x 10^22 cm^-2 and N_H(PG1254) > 17.3 x 10^22 cm^-2. The degrees of ionization are consistent with the UV lines, as are the total column densities if the strongest lines are saturated.
George Ian
Hamann Fred
Jannuzi Buell
Sabra Bassem M.
Shields Joseph C.
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