Elemental Abundances from Intrinsic QSO Emission and Absorption Lines
| dc.creator | Hamann, F. | |
| dc.date | 1998-06-06 | |
| dc.date.accessioned | 2026-07-07T02:27:08Z | |
| dc.date.available | 2026-07-07T02:27:08Z | |
| dc.description | Several studies have shown that the column densities inferred from broad absorption lines (BALs) require extremely high metallicities and phosphorus overabundances -- apparently in conflict with other abundance diagnostics. Here I use HST spectroscopy of the BALQSO PG 1254+047 to argue that the BALs abundance estimates are incorrect, because partial line-of-sight coverage of the continuum source(s) has led to gross underestimates of the line optical depths and column densities. I claim that the significant presence of PV 1118,1128 absorption in this and other BALQSOs identifies the saturated absorption-line spectrum. This interpretation implies that the total column densities are at least ten times larger than previous estimates, namely log N_H(cm-2) > 22. The outflowing BAL gas, at velocities from -15,000 to -27,000 km/s in PG 1254+047, is therefore a strong candidate for the X-ray absorber in BALQSOs. If this high-column density outflow is radiately accelerated, it must originate <0.1 pc from the QSO. | |
| dc.description | 7 pages LaTeX with 2 figs. embedded | |
| dc.identifier | https://arxiv.org/abs/astro-ph/9806101 | |
| dc.identifier | http://arxiv.org/abs/astro-ph/9806101 | |
| dc.identifier.uri | http://salesiana.dossiersoluciones.com/handle/123456789/12561 | |
| dc.subject | Astrophysics | |
| dc.title | Elemental Abundances from Intrinsic QSO Emission and Absorption Lines | |
| dc.type | text |