Physics
Scientific paper
Jul 1996
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996hst..prop.6528g&link_type=abstract
HST Proposal ID #6528
Physics
Hst Proposal Id #6528 Qso Absorption Lines
Scientific paper
In the last year, convincing empirical evidence has beenpresented that QSOs with broad absorption lines (BALs) intheir UV spectra are remarkably quiet in the soft X-raybandpass. One X-ray bright exception may exist, the QSOPG1416--129. Previous IUE UV spectra have revealed hints ofBALs, but may instead be weaker, associated absorption. Wepropose HST (FOS) spectra of signal-to-noise (S/N) ~20 in thecontinuum to resolve this question. If rather than BALs, thelines are intrinsic, associated absorption, these data willalso yield fresh insight into a poorly understood phenomenonin the interiors of QSOs. Recent studies have demonstrated,using both UV and X-ray data, that associated UV absorptionlines and soft X-ray absorption are due to the same material.The constraints provided by combining UV and X-ray datasets ispowerful for determining the physical conditions andionization state of the absorber, determined to be lowdensity, highly ionized, outflowing material situated outsidethe broad line region, similar to the BAL absorbers. Theintriguing but low S/N IUE spectra suggest that PG1416--129could prove to be a bridge between the BALQSOs and AGN withassociated absorption. Fortunately, it is also bright, andextremely well-observed in the X-ray band (via ROSAT, GINGA,and ASCA). The FOS spectra we propose will thus test newunifying models for the absorbing material deep in the nucleusof QSOs.
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