Astronomy and Astrophysics – Astrophysics
Scientific paper
Jul 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002hst..prop.9432w&link_type=abstract
HST Proposal ID #9432
Astronomy and Astrophysics
Astrophysics
Hst Proposal Id #9432
Scientific paper
Accretion and outflows drive astrophysical engines on many scales. In powerful QSOs, broad absorption lines {BALs} reveal partially-ionized outflows to 0.1c. What is the geometry of the flow, its origin, the driving mechanism? Why are the most extreme outflows always seen in radio-weak QSOs? Such basic questions remain unanswered. Plausibly, radiation pressure can drive an equatorial wind off the dusty torus or outer accretion disk. Are BAL QSOs seen nearly edge-on, as this scenario requires? We don't know because there is no good inclination indicator for these generally radio-weak QSOs. The bright, low-redshift QSO PKS 1004+13 may be a valuable exception. Its dominant radio lobes imply a near edge-on view, while low SNR IUE spectra suggest it is a BAL QSO. Indirect indications that it's a BAL QSO are: very weak soft X-ray flux, high scattering polarization, and unusually weak ionO3. It also shows clear high-ionization non-BAL absorption with partial continuum coverage. We propose high quality UV spectroscopy to confirm its BAL QSO identity. PKS 1004+13 would be only the second known BAL QSO with powerful radio jets, hence known inclination, providing a clear test of the outflow geometry, and the only such object at low redshift, allowing high SNR, high spatial resolution followup.
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