Other
Scientific paper
Jul 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008hst..prop11705h&link_type=abstract
HST Proposal ID #11705. Cycle 17
Other
Scientific paper
Accretion disk outflows are important components of quasar environments. They might play a major role in facilitating accretion, regulating star formation in the host galaxies and distributing metals to the surrounding gas. They reveal themselves most conspicuously via broad absorption lines {BALs}, but they appear even more frequently in other guises such as the weaker and narrower ``mini-BALs.'' How are these diverse outflow features related? Are mini-BALs really just ``mini'' versions of the BALs, or do they represent a fundamentally different type of outflow, with different degrees of ionization, column densities, mass loss rates, physical origins, etc.? We propose HST-COS spectroscopy to make the first quantitative assessment of the outflow physical conditions across the full range of weak/narrow mini-BALs to strong/broad BALs. Our strategy is to measure key diagnostic lines {SVI, OVI, CIII, SIV, PV, etc.} at 930A - 1130A {rest-frame} in a sample of 7 outflow quasars with known mini-BALs through weak BALs. We will then 1} combine the COS data with ground-based spectra of the same quasars to include more lines {CIV, SiIV} at longer wavelengths, and 2} include in our analysis a nearly identical UV/optical dataset obtained previously for a sample of quasars with strong BALs. Our study of this combined dataset will be an essential next step toward a more global understanding of quasar outflows.;
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