Physics
Scientific paper
Jun 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004aspc..311..243g&link_type=abstract
AGN Physics with the Sloan Digital Sky Survey, Proceedings of a conference held in Princeton, NJ, USA, 27-31 July 2003, Edited b
Physics
Scientific paper
We are in the process of searching for intrinsic low velocity-dispersion absorbers in high spectral resolution observations of quasars with HST/STIS. Our goal is to produce a catalog of truly intrinsic absorbers, selected without explicit velocity bias, using the signature of partial coverage (i.e., dilution of absorption troughs) as a selection criterion. Thus far, we have searched though the spectra of 22 quasars and have detected 75 metal-line systems. Of the 75 systems, 15 lie within {5000 km/s} of the quasar redshift (``associated'' systems). So far, we have found 8 systems that exhibit the signature of partial coverage, of which 5 are associated systems. (Not all non-associated systems have been tested yet.) We conclude that samples using velocity-selection for intrinsic absorbers are: (1) contaminated by absorbers possibly not close to the central engine, and (2) incomplete to a fair fraction of absorbers which are likely to originate close to the central engine. In addition, we point out a few interesting cases of associated O VI absorption from our survey, including a possibly new class of {H I+O VI}-only absorber.
Charlton Jane
Eracleous Michael
Ganguly Rajib
Palma Chris
Sembach Kenneth
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