Intrinsic Absorption in the HST Archive II: Partial Covering and Associated O VI Systems

Details Intrinsic Absorption in the HST Archive II: Partial Covering and Associated O VI Systems Intrinsic Absorption in the HST Archive II: Partial Covering and Associated O VI Systems

Dec 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006aas...209.7210g&link_type=abstract

2007 AAS/AAPT Joint Meeting, American Astronomical Society Meeting 209, #72.10; Bulletin of the American Astronomical Society, V

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We present a search for quasar-intrinsic absorption-line systems in the rich archive of high-dispersion HST STIS echelle spectra. Our search consists of two parts: (1) systems with apparently diluted absorption troughs; and (2) systems appearing near the quasar redshift (``associated'' systems). In the former case, dilution of resolved troughs suggests that the background source is not fully covered by the absorbing gas, implying a vicinity near the quasar. This search is conducted in parallel with a recent similar search by Misawa et al. for intrinsic absorption at high redshift. Similar to that survey, we find strong NV absorption to be a reasonable indicator of gas with intrinsic origins. In addition, we complement the Misawa sample and previous FUSE studies with associated O VI absorption in low-redshift quasars. In spite of the close proximity of the OVI lines to the quasar redshift, we find: (1) no evidence for partial covering; and (2) little evidence that the absorption takes place near the central engine. Photoionization models of one OVI system toward HE0226-4110 suggest absorption in the host galaxy. In another OVI system toward PG1116+215, the absorption redshift matches that of galaxies in the field. This contribution is presented as a companion to another poster in which intrinsic systems are identified through time-variability. This work was supported by NASA through grant NAG5-10817.

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