A census of quasar-intrinsic absorption in the Hubble Space Telescope archive: systems from high-resolution echelle spectra

作者：Ganguly Rajib^*; Lynch Ryan S; Charlton Jane C; Eracleous Michael; Tripp Todd M; Palma Christopher; Sembach Kenneth R; Misawa Toru; Masiero Joseph R; Milutinovic Nikola; Lackey Benjamin D; Jones Therese M

来源：Monthly Notices of the Royal Astronomical Society, 2013, 435(2): 1233-1264.

DOI：10.1093/mnras/stt1366

• galaxies: active
• quasars: absorption lines
• quasars: general

We present a census of z(abs) less than or similar to 2 intrinsic (those showing partial coverage) and associated (z(abs) similar to z(em)) quasar absorption-line systems detected in the Hubble Space Telescope archive of Space Telescope Imaging Spectrograph echelle spectra. This work complements the Misawa et al. survey of 2 %26lt; z(em) %26lt; 4 quasars that selects systems using similar techniques. We confirm the existence of so-called strong N v intrinsic systems (where the equivalent width of H i Ly alpha is small compared to N v lambda 1238) presented in that work, but find no convincing cases of %26apos;strong C iv%26apos; intrinsic systems at low redshift/luminosity. Moreover, we also report on the existence of %26apos;strong O vi%26apos; systems. From a comparison of partial coverage results as a function of ion, we conclude that systems selected by the N v ion have the highest probability of being intrinsic. By contrast, the C iv and O vi ions are poor selectors. Of the 30 O vi systems tested, only two of the systems in the spectrum on 3C 351 show convincing evidence for partial coverage. However, there is an similar to 3 Sigma excess in the number of absorbers near the quasar redshift (vertical bar delta v vertical bar %26lt; 5000 km s(-1)) over absorbers at large redshift differences. In at least two cases, the associated O vi systems are known not to arise close to the accretion disc of the quasar.

• 出版日期2013-10