A high-resolution optical survey of interstellar absorption lines toward globular clusters and extragalactic objects. II - Further data

A status report is given on an ongoing survey of narrow-line, visual absorption components, which has been expanded to include lines of sight to the 3C 273 quasar, the nucleus of M87, and the NGC 1851, NGC 2808, and 47 Tuc globular cluster cores. The number density of components of the halo is calculated to lie between one-third and one per 100 kpc, though with substantial uncertainty. This estimate is held to be consistent with the galactic halo interpretation of the origin of high column density, quasar absorption-line systems.