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Highly Ionized High Velocity Clouds
Kenneth R. Sembach, Blair D. Savage, Limin Lu +1
We have recently used the Hubble Space Telescope to study a pair of high velocity clouds in the direction of Mrk 509 that have unusual ionization properties. They exhibit strong CI…
Observational evidence for the accretion of low-metallicity gas onto the Milky Way; metallicity, physical conditions and distance limit for HVC complex C
B. P. Wakker, J. C. Howk, B. D. Savage +5
We present observations of the (field of the) Seyfert galaxy Mark290, which probes the high-velocity cloud (HVC) complex C, one of the largest HVCs. We find that this object has a…
The HI fine structure of HVC187 near NGC3783, gas in the leading bridge of the Magellanic System
B. P. Wakker, B. D. Savage, T. A. Oosterloo +1
We present an analysis of high-resolution HI data of one of the cores of HVC187 Wakker & van Woerden 1991), HVC287+22+240. Structure is present down to the lowest-measurable scale…
The Deuterium Abundance at z=0.701 towards QSO 1718+4807
David Tytler, Scott Burles, Limin Lu +3
We present constraints on the deuterium to hydrogen ratio (D/H) in the metal-poor gas cloud at redshift towards QSO 1718+4807. We use new Keck spectra in addition to Hubb…
Highly Ionized High Velocity Clouds: Intergalactic Gas in the Local Group or Distant Gas in the Galactic Halo?
Kenneth R. Sembach, Blair D. Savage, Limin Lu +1
We have recently identified several high velocity (V < -100 km/s) clouds in the directions of Mrk 509 and PKS 2155-304 that have unusual ionization properties. The clouds exhibit s…
The HST Quasar Absorption Line Key Project. XIV. The Evolution of Ly-alpha Absorption Lines in the Redshift Interval 0 to 1.5
Ray J. Weymann, Buell T. Jannuzi, Limin Lu +10
We present an analysis of the evolution of the Ly alpha absorption lines in the redshift interval 0.0 to \sim 1.5 based upon a sample of 987 lines identified in the spectra of 63 Q…