ar X iv : a st ro - p h / 99 10 19 9 v 1 1 2 O ct 1 99 9 A Companion Galaxy to the Post - Starburst Quasar UN J 1025 − 0040

ar X iv : a st ro - p h / 99 10 06 5 v 1 4 O ct 1 99 9 The Interstellar Medium of Lens Galaxies

We use observations from the CASTLES survey of gravita-tional lenses to study extinction in 23 lens galaxies with 0 < z l < 1. The median differential extinction between lensed images is ∆E(B −V) = 0.05 mag, and the directly measured extinctions agree with the amount needed to explain the differences between the statistics of radio and (optical) quasar lens surveys. We also measure the first ex...

ar X iv : a st ro - p h / 99 10 26 1 v 1 1 4 O ct 1 99 9 Cluster environments around quasars at 0

We have observed the galaxy environments around two complete samples of radio-loud (steep-spectrum) and radio-quiet quasars (RLQ and RQQ) at 0.5 ≤ z ≤ 0.8 that are matched in B-luminosity, and find that the environments of both quasar populations are practically indistinguishable. A few objects are found in relatively rich clusters, but on average, they seem to prefer galaxy groups or clusters ...

ar X iv : a st ro - p h / 98 10 37 1 v 1 2 2 O ct 1 99 8 ELLIPTICAL GALAXY DYNAMICS

ar X iv : a st ro - p h / 99 02 06 2 v 1 4 F eb 1 99 9 SOURCES OF RELATIVISTIC JETS IN THE GALAXY

ar X iv : a st ro - p h / 98 01 07 4 v 1 9 J an 1 99 8 Simulating Gas at High Redshift

We discuss simulations of gas at high redshift. We briefly review the methods used and the results for quasar absorption lines. We present gas mass functions and galaxy correlation functions for 5 different cosmological models. Galaxies should be detectable at redshifts greater than 2 by SKAI, and measurements of the gas mass functions and galaxy correlation functions could be used to discrimin...