ar X iv : a st ro - p h / 99 06 37 2 v 2 2 9 Ju l 1 99 9 Parallax of PSR J 1744 – 1134 and the Local Interstellar Medium

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 / 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 / 96 07 14 6 v 1 2 9 Ju l 1 99 6 An Optical Ultrahigh Resolution Spectrograph for Use with Adaptive Optics

ar X iv : a st ro - p h / 01 06 39 2 v 2 1 9 Ju l 2 00 1 White Dwarfs : Contributors and Tracers of the Galactic Dark – Matter Halo

We examine the claim by Oppenheimer et al. (2001) that the local halo density of white dwarfs is an order of magnitude higher than previously thought. As it stands, the observational data support the presence of a kinematically distinct population of halo white dwarfs at the >99% confidence level. A maximum-likelihood analysis gives a radial velocity dispersion a of σ h U =150 +80 −40 km s −1 a...

ar X iv : a st ro - p h / 99 07 30 7 v 1 2 2 Ju l 1 99 9 Interstellar Dust Emission as a CMBR

This chapter discusses Galactic dust and how its thermal emission confuses CMBR measurements. Interstellar dust grains are composed of many differing species, and observational evidence has only begun to disentagle their composition and sizes. Fortunately, their far-IR/millimeter emission is less complex. We describe how a very simple two-species model can describe the emission at 200 < ν < 300...