st ro - p h / 95 01 02 9 v 2 1 A ug 1 99 5 A Dust Lane in the Radio galaxy 3 C 270

ar X iv : a st ro - p h / 99 08 18 8 v 1 1 7 A ug 1 99 9 ISO Images of Starbursts and Active Galaxies

We present some highlights from the mid-infrared (5-16 μm) images of mergers of massive galaxies obtained with the Infrared Space Observatory (ISO). We have observed: 1) ultraluminous infrared nuclei, 2) luminous dust-enshrouded extranuclear starbursts, and 3) active galaxy nuclei (AGNs). In this contribution we discuss the observations of Arp 299, a prototype for very luminous infrared galaxie...

ar X iv : a st ro - p h / 99 01 03 7 v 1 5 J an 1 99 9 Dust and Extinction Curves in Galaxies with z > 0 : The Interstellar Medium of Gravitational Lens

We determine 37 differential extinctions in 23 gravitational lens galaxies over the range 0 < ∼ z l < ∼ 1. Only 7 of the 23 systems have spectral differences consistent with no differential extinction. The median differential extinction for the optically-selected (radio-selected) subsample is ∆E(B − V) = 0.04 (0.06) mag. The extinction is patchy and shows no correlation with impact parameter. T...

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 02 29 8 v 2 1 3 A pr 1 99 9 New limits on Ω Λ and Ω M from old galaxies at high redshift

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...