ar X iv : a st ro - p h / 99 07 41 7 v 1 2 9 Ju l 1 99 9 Formation of Elliptical and S 0 Galaxies by Close Encounters

ar X iv : a st ro - p h / 99 10 45 0 v 1 2 5 O ct 1 99 9 Population Synthesis of the GRB Progenitors and their Brightness and Redshift Distribution

We estimate the relativistic binaries merger rate and redshift distribution population synthesis of an ensemble of evolving close binaries. Results of such simulations definitely depend on the cosmic star formation rate history, which is different in galaxies of different types. This leads to a difference in merger rate in spiral and elliptical galaxies, which in principle can be an observation...

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 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 11 44 3 v 1 2 3 N ov 1 99 9 Shape of the Galactic Orbits in the CNOC 1 Clusters

We present an analysis of the orbital properties in 9 intermediate-redshifts cluster of the CNOC1 survey and we compare them to a control sample of 12 nearby clusters. Similar to the nearby elliptical galaxies, the bulge-dominated galaxies in clusters at redshifts ∼ 0.1 − 0.4 present orbits that are more eccentric than those for disk-dominated galaxies. However, the orbital segregation is less ...

ar X iv : a st ro - p h / 99 11 15 7 v 1 1 0 N ov 1 99 9 The Specific Frequency of Globular Clusters in Galaxies .

Variations in the number of globular clusters per unit galaxy luminosity, which is the specific frequency, and the mass of globular clusters per unit total available mass, are reviewed. Correlations with galaxy luminosity and morphology, and with the properties of the associated galactic clusters are discussed, as are the color distributions of globular cluster populations. Several models for t...