ar X iv : a st ro - p h / 96 12 15 3 v 1 1 6 D ec 1 99 6 Pre - Starbursts in Luminous IR Galaxies ?

ar X iv : a st ro - p h / 99 12 19 6 v 1 9 D ec 1 99 9 Statistical properties of local & intermediate z galaxies

Galaxy evolution during the last 9 Gyr is discussed. It can be traced back from well known present-day galaxies or directly observed for galaxies at different look back times. This requires clear and consistently matched selection criteria for galaxy samples. There is a net decrease of rest-frame, UV luminosity density, at least since z = 1. It is interpreted as an important decline of the star...

ar X iv : a st ro - p h / 98 12 32 0 v 1 1 7 D ec 1 99 8 Molecular Gas Depletion and Starbursts in Luminous Infrared

Most luminous infrared galaxies (LIGs) are closely interacting/merging systems rich in molecular gas. We study here the relationship between the stage of the galaxy-galaxy interactions, the molecular gas mass, and the star formation rate as deduced from the infrared luminosity LIR in LIGs. We find a correlation between the CO(1-0) luminosity (a measure of molecular mass M(H2)) and the projected...

ar X iv : a st ro - p h / 96 12 22 0 v 1 2 3 D ec 1 99 6 BLACK HOLES : FROM GALACTIC NUCLEI TO ELEMENTARY PARTICLES 1

We present a broad review on black holes. We analyse some of the fundamental concepts in black hole theory, the observational and theoretical status of stellar and galactic black holes, and their appearance

X iv : a st ro - p h / 96 12 22 7 v 1 2 3 D ec 1 99 6 Conditional calculus on fractal structures and its application to galaxy distribution

ar X iv : a st ro - p h / 96 12 03 1 v 1 3 D ec 1 99 6 Faint galaxies around quasars at z = 1 and gravitational lensing of distant objects

Received ; accepted – 2 – ABSTRACT Very deep imaging data of three optically luminous radio-loud quasars with redshifts between z = 0.9 and z = 1.36 are presented. The data are complete for galaxies down to R = 26. There is no evidence for excess numbers of galaxies around the quasars; foreground galaxy clusters are excluded by the data as well as clusters with richness classes greater than 1 a...