ar X iv : a st ro - p h / 99 12 27 7 v 1 1 4 D ec 1 99 9 Relations between the scales of length , time and mass

ar X iv : a st ro - p h / 98 12 12 1 v 1 7 D ec 1 99 8 Nuclear kpc - sized disks of spiral galaxies

A complex structure of nuclear disks of normal spiral galaxies is illustrated on the example of five galaxies, observed at 6m telescope. A problem of gravitational stability of nuclear disks is shortly discussed.

ar X iv : a st ro - p h / 98 12 16 7 v 1 9 D ec 1 99 8 LYMAN BREAK GALAXIES AT z ∼ 3 AND BEYOND

We report on the status of large surveys of photometrically selected star forming galaxies at z ∼ 3 and z ∼ 4, with particular emphasis on both the advantages and the limitations of selecting objects using the “Lyman break” technique. Current results on the luminosity functions, luminosity densities, color distribution, star formation rates, clustering properties, and the differential evolution...

ar X iv : a st ro - p h / 99 12 32 6 v 1 1 5 D ec 1 99 9 Microquasars Jochen Greiner

Microquasars are binary systems in our Galaxy which sporadically eject matter at relativistic speeds along bipolar jets. While phenomenologically similar to quasars, their vicinity allows much more in-depth studies. I review the observational aspects of microquasars, in particular the new developments on the interplay between accretion disk instabilities and jet ejection.

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 / 99 04 24 4 v 1 1 9 A pr 1 99 9 Is SGR 1900 + 14 a Magnetar ?

We present RXTE observations of the soft gamma–ray repeater SGR