▪ Abstract Compact groups of galaxies have posed a number of challenging questions.
Intensive observational and theoretical studies are now providing answers to many of these …

Theories of how galaxies, the fundamental constituents of large-scale structure, form and
evolve have undergone a dramatic paradigm shift in the last few decades. Earlier views …

ABSTRACT I review the radio to X‐ray properties of gigahertz peaked‐spectrum (GPS) and
compact steep‐spectrum (CSS) sources, the current hypotheses for their origin, and their …

The dynamical evolution of gravitationally bound groups of galaxies should account for
some of the objects seen in the Universe. A numerical simulation of the merging of a …

Using high-resolution cosmological N-body simulations, we investigate the survival of dark
matter satellites falling into larger haloes. Satellites preserve their identity for some time after …

We report the results of an almost complete survey of the X-ray properties of Hickson's
compact galaxy groups with the ROSAT PSPC. Diffuse X-ray emission is detected from 22 …

We study the mass function of cosmic structures that arise from gravitational instability in an
expanding Einstein-de Sitter Universe. Assuming that fragmentation processes are …

COMPACT groups of galaxies have such high apparent densities that their members are
separated in projection by only a few galactic radii, making them the most promising …

In a large sample of ultraluminous infrared galaxies (ULIRGs) imaged with the Hubble
Space Telescope, we have identified a significant subsample that shows evidence for …

In order to understand the processes that quench star formation in cluster galaxies, we
construct a library of subhalo orbits drawn from Λ cold dark matter cosmological N-body …