Compact Groups of Galaxies

@inproceedings{Hickson1997CompactGO,
  title={Compact Groups of Galaxies},
  author={Paul Hickson},
  year={1997}
}
▪ 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 and, at the same time, are revealing unexpected new clues about the nature and role of these systems. Most compact groups contain a high fraction of galaxies having morphological or kinematical peculiarities, nuclear radio and infrared emission, and starburst or active galactic nuclei (AGN) activity. They contain large… 

Figures from this paper

Compact Groups of Galaxies: Evolution of the Stellar Population
We present a study focusing on the nature of compact groups (CGs) through the study of their elliptical (E) galaxies. Parameters describing the internal dynamics and the stellar populations of the
The Properties of Fossil Groups of Galaxies
Numerical simulations as well as optical and X-ray observations over the last few years have shown that poor groups of galaxies can evolve to what is called a fossil group. Dynamical friction as the
AGN populations in compact groups of galaxies
Abstract Compact groups of galaxies (CGG) have revealed some interesting problems from their origin and lifetime to the evolution of their members in such dense configurations. Some authors suppose
From Nearby to High Redshift Compact Group of Galaxies
Nearby Compact Groups of Galaxies (CGs) are very complex systems, tracing their history is a challenge (e.g. Stephan's Quintet). The presence of a diffuse X-rays emission that often peaks in the
Quantified diffuse light in compact groups of galaxies
The vast majority of stars in galaxy groups are contained within their constituent galaxies. Some small fraction of stars is expected, however, to follow the global dark matter potential of the
Star formation histories of southern compact groups
JoEllen McBride: Star Formation Histories of Southern Compact Groups (Under the direction of Gerald Cecil) Compact group galaxies are a common phase in galaxy evolution and provide insight into the
A COMPACT GROUP OF GALAXIES AT Z = 2.48 HOSTING AN AGN-DRIVEN OUTFLOW
We present observations of a remarkable compact group of galaxies at z = 2.48. Four galaxies, all within 40 kpc of each other, surround a powerful high-redshift radio source. This group comprises two
Ab Initio Formation of Galaxies, Groups and Large-Scale Structure
For the first time, the combination of semi-analytic modelling of galaxy formation and N-body simulations of cosmic structure formation enables us to model, at the same time, both the photometric and
On the Association of Hickson Compact Groups with Loose Groups
Counts of galaxies are made in the vicinity of Hickson compact groups (HCGs). Loose group galaxies are detected in ∼70% of nearby groups with z<0.025. It is shown that members of the loose group
STAR FORMATION SUPPRESSION IN COMPACT GROUP GALAXIES: A NEW PATH TO QUENCHING?
We present CO(1–0) maps of 12 warm H2-selected Hickson Compact Groups (HCGs), covering 14 individually imaged warm H2 bright galaxies, with the Combined Array for Research in Millimeter Astronomy. We
...
...

References

SHOWING 1-10 OF 425 REFERENCES
Hot gas and dark matter in a compact galaxy group
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 environment in the
The Structure of Compact Groups of Galaxies
Compact groups are small close isolated associations of galaxies, High space densities (≤104/Mpc3) and short crossing times (~0.1 H−1) make them particularly susceptible to dynamical evolution.
Optical Colors of Early-Type Galaxies in Compact Groups
Compact groups of galaxies with high spatial densities and low velocity dispersions are very unstable to merging. The mergers of spiral galaxies shoud be common in these environments, and if
A possible fossil galaxy group
MOST galaxies, including our own, are located in groups1. In the most compact galaxy groups, the members are separated on the sky by only a few galactic radii, and numerical simulations2 suggest that
Compact Groups of Galaxies
We discuss the history and current status of the paradoxes associated with com­ pact groups of galaxies. Dynamical theory requires that compact groups merge rap­ idly. Currently observed groups must,
Properties of dense galaxy groups and the implications of their existence
Galaxy counts are reported within 1 deg of the 100 dense groups cataloged by Hickson (1982). The results suggest that a much smaller fraction of the groups can be explained as chance alignments than
The Destruction of a Compact Group of Galaxies
The very high apparent galaxy densities in Hickson compact groups (HCGs) should produce copious amounts of galaxy-galaxy interaction, if these groups are bound dynamical units. I examine the evidence
Systematic properties of compact groups of galaxies.
One hundred compact groups of galaxies have been identified by a systematic search of the Palomar Observatory Sky Survey red prints. Each group contains four or more galaxies within a 3 mag range,
Properties of simulated compact groups of galaxies
We analyze compact groups of galaxies appearing in a galaxy formation simulation dominated by cold dark matter (0=1, baryon=0.1). The simulation uses an N-body code to model the behavior of the
Optical Properties and Dynamics of Galaxies in the Hickson Compact Groups
Broad-band R images, Hα images, and Hα long-slit spectroscopy for a set of galaxies in 21 Hickson compact groups are presented. Some of the galaxies are tidally interacting and distorted; some appear
...
...