scholarly journals The Surface Density Profiles and Lensing Characteristics of Hickson Compact Groups of Galaxies

1996 ◽  
Vol 473 (2) ◽  
pp. L83-L86 ◽  
Author(s):  
M. L. Montoya ◽  
R. Domínguez-Tenreiro ◽  
G. González-Casado ◽  
G. A. Mamon ◽  
E. Salvador-Solé
Keyword(s):  
Surface Density ◽  
Compact Groups ◽  
Density Profiles ◽  
Groups Of Galaxies ◽  
Hickson Compact Groups

scholarly journals On the Nature of Compact Groups of Galaxies

2000 ◽  
Vol 174 ◽  
pp. 239-244
Author(s):  
Reinaldo R. de Carvalho
Keyword(s):  
Density Profile ◽  
Surface Density ◽  
Compact Groups ◽  
Groups Of Galaxies ◽  
Formation And Evolution ◽  
Dynamical Properties ◽  
Hickson Compact Groups

AbstractBased on the spectroscopic survey of de Carvalho et al. (1997), we analyse the structural and dynamical properties of 17 Hickson Compact Groups (HCG). This analysis probes a region of 0.5° × 0.5° around each group and shows that most are part of larger structures. Our results also suggest that the Hickson sample is composed of different dynamical stages of the group’s evolution. Specifically, we identify three possible evolutionary phases among groups in the sample: loose groups, [core+halo] systems and compact groups, each one presenting a distinct surface density profile. This sequence is consistent with the replenishment scenario for the formation and evolution of compact groups within larger and less dense systems.

Nuclear Activity in the Hickson Compact Groups of Galaxies

1999 ◽  
pp. 418-418
Author(s):  
M. Shimada ◽  
S. Nishiura ◽  
Y. Ohyama ◽  
T. Murayama ◽  
Y. Taniguchi
Keyword(s):  
Compact Groups ◽  
Nuclear Activity ◽  
Groups Of Galaxies ◽  
Hickson Compact Groups

A K-Band Luminosity Function of Hickson Compact Groups of Galaxies

1999 ◽  
pp. 415-415
Author(s):  
S. Nishiura ◽  
T. Murayama ◽  
Y. Taniguchi ◽  
Y. Sato ◽  
D. B. Sanders
Keyword(s):  
Luminosity Function ◽  
Compact Groups ◽  
Groups Of Galaxies ◽  
Hickson Compact Groups ◽  
K Band

scholarly journals MASS DISTRIBUTION IN HICKSON COMPACT GROUPS OF GALAXIES

2009 ◽  
Vol 139 (1) ◽  
pp. 1-16 ◽  
Author(s):  
H. Plana ◽  
P. Amram ◽  
C. Mendes de Oliveira ◽  
C. Balkowski
Keyword(s):  
Mass Distribution ◽  
Compact Groups ◽  
Groups Of Galaxies ◽  
Hickson Compact Groups

scholarly journals Herschelobservations of Hickson compact groups of galaxies: Unveiling the properties of cold dust

2014 ◽  
Vol 565 ◽  
pp. A25 ◽  
Author(s):  
T. Bitsakis ◽  
V. Charmandaris ◽  
P. N. Appleton ◽  
T. Díaz-Santos ◽  
E. Le Floc’h ◽  
...  
Keyword(s):  
Compact Groups ◽  
Groups Of Galaxies ◽  
Hickson Compact Groups ◽  
Cold Dust

scholarly journals FIR Infrared Emission as Indicator of Interaction in Hickson Compact Groups

2000 ◽  
Vol 174 ◽  
pp. 205-208
Author(s):  
P. Merluzzi ◽  
A. A. Shaker ◽  
G. Longo
Keyword(s):  
Infrared Emission ◽  
Spatial Density ◽  
Compact Groups ◽  
Low Velocity ◽  
Merging Galaxies ◽  
Groups Of Galaxies ◽  
Data Resolution ◽  
Galaxy Interaction ◽  
Hickson Compact Groups ◽  
Very High

Due to their very high spatial density and relatively low velocity dispersion, Hickson’s compact groups of galaxies (hereafter HCGs, Hickson et al. 1989a, H89a) are ideal test grounds where to study the physics of galaxy interaction.Tidal shocks induced by galaxy interaction are expected to trigger rapid bursts of star formation in the circumnuclear region of galaxies. The increases in density and temperature caused locally by such shocks produce an enhancement in both the total FIR luminosity and in the ratio between the FIR fluxes at 60 and 100 μm. These enhancements have been actually observed in the circumnuclear regions of both interacting and ”putative” merging galaxies and should therefore be found also in all galactic environments where the frequency of interaction is higher than in the field. However, while interactions are more frequent among HCGs members than in the field (e.g. Hickson 1994, Shaker et al. 1999), there are conflicting arguments on whether HCGs present or do not present a FIR excess. As stressed by many authors, the critical point is the IRAS data resolution which prevents to map the spatial distribution of the FIR emission. We investigate the FIR properties of a selected sample of HCGs by sing the new high spatial resolution data from Allam et al. 1996 (A96). In particular, we address the problem whether or not there is any FIR enhancement in the compact groups and the reasons of that. This is a short presentation of the analysis performed and of the results obtained (Merluzzi et al. 1999).

scholarly journals Nuclear Activity in the Hickson Compact Groups of Galaxies

1999 ◽  
Vol 186 ◽  
pp. 418-418
Author(s):  
M. Shimada ◽  
S. Nishiura ◽  
Y. Ohyama ◽  
T. Murayama ◽  
Y. Taniguchi
Keyword(s):  
Emission Line ◽  
The Other ◽  
Compact Groups ◽  
Early Type ◽  
Late Type ◽  
No Emission ◽  
Nuclear Activity ◽  
Groups Of Galaxies ◽  
Nearby Galaxies ◽  
Hickson Compact Groups

In order to study environmental effects on the nuclear activity in galaxies, we have been conducting a spectroscopic study of Hickson Compact Groups of galaxies (HCGs, Hickson 1982) which are the densest agglomeration of galaxies. We obtained nuclear spectra of 62 galaxies in 29 HCGs in the spectral range 6200–7000Å with the 188cm telescope at Okayama Astrophysical Observatory. These spectra were classified into the three types by using the emission line ratio [NII]λ6583/Hα; (1) AGN: [NII]λ6583/Hα >0.6, (2) HII nuclei: [NII]λ6583/Hα <0.6, and (3) Absorption: no emission line. We compared the nuclear activity of galaxies in HCGs with that of nearby galaxies (Ho 1996; Ho, Filippenko & Sargent 1997) which provides a representative sample of field galaxies. In early-type spirals (Sa-Sbc), the fraction of HII nuclei in HCGs is smaller than that in the field galaxies, while the fraction of absorption in HCGs is larger than that in field galaxies. On the other hand, in early-type galaxies (E-S0a) and late-type spirals (Sc-P), we found little difference in the nuclear activity between HCGs and field galaxies.

scholarly journals Disentangling the intragroup HI in Compact Groups of galaxies by means of X3D visualization

2016 ◽  
Vol 11 (S321) ◽  
pp. 241-243
Author(s):  
Lourdes Verdes-Montenegro ◽  
Frederic Vogt ◽  
Claire Aubery ◽  
Laetitie Duret ◽  
Julián Garrido ◽  
...  
Keyword(s):  
Three Dimensional ◽  
Compact Groups ◽  
Evolutionary Sequence ◽  
Groups Of Galaxies ◽  
Data Cubes ◽  
Tidal Interactions ◽  
Evolutionary Phase ◽  
Hickson Compact Groups ◽  
Access To Data ◽  
Uncertain Distribution

AbstractAs an extreme kind of environment, Hickson Compact groups (HCGs) have shown to be very complex systems. HI-VLA observations revealed an intrincated network of HI tails and bridges, tracing pre-processing through extreme tidal interactions. We found HCGs to show a large HI deficiency supporting an evolutionary sequence where gas-rich groups transform via tidal interactions and ISM (interstellar medium) stripping into gas-poor systems. We detected as well a diffuse HI component in the groups, increasing with evolutionary phase, although with uncertain distribution. The complex net of detected HI as observed with the VLA seems hence so puzzling as the missing one. In this talk we revisit the existing VLA information on the HI distribution and kinematics of HCGs by means of X3D visualization. X3D constitutes a powerful tool to extract the most from HI data cubes and a mean of simplifying and easing the access to data visualization and publication via three-dimensional (3-D) diagrams.

scholarly journals Tidal Dwarf Galaxy Candidates in Hickson Compact Groups of Galaxies

2004 ◽  
Vol 217 ◽  
pp. 566-567 ◽  
Author(s):  
Philippe Amram ◽  
Claudia Mendes de Oliveira ◽  
Henri Plana ◽  
Chantal Balkowski
Keyword(s):  
Dwarf Galaxy ◽  
Compact Groups ◽  
Groups Of Galaxies ◽  
Fabry Perot ◽  
Hickson Compact Groups ◽  
Dynamical Masses

The detailed study of the internal kinematics of tidal dwarf galaxy (TDG) candidates detected in optical and/or HI observations is most important to address the question about their origins. We are conducting a program to measure the kinematics of TDG candidates in compact groups using a Fabry-Perot instrument which allows us to study the 2-D velocity maps of the objects with high spatial and spectral resolutions. Our main goal is to select TDG candidates which have kinematics independent of the possible parent galaxies. In this paper, we describe our results for Stephan's quintet (SQ) and HCG 31. We find that the dynamical masses of the TDG candidates in SQ range from 108 up to 1010M⊙. Two objects to the E and S of HCG 31 A+C present counterrotating patterns with amplitudes of 30 and 40 km s−1. Region F, which was previously thought to be the best example of TDG presents no rotation.

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