Mathematics – Dynamical Systems
Scientific paper
Nov 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990nascp3098...93w&link_type=abstract
In NASA, Marshall Space Flight Center, Paired and Interacting Galaxies: International Astronomical Union Colloquium No. 124 p 93
Mathematics
Dynamical Systems
2
Compact Galaxies, Dynamical Systems, Galactic Clusters, H I Regions, Hydrogen, Imaging Techniques, Neutral Gases, Very Large Array (Vla), Collisions, Morphology, Sensitivity, Spatial Resolution, Tides
Scientific paper
Images of the neutral hydrogen (H I) in the direction of the compact groups of galaxies, HCG 31, HCG 44, and HCG 79 are presented. The authors find in HCG 31 and HCG 79, emission contained within a cloud much larger than the galaxies as well as the entire group. The H I emission associated with HCG 44 is located within the individual galaxies but shows definite signs of tidal interactions. The authors imaged the distribution and kinematics of neutral hydrogen at the two extremes of group sizes represented in Hickson's sample. HCG 44 is at the upper limit while HCG 18, HCG 31, and HCG 79 are at the lower end. Although the number of groups that have been imaged is still very small, there may be a pattern emerging which describes the H I morphology of compact groups. The true nature of compact groups has been the subject of considerable debate and controversy. The most recent observational and theoretical evidence strongly suggests that compact groups are physically dense, dynamical systems that are in the process of merging into a single object (Williams and Rood 1987, Hickson and Rood 1988, Barnes 1989). The neutral hydrogen deficiency observed by Williams and Rood (1987) is consistent with a model in which frequent galactic collisions and interactions have heated some of the gas during the short lifetime of the group. The H I disks which are normally more extended than the luminous ones are expected to be more sensitive to collisions and to trace the galaxy's response to recent interactions. Very Large Array observations can provide in most cases the spatial resolution needed to confirm the dynamical interactions in these systems.
McMahon Pauline Marie
van Gorkom Jacqueline H.
Williams Barbara A.
No associations
LandOfFree
VLA neutral hydrogen imaging of compact groups does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with VLA neutral hydrogen imaging of compact groups, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and VLA neutral hydrogen imaging of compact groups will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-841819