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HI and H2 in Luminous Interacting Galaxies

Scoville, N. and Hibbard, J. E. and Yun, M. S. and Van Gorkom, J. H. (1994) HI and H2 in Luminous Interacting Galaxies. In: Mass-Transfer Induced Activity in Galaxies. Cambridge University Press , Cambridge, pp. 191-212. ISBN 9780511564789. http://resolver.caltech.edu/CaltechAUTHORS:20181114-150309926

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Abstract

The interstellar gas plays a fundamental role in the interacting galaxy systems: it is dissipative and thus responds irreversibly to strong dynamical perturbations; it is also the active component which fuels starbursts and may fuel AGNs in the central regions of the galaxies. In this article we review new high resolution aperture synthesis observations of the atomic and molecular gas in luminous interacting galaxies. Due to the extended nature of the atomic gas in disk galaxies, the HI observations bear most critically on the long range tidal perburbations and therefore serve to elucidate the interaction history. Here we summarize the HI observations of six systems: the M81/M82 group and five interacting pairs with long tidal tails. In all of these systems the impact of geometry is evident from the spatial and kinematic structure of the atomic gas within the extended tidal features. The six systems may be crudely placed in a temporal sequence for galactic merging — in the early stages large amounts of HI still exist within the galactic disks and the star formation is spread throughout the disks as evidenced by Hα emission while in the final stages the HI is almost entirely contained within the tidal features beyond the merger body and the molecular gas is mostly found in the central remnant. Molecular line observations have largely concentrated on the intermediate evolutionary phase in which the galaxies become strongly emitting in the far infrared. Molecular line surveys of luminous infrared bright galaxies sampled by the IRAS survey have shown these galaxies to be extraordinarily rich in molecular gas as evidenced by the CO emission.


Item Type:Book Section
Related URLs:
URLURL TypeDescription
https://doi.org/10.1017/CBO9780511564789.046DOIArticle
ORCID:
AuthorORCID
Scoville, N.0000-0002-0438-3323
Additional Information:© 1994 Cambridge University Press.
Group:COSMOS
Record Number:CaltechAUTHORS:20181114-150309926
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:20181114-150309926
Official Citation:Scoville, N., Hibbard, J., Yun, M., & Van Gorkom, J. (1994). HI and H2 in Luminous Interacting Galaxies (Invited paper). In I. Shlosman (Ed.), Mass-Transfer Induced Activity in Galaxies (pp. 191-212). Cambridge: Cambridge University Press. doi:10.1017/CBO9780511564789.046
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:90893
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:14 Nov 2018 23:12
Last Modified:14 Nov 2018 23:12

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