Abstract
Molecular line surveys of luminous infrared bright galaxies sampled by the IRAS survey have shown these galaxies to be extraordinarily rich in molecular gas. Optical imaging of the most luminous IRAS galaxies suggest that many have recently undergone a strong galactic interaction or merger. High resolution aperture synthesis CO data in the systems reveal massive concentrations of molecules (108 – 1010 M⊙) ususally in the galactic nuclei. The dense molecular gas is much more highly concentrated than in normal galaxies, probably a result of the viscous dissipation of energy and angular momentum in the ISM as a result of the strong dynamical perturbations. These nuclear gas concentrations are the source of nuclear starbursts, possibly also rejuvinating nuclear nonthermal activity. Interaction induced activity in the interstellar gas of galaxies may play a fundamental role in galactic evolution — leading to star formation rates elevated by at least an order of magnitude for a period ~ 2 × 108 years. Since such activity is presently occurring in approximately 2% of all spiral galaxies, it is clear that galactic interactions can be critical to both the long term stellar populations of galaxies and to the most luminous, energetic phases for galactic evolution.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
