Pre-Starbursts in Luminous Infrared Galaxies

Details Pre-Starbursts in Luminous Infrared Galaxies Pre-Starbursts in Luminous Infrared Galaxies

Dec 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996aas...189.6902l&link_type=abstract

American Astronomical Society, 189th AAS Meeting, #69.02; Bulletin of the American Astronomical Society, Vol. 28, p.1361

Astronomy and Astrophysics

Astronomy

Scientific paper

We present results of our on-going BIMA Key Project: CO imaging of luminous IR galaxies (LIRGs) in a merger sequence. We have mapped the CO(1-0) emission from a sample of 10 LIRGs that are at various merging stages, with special emphasis on systems which appear to be in the early/intermediate stages of merging. To date we have imaged these systems with ~ 5'' (typically <~ 3 kpc) resolution. An important result in our first findings is that some LIRGs in the early merging stages (e.g., Arp 302 and NGC 6670) seem to be in a pre-starburst phase. The spatial CO extent drops from ~ 20 kpc for the widely separated early mergers to typically a few kpc for the intermediate and more advanced mergers. Our initial analysis of these results implies that the starburst phase does not begin before the separation between the merging galaxies reaches roughly 10 kpc characterizing those intermediate LIRG mergers.

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