Pre-Starbursts in Luminous IR Galaxies ?

Details Pre-Starbursts in Luminous IR Galaxies ? Pre-Starbursts in Luminous IR Galaxies ?

1996-12-16

arxiv.org/abs/astro-ph/9612153v1

Astronomy and Astrophysics

Astrophysics

4 pages including one postscript figure. Contribution to the Conference proceedings of the 7th Annual Astrophysics Conference

Scientific paper

10.1063/1.52748

We present first results of our on-going BIMA Key Project: imaging the CO(1-0) emission from a sample of 10 luminous IR galaxies (LIRGs) that are at various merging stages, with special emphasis on systems apparently in the early/intermediate stages of merging. We present here CO images with $\sim 5''$ resolution. An important result is the recognition of a plausible pre-starburst phase in some early LIRG mergers (e.g., Arp 302 and NGC 6670). Our initial analysis suggests that a merger-induced starburst phase may not begin before the nuclear separation between the merging galaxies reaches roughly 10 kpc. The surface gas density seems to increase from a few times $10^2 \Msun pc^{-2} to >10^3 \Msun pc^{-2}$ while the prominent CO extent systematically decreases as merging progresses.

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