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26 April 2024 |
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Pre-Starbursts in Luminous IR Galaxies ? | | Yu Gao
; Robert A. Gruendl
; K.Y. Lo
; C.Y. Hwang
; S. Veilleux
; | | Date: |
16 Dec 1996 | | Subject: | astro-ph | | Affiliation: | Lab. for Astronomical Imaging, Univ. of Illinois), C.Y. Hwang (ASIAA, Taiwan), and S. Veilleux (U. of Maryland | | Abstract: | 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. | | Source: | arXiv, astro-ph/9612153 | | Services: | Forum | Review | PDF | Favorites | |
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