Other
Scientific paper
Oct 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004phdt........18i&link_type=abstract
Thesis (PhD). UNIVERSITY OF HAWAI'I, Source DAI-B 65/04, p. 1908, Oct 2004, 502 pages.
Other
28
Scientific paper
We have completed a deep wide-field optical B, V, and I- band imaging survey of a complete sample of 56 luminous infrared galaxies (LIGs) with log( LIR/ L&sun; ) 11.10 11.99 to understand the crucial transition in the infrared luminosity function between normal star forming disk galaxies and ultraluminous infrared galaxies (ULIGs; log(LIR/ L&sun; ) > 12.0). We find that above log(LIR/ L&sun; ) > 11.5, all LIGs are strongly interacting merger systems. Correlations between the optical properties with LIR, optical nuclear spectral type, molecular gas content, mid-infrared color, and K- band luminosity suggest that pairs of molecular gas rich galaxies of comparable size (i.e. within a factor of 3) with MB ˜ -21, MK ˜ -25; MH2 ˜ 1010.3 M&sun; are the parent population of ULIGs. For these objects, trends with increasing LIR appear to be equivalent to trends along a merger timeline. This population represents 50% of our sample. Less massive and unequal sized pairs are unlikely to reach a ULIG phase. Fully merged objects among LIGs have a mean K-band luminosity a factor of two fainter than ULIGs, indicating that they are neither pre- nor post-ULIG objects. The absence of post-ULIG objects among LIGs suggests that, after reaching a peak IR luminosity over time scales of 500 Myr, ULIGs transition into another class of object within a tenth of that time. Below log(LIR ) < 11.5, we find single molecular gas rich disk galaxies which may or may not be undergoing minor interact ions, representing the high luminosity end of normal star forming disk galaxies, and a distinct population of physically smaller apparently non- interacting isolated disk galaxies which have comparatively modest molecular gas content.
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