The Morphology of Luminous Infrared Galaxies as a Function of Infrared Luminosity

Details The Morphology of Luminous Infrared Galaxies as a Function of Infrared Luminosity The Morphology of Luminous Infrared Galaxies as a Function of Infrared Luminosity

May 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007aas...210.1208i&link_type=abstract

American Astronomical Society Meeting 210, #12.08; Bulletin of the American Astronomical Society, Vol. 39, p.110

Astronomy and Astrophysics

Astronomy

Scientific paper

New wide-field optical (BVI) imaging of a complete sample of luminous infrared galaxies (LIGs) with log LIR 11.1 - 11.9 from the all sky IRAS Revised Bright Galaxy Sample show that all LIGs above log LIR = 11.5 have tidal tails and isophotal distortions characteristic of mergers. By sampling the transition region between the highest luminosity normal galaxies and ultraluminous infrared galaxies (ULIGs: log LIR >12.0), over 90% of which are advanced mergers, we confirm that IR luminous merger systems are dominated by pairs of disk galaxies with a combined luminosity of 2.5 L* in B-band. The systematic decrease in nuclear separation with increasing LIR and the continuity and homogeneity of global photometric properties of LIGs and ULIGs suggests that changes in the properties of LIGs as a function of LIR above log LIR 11.5 are largely due to changes along a merger time sequence for pairs of molecular gas-rich galaxies. Below log LIR 11.5, we find a small contribution from isolated disk galaxies representing the bright tail in the IR luminosity distribution of normal galaxies, and a distinct population of smaller isolated disk galaxies.

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