Evidence for Multiple Mergers among Ultraluminous IR Galaxies

Details Evidence for Multiple Mergers among Ultraluminous IR Galaxies Evidence for Multiple Mergers among Ultraluminous IR Galaxies

Sep 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999dda....31.1304b&link_type=abstract

American Astronomical Society, DDA meeting #31, #13.04

Mathematics

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Scientific paper

We have used the Hubble Space Telescope to study a large sample of ultraluminous IR galaxies (ULIRGs). We will present a simple morphological classification scheme for ULIRGs. We find that there is very little luminosity variation (in the mean) between the classes, and that there is equal likelihood of a ULIRG being a recent merger (single) as an on-going collision (multiple). It now appears that the fraction of ULIRGs that show evidence for interaction or merging is effectively 100%. Many of the results on ULIRGs are pointing to a complicated dynamical history for this sample of galaxies. One possible explanation for this dynamical diversity is the multiple-merger model proposed by Taniguchi & Shioya (1998, ApJ, 501, L167). We present strong observational evidence for multiple mergers among a large fraction of our ULIRG sample. If this is a valid model, then ULIRGs could be the merger remnants of an earlier generation of compact groups of galaxies.

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