Mathematics – Logic
Scientific paper
May 2000
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000dda....31.1004b&link_type=abstract
American Astronomical Society, DDA Meeting #31, #10.04; Bulletin of the American Astronomical Society, Vol. 32, p.866
Mathematics
Logic
Scientific paper
We have examined the morphological and local environmental properties of a large sample of ultraluminous IR galaxies (ULIRGs) with the Hubble Space Telescope (HST), giving special attention to those that were previously classified as non-interacting. We find that nearly every such case does in fact show signs of tidal interaction (asymmetric distortions) or evidence for nearby companions, or both, under the scrutiny of the high-angular resolution capability of HST. The interaction frequency of ULIRGs, which has been debated in the literature to be somewhere in the range 50--100%, is actually very close to 100%. Most ULIRGs appear to be undergoing a super starburst that has been generated in a collision/merger event. Members of the sample whose IR luminosities appear to be powered predominantly by a QSO, and thus not dominated by an interaction-induced super starburst, are also found to have faint nearby companions. Most of these companions are very close to the QSO and thus require the subarcsecond resolution of HST for PSF-separation, detection, and verification. (This research was supported under NASA grant number GO-06346.01-95A from the Space Telescope Science Institute, which is operated by AURA, Inc., under NASA contract NAS5-26555.)
Borne Kirk D.
Bushouse Howard
Colina Luis
Lucas Ray A.
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