NTT images of ultraluminous infrared galaxies

Details NTT images of ultraluminous infrared galaxies NTT images of ultraluminous infrared galaxies

May 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990a%26a...231l..19m&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 231, no. 2, May 1990, p. L19-L22. Research supported by NASA and NSF.

Astronomy and Astrophysics

Astronomy

130

Galactic Structure, Infrared Sources (Astronomy), Interacting Galaxies, Luminosity, Galactic Nuclei, Quasars, Sky Surveys (Astronomy)

Scientific paper

New Technology Telescope (NTT) images of 16 southern ultraluminous infrared (LIR greater than 10 to the 12th solar luminosities) galaxies in the Local Universe (z less than 0.13) are presented. All these galaxies are strongly interacting systems showing double nuclei, wisps, and tails that are characteristic of advanced mergers. The most spectacular instance of these cosmic accidents is the 'superantenna', a system with long slender tails that extend over 500 kpc. It is concluded that ultraluminous infrared galaxies are mergers of giant spiral galaxies, and that the distinguishing features of tidal interactions in this type of galaxies become blurred at higher redshifts. The CCD images suggest the existence of a critical separation between the colliding galaxies of about 10 kpc at which the merging systems become ultraluminous in the infrared.

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