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  • ASTRONOMY  (2)
  • 1
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    Recycled galaxies in the colliding system Arp 105 (1994)
    In:  Other Sources
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    Publication Date: 2011-08-24
    Description: Arp 105 of an infrared luminous starburst spiral being torn apart by a massive elliptical close to the center of a cluster of galaxies. The elliptical has already accreted gasrich objects and may be the precursor of a giant cD galaxy. At the tip of colossal tidal tails that emanate from the spiral we find a blue compact dwarf galacy and an irregular of Magellanic type. We propose that these small galaxies are recycled objects being formed out of the tidal debris from the spiral. In Arp 105 we observe that the collision has caused a marked spatial separation of the cold interstellar gas: more than 90% of the CO emission comes from the central region of the spiral, whereas more than 90% of the observed atomic hydrogen is situated beyond 30 kpc from the center of the spiral.
    Keywords: ASTRONOMY
    Type: Astronomy and Astrophysics (ISSN 0004-6361); 289; 1; p. 83-93
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    NTT images of ultraluminous infrared galaxies (1990)
    In:  Other Sources
    Details
    Publication Date: 2011-08-19
    Description: 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.
    Keywords: ASTRONOMY
    Type: Astronomy and Astrophysics (ISSN 0004-6361); 231; 2, Ma; L19-L22
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    NASA TECHNICAL REPORTS
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