The far-infrared and optical structure of ARP 220

Details The far-infrared and optical structure of ARP 220 The far-infrared and optical structure of ARP 220

Aug 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986apj...307..110j&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 307, Aug. 1, 1986, p. 110-115.

Astronomy and Astrophysics

Astronomy

39

Galactic Nuclei, Galactic Structure, Infrared Sources (Astronomy), Irregular Galaxies, Peculiar Galaxies, Astronomical Maps, Astronomical Photometry, Far Infrared Radiation, Spectral Energy Distribution, Ubv Spectra

Scientific paper

The spatial structure of the luminous peculiar galaxy Arp 220 has been investigated in the far infrared. The results reveal that most of the luminosity is from a source less than 3 kpc in extent, located in the nuclear region of the galaxy. The size constraints yield a lower limit of 0.05 for the 100 micron optical depth, implying a hydrogen column density over 5 x 10 to the 22nd/sq cm. New optical images confirm that the double-lobed optical appearance results from strong absorption across the true nucleus. Arp 220 exhibits three primary features which provide strong evidence for an external source of energy: (1) a chaotic and highly asymmetric galactic halo; (2) a large internal velocity dispersion in CO and H I; and (3) extreme compression of gas and dust. These features are natural consequences of previously proposed models which invoke a direct galactic collision and merger, and are unlikely to result from a long-range tidal interaction with the neighboring galaxy IC 4554.

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