IR observations of the peculiar galaxy Arp220

Details IR observations of the peculiar galaxy Arp220 IR observations of the peculiar galaxy Arp220

Sep 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984natur.311..237e&link_type=abstract

Nature (ISSN 0028-0836), vol. 311, Sept. 20, 1984, p. 237, 238.

Astronomy and Astrophysics

Astronomy

36

Galaxies, Infrared Astronomy, Peculiar Galaxies, Infrared Astronomy Satellite, Infrared Spectra, Starburst Galaxies, Stellar Evolution

Scientific paper

Observations of the peculiar galaxy Arp220, which has extreme IR properties, at 20, 350, and 760 microns are presented which constrain the mass and size of the emitting region of the galaxy. The mass of gas in the IR region is estimated at seven billion solar masses, probably accurate to within a factor of two. The emitting region is found to be between 0.6 and 1.7 kpc in diameter, with a molecular gas density between 100 and 2000 nucleons/cm. Under these conditions, star formation is expected to occur. Comparison of Arp220 with the starburst galaxy M82 suggests that the IR luminosity of the former arises from a starburst involving the order of 100 times as much material as that in M82.

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