Luminous infrared galaxies - Sizes at 10-32 microns

Details Luminous infrared galaxies - Sizes at 10-32 microns Luminous infrared galaxies - Sizes at 10-32 microns

Aug 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993apj...412..535w&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 412, no. 2, p. 535-540.

Astronomy and Astrophysics

Astronomy

41

Astronomical Photometry, Compact Galaxies, Galactic Nuclei, Infrared Astronomy Satellite, Infrared Sources (Astronomy), Infrared Telescopes, Luminosity

Scientific paper

We have made estimates of the sizes of 19 infrared galaxies drawn from the highest luminosity galaxies detected by the IRAS survey. The techniques we used were to make multiaperture photometric measurements on the ground-based IR Telescope Facility and to compare these flux densities with the much broader beam measurements obtained by the IRAS survey. Our primary result is that most, but not all, of the galaxies in our sample are extended at 10-25 microns, with characteristic radii of a few hundred parsecs. This result directly supports the widely held assumption that the bulk of the infrared luminosity in these galaxies comes from a central starburst region rather than from the whole disk of the galaxy or from a compact nucleus. The compact nature of Arp 220 is confirmed by direct scans with a 2.9 arcsec aperture at 32 microns.

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