The far-infrared structure of the luminous interacting galaxy ARP 299

Details The far-infrared structure of the luminous interacting galaxy ARP 299 The far-infrared structure of the luminous interacting galaxy ARP 299

Apr 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989apj...339..100j&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 339, April 1, 1989, p. 100-105.

Astronomy and Astrophysics

Astronomy

42

Far Infrared Radiation, Galactic Structure, Interacting Galaxies, Luminosity, Star Formation, Active Galactic Nuclei, Infrared Astronomy Satellite, Radiation Distribution, Signal To Noise Ratios, Spectral Energy Distribution, Temperature Gradients

Scientific paper

The strongly interacting galaxies NGC 3690 and IC 694 (or Arp 299) exhibit extensive star formation, a large infrared luminosity, and possible nuclear activity. To determine the origin of the infrared luminosity in this system, high-resolution far-infrared profiles have been obtained in which two distinct sources can clearly be discerned; these observations reveal that 60 percent of the far-infrared luminosity comes from an unresolved source in the center of IC 694, with the remaining 40 percent originating in a compact source in NGC 3690. A new high-resolution 20-micron image of the Arp 299 system is compared with the far-infrared profiles, revealing that NGC 3690 is substantially hotter than IC 694 in the thermal infrared; the observed temperature gradient is opposite to that which is expected if the putative active nucleus in IC 694 generates a significant fraction of the total luminosity.

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