The Infrared Bright Nuclei in the Mid-Infrared

Details The Infrared Bright Nuclei in the Mid-Infrared The Infrared Bright Nuclei in the Mid-Infrared

Aug 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997apj...485..598k&link_type=abstract

Astrophysical Journal v.485, p.598

Astronomy and Astrophysics

Astronomy

16

Galaxies: Individual Ngc Number: Ngc 6240, Galaxies: Individual Alphanumeric: Iras 0518-25, Galaxies: Individual Name: Arp 299, Galaxies: Nuclei, Galaxies: Starburst, Infrared: Galaxies

Scientific paper

We present arcsecond angular-resolution mid-IR images of three IR-bright galaxies, NGC 6240, IRAS 0518-25, and the NGC 3690--IC 694 (Arp 299) system, and we compare the sizes of their emission regions in the mid-IR and near-IR. In all these galaxies, most (~75%) of the mid-IR flux, as measured in the IRAS 12 mu m observations, is found in our images to be concentrated within the central few hundred parsecs. In the two galaxies which show a single IR source in the nucleus, IRAS 0518-25 and IC 694, the mid-IR emission is more compact than the near-IR. This suggests that the mid-IR source, warm dust heated by an active galactic nucleus or an unresolved starburst, is more compact than the population of cooler, older stars. In the two galaxies which show double sources in the nucleus, the reverse is the case. That is, the mid-IR is more extended than the near-IR. Similar results are obtained for a handful of other galaxies for which we have high-resolution mid-IR data. Thus in our small sample, the double source nuclei contain starbursts which are more extended than the older stars and the single source nuclei do not. Some of the double sources seen in the IR bright galaxies, for example NGC 3690, are probably starbursts in conjunction with a galactic nucleus rather than twin galactic nuclei.

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