Astronomy and Astrophysics – Astronomy
Scientific paper
Aug 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993apj...413l..23k&link_type=abstract
Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 413, no. 1, p. L23-L26.
Astronomy and Astrophysics
Astronomy
27
Angular Resolution, Galactic Nuclei, Infrared Radiation, Infrared Sources (Astronomy), Radio Sources (Astronomy), Radio Spectra, Starburst Galaxies, Cyclic Hydrocarbons, H Ii Regions, Interstellar Matter, Spiral Galaxies, Supernovae
Scientific paper
We present high angular resolution narrow-band images of the nucleus of NGC 253 at three wavelengths in the mid-infrared. We find that most of the mid-IR flux in the nucleus of NGC 253 derives from a very small region less than 120 pc in diameter. Within this small region there are three spatially and spectrally distinct IR components: two bright compact sources, and a surrounding envelope of low-level, diffuse emission. The mid-IR and 6 cm radio are loosely correlated in position but not in brightness. The implication is that the mid-IR-radio correlation may begin to break down on small spatial scales relevant to individual star-forming regions and large individual sources. These variations in the mid-IR spectra and in the radio-IR correlation imply that the nuclear emission is excited by more than one mechanism and source type.
Arens John
Ball Roger
Graham James
Jernigan Garrett
Keto Eric
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