The mid-IR radio correlation at high angular resolution: NGC253

Details The mid-IR radio correlation at high angular resolution: NGC253 The mid-IR radio correlation at high angular resolution: NGC253

Mar 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994exa.....3..161k&link_type=abstract

Experimental Astronomy, vol. 3, no. 1-4, p. 161-162

Astronomy and Astrophysics

Astronomy

1

Galactic Nuclei, Galactic Radiation, H Ii Regions, Infrared Astronomy, Infrared Spectra, Radio Astronomy, Radio Galaxies, Radio Spectra, Spiral Galaxies, Starburst Galaxies, Active Galactic Nuclei, Space Infrared Telescope Facility, Supernova Remnants

Scientific paper

We present high angular resolution (1.2 sec), narrow band (delta-lambda/lamdba 0.1) images of nucleus of NGC253 at three wavelengths in the mid-IR (8.5, 10.0, and 12.5 micrometers). We find that most of the mid-IR flux in the nucleus of NGC253 derives from a very small region less than or equal 120 pc in diameter. Within this small region there are three spatially and spectrally distant 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.

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