Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 2012
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2012aas...21924401l&link_type=abstract
American Astronomical Society, AAS Meeting #219, #244.01
Astronomy and Astrophysics
Astronomy
Scientific paper
We present new multi-configuration ATCA/CABB 3 and 6 cm radio continuum images of the nearby star-forming dwarf galaxies NGC 55 and IC 5152. The wide bandwidth (2 GHz per frequency) allows an unprecedented decomposition of thermal and non-thermal emission components on a spatially resolved basis within each galaxy. To achieve this, we image eight 256 MHz-wide segments within each frequency band, producing 16 measurements of the radio spectral energy distribution in each galaxy. Regions dominated by thermal emission are easily identified by their characteristic flat spectral indices. Regions with a mixture of thermal and non-thermal components can be identified by a comparison with H Alpha imaging. Future observations at higher frequencies will identify the break in the spectral energy distribution in such sources and eliminate the dependence on optical imaging to differentiate thermal and non-thermal radio components in nearby galaxies.
Cannon John M.
Liu Qingyang
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