Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 2012
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2012aas...21942707m&link_type=abstract
American Astronomical Society, AAS Meeting #219, #427.07
Astronomy and Astrophysics
Astronomy
Scientific paper
We present radio continuum images of the nuclear starburst region in NGC 2146, at 25 frequencies between 1 and 50 GHz, using data acquired with the EVLA. Our spatial resolution of 1.5 arcseconds at all frequencies allows us to study variations in the radio continuum spectra, on scales of 100 parsecs, over the entire starburst region ( 3 kpc). We use several tools to analyze these resolved spectra, e.g. fitting simple, descriptive functions, and producing intensity-weighted images of the spectral index and curvature. We observe that the brightest peaks are predominantly flat-spectrum, whereas the faint emission in the periphery of the nuclear source is quite steep. The source emission is interpreted as a collection of unresolved HII regions and young supernova remnants, plus diffuse synchrotron from primary and secondary cosmic ray electrons. We also use these resolved spectra to investigate the composite nature of the spatially-integrated spectrum, which appears to be a featureless power-law over this frequency range.
Eilek Jean
Marvil Joshua
Owen Frazer
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