VLA Observations of NGC 253: Supernova Remnants and HiiRegions at 1 Parsec Resolution
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Abstract
The edge-on starburst galaxy NGC 253 has been imaged with the VLA at wavelengths ranging from 1.3 to 20 cm, with resolutions between 1 and 15 pc. These images reveal a large number of compact radio sources embedded within the di use radio structure in the inner 200 pc of the galaxy. We have identied approximately 64 individual compact radio sources in the galaxy. Of the strongest 17 sources, for which the ux densities are high enough to measure spectral indices with moderately low errors, about half have at spectra and half have steep spectra ; this indicates that perhaps half of the individual radio sources are dominated by thermal radio emission from H II regions. Over an 8 yr timescale, few, if any, of the strongest sources have varied in ux density, with limits of 1%2% yr~1 on the rate of decrease. At the highest resolution of 1 pc, a number of radio sources are beginning to be resolved, and at least 15 di erent sources can be identied within the innermost 20 pc of the galaxy.
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