Radio Continuum Mapping of the Spiral Galaxy NGC 6946

Details Radio Continuum Mapping of the Spiral Galaxy NGC 6946 Radio Continuum Mapping of the Spiral Galaxy NGC 6946

Dec 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993aas...183.1903h&link_type=abstract

American Astronomical Society, 183rd AAS Meeting, #19.03; Bulletin of the American Astronomical Society, Vol. 25, p.1322

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Scientific paper

We have combined radio continuum observations of the giant spiral galaxy NGC 6946 at 20 and 6 cm made with the VLA in various array configurations, which were originally used to monitor the radio supernova SN 1980K (Weiler et al. 1986, 1992). The maps we derive from this dataset are of superior signal-to-noise (sigma ~ lt 0.04 mJy/beam at 20 cm) and spatial resolution ( ~ 4'' at 20 cm) to those previously published by other investigators. We present a preliminary atlas of individual thermal and nonthermal sources, including flux densities and spectral indices, and make a comparison with optical Hα maps (e. g., Bonnarel et al. 1986). In particular, we identify the radio counterpart to the very luminous X-ray supernova remnant (Schlegel 1993), which is ~ 2000 times more powerful than Cas A in the radio. We also give an upper limit for the large scale nonthermal cosmic ray background of the galaxy.

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