A survey of the distribution of lambda 2.8 CM radio continuum in nearby galaxies. II - NGC 6946

Details A survey of the distribution of lambda 2.8 CM radio continuum in nearby galaxies. II - NGC 6946 A survey of the distribution of lambda 2.8 CM radio continuum in nearby galaxies. II - NGC 6946

Apr 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982a%26a...108..176k&link_type=abstract

Astronomy and Astrophysics, vol. 108, no. 1, Apr. 1982, p. 176-187.

Astronomy and Astrophysics

Astronomy

99

Astronomical Maps, Centimeter Waves, Linear Polarization, Radio Astronomy, Spiral Galaxies, Angular Resolution, Continuous Spectra, Cosmic Rays, Electron Density (Concentration), Galactic Evolution, Galactic Structure, H Alpha Line, Magnetic Flux, Nonthermal Radiation, Radio Telescopes, Thermal Emission

Scientific paper

Maps of NGC 6946 in total power and linear polarization are compiled with the Effelsberg 100-m radio telescope at a wavelength of 2.8 cm (10.7 GHz). It is noted that the total power map, with 70.8 + or - 0.3 arcsec angular resolution, can be compared with maps of similar resolution made at 610 MHz with the Westerbork Synthesis Radio Telescope. The thermal and non-thermal components of the total emission are separated using the spectral index distribution. Of the total flux density, 19 + or - 10% at 2.8 cm is found to be of thermal origin. The distribution of the radio thermal emission is found to be in good agreement with the distribution of the optical H-alpha regions. It is pointed out that the nonthermal emission is distributed more smoothly than the thermal emission. The average percentage polarization of the nonthermal emission of NGC 6946 at a wavelength of 2.8 cm is 10 + or - 3%.

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