A survey of the distribution of lambda 2.8 CM radio continuum in nearby galaxies. IV - NGC 253

Details A survey of the distribution of lambda 2.8 CM radio continuum in nearby galaxies. IV - NGC 253 A survey of the distribution of lambda 2.8 CM radio continuum in nearby galaxies. IV - NGC 253

Oct 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983a%26a...127..177k&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 127, no. 1, Oct. 1983, p. 177-185.

Astronomy and Astrophysics

Astrophysics

55

Barred Galaxies, Galactic Radio Waves, Galactic Structure, Interstellar Magnetic Fields, Linear Polarization, Radio Galaxies, Centimeter Waves, Continuous Spectra, Density Wave Model, Interstellar Gas, Nonthermal Radiation, Radiant Flux Density, Shock Waves, Thermal Emission

Scientific paper

The nearby spiral galaxy NGC 253 has been observed at 10.7 GHz with 1.2 arcmin angular resolution both in total intensity and linear polarization. The results are discussed in terms of spiral structure and star forming processes, and in terms of the magnetic field geometry in relation to the gas dynamics in the disk. The radio morphology exhibits three major components: a central source contributing about half the total flux density, an inner bright disk, and an outer faint disk. Thermal emission contributes about 20 percent to the total flux density. Analysis of the linearly polarized emission suggests that only few magnetic field lines are oriented along the spiral arms. The average degree of polarization of the nonthermal emission is 8 + or - 3 percent. Since Faraday depolarization is negligible, the low degree of polarization indicates a three-dimensional tangling of the magnetic field.

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