Multi-frequency radio continuum observations of NGC 5236 (M83)

Details Multi-frequency radio continuum observations of NGC 5236 (M83) Multi-frequency radio continuum observations of NGC 5236 (M83)

Oct 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987a%26a...184...71s&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 184, no. 1-2, Oct. 1987, p. 71-78.

Astronomy and Astrophysics

Astrophysics

26

Cosmic Rays, Galactic Radiation, Radio Emission, Radio Observation, Spiral Galaxies, Flux Density, Magnetic Field Configurations, Stellar Magnetic Fields

Scientific paper

The spiral galaxy NGC 5236 (M83) has been observed at 327 MHz, 1465 MHz, and 4750 MHz using the OSRT, VLA and Effelsberg 100-m telescope. Maps of the distributions of radio emission are presented, and a separation of total thermal and nonthermal emission based on the derived integrated flux densities is attempted. The nonthermal spectral index is αnt = -0.80, the thermal fraction at 4750 MHz is fth = 0.2, and the average spectral index in the observed frequency range is >α< = -0.75±0.04. Flux densities and spectral indices for discrete sources lying in the inner region of the galaxy are also given. The large-scale magnetic field structure of M83 is investigated for the first time by evaluating the measurements of linear polarization. A clear overall spiral configuration of the magnetic field is evident with very high degrees of polarization of up to ≡60% in the outer spiral arms. A preliminary analysis of the polarization angles indicates a bisymmetric magnetic field, with the field lines following the spiral arms of M83.

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