Radio continuum observations of four edge-on spiral galaxies

Astronomy and Astrophysics – Astronomy

Scientific paper

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Astronomical Maps, Continuous Spectra, Radio Emission, Radio Galaxies, Spiral Galaxies, Interstellar Magnetic Fields, Nonthermal Radiation, Radiant Flux Density, Radio Spectra, Relativistic Electron Beams, Scale Height, Southern Sky

Scientific paper

The authors present maps of the three edge-on galaxies NGC 55, 4945 and 7090 made at 843 MHz with the Molonglo Observatory Synthesis Telescope, and complete some previous analysis of the 843-MHz emission from NGC 253. Emission extends along the plane of each galaxy; the component perpendicular to the plane is resolved with a mean scale height of 0.55 kpc. The 85-MHz flux density of NGC 4945 suggests a low-frequency spectral turn-over similar to that seen for NGC 253. Scale heights of the non-thermal emission are used to investigate the z-distributions of magnetic fields and relativistic electrons and the associated diffusion rates of the electrons in NGC 55, 253 and 4945.

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