Radio continuum observations of NGC 891 and NGC 253 at 8.7 GHz

Details Radio continuum observations of NGC 891 and NGC 253 at 8.7 GHz Radio continuum observations of NGC 891 and NGC 253 at 8.7 GHz

Aug 1979

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979a%26a....77...25b&link_type=abstract

Astronomy and Astrophysics, vol. 77, no. 1-2, Aug. 1979, p. 25-30.

Astronomy and Astrophysics

Astronomy

51

Continuous Spectra, Cosmic Rays, Galactic Nuclei, Galactic Radiation, Microwave Spectra, Radio Emission, Astronomical Maps, Halos, Radiant Flux Density, Radio Astronomy, Relativistic Electron Beams

Scientific paper

Maps of the radio continuum emission of the galaxies NGC 253 and NGC 891 made at 8.7 GHz with a resolution of 1.53 arcmin are presented. This is the highest radio frequency at which the large-scale structure of a normal galaxy has been mapped so far, and these data enable one to investigate the spectral index variations by comparison with published low frequency maps. Spectral indices are found to increase away from the plane in both galaxies. Faint 'thick disk' radio emission in NGC 891 is seen as far away as 6 kpc above the plane with significant steepening of the spectrum away from the plane. This distribution of the spectral index in the z-direction is in agreement with the steepening found by Allen et al. (1978). In NGC 253, in addition to the disk, a faint, extended radio emission is detected which is interpreted to be due to the diffusion of young relativistic electrons from the nucleus of this galaxy. The quasispheroidal 'halo' in NGC 253 seems to be of a different origin than the emission observed in NGC 891 and NGC 4631, and is possibly due to recent activity in the nucleus.

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