Radio continuum emission from the nuclear region of M31 Evidence for a nuclear radio spiral

Details Radio continuum emission from the nuclear region of M31 Evidence for a nuclear radio spiral Radio continuum emission from the nuclear region of M31 Evidence for a nuclear radio spiral

Sep 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985a%26a...150l...1w&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 150, no. 1, Sept. 1985, p. L1-L4. ZWO-supported research.

Astronomy and Astrophysics

Astrophysics

11

Andromeda Galaxy, Continuous Spectra, Emission Spectra, Galactic Nuclei, Radio Galaxies, Spiral Galaxies, Centimeter Waves, Galactic Structure, Radiant Flux Density, Radio Spectra, Spectrum Analysis, Synchrotron Radiation

Scientific paper

New radio continuum observations of the nuclear region of M31 over a wide frequency range are presented. The highest resolution map, at 21 cm, shows evidence for spiral-like filaments associated with recently discovered features in the ionized gas distribution (Jacoby et al., 1985). These filaments have sizes of several hundred pc and probably do not lie in the plane of M31. The spectrum of the whole nuclear complex from 73.5 cm (408 MHz) down to 2.8 cm (10.7 GHz) is discussed. Although the bulk of the emission is nonthermal with spectral index -0.75 + or - 0.05 a possible thermal contribution of 25-50 percent at 2.8 cm is predicted from the optical emission line gas. If the gas is shock-ionized, the thermal radio flux may be lower. The total radio emission can be caused by supernova remnants but also by these large scale shocks. The processes occurring in the nucleus of M31 seem to be very similar to, though less violent than, those recently discovered in other spirals.

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