A deep lambda 20 CM radio continuum survey of M 31

Details A deep lambda 20 CM radio continuum survey of M 31 A deep lambda 20 CM radio continuum survey of M 31

Apr 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998a%26as..129..329b&link_type=abstract

Astronomy and Astrophysics Supplement, v.129, p.329-336

Astronomy and Astrophysics

Astrophysics

21

Techniques: Interferometric, Galaxies: Individual: M 31, Galaxies: Magnetic Fields, Radio Continuum: Galaxies, Polarization

Scientific paper

We present a survey of the total and linearly polarized radio continuum emission of the Andromeda galaxy at 20 cm wavelength with the VLA-D array. 7 fields were observed with 45'' angular resolution. The missing large-scale total emission observed with the Effelsberg telescope was inserted. This survey is the most sensitive radio continuum survey of M 31 so far and the first one in linear polarization with the VLA. The total emission of M 31 comes from extended regions and point sources. Both components are concentrated in the bright ``ring'' of maximum star formation at about 10 kpc radius. Nearly half of the extended emission emerges from numerous filamentary features which are typically a few arcminutes long ( =~ 600 pc). In the field of M 31, 36 linearly polarized background sources were detected. The smallest degrees of polarization occur on the centre of the ``ring'' where the total emission is highest, hence on the spiral arms as delineated by Hα emission and OB associations. The distribution of polarization angles reveals coherent features of typically 1 kpc in extent, some of which show a relation to an OB association.

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