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Date and Time of the Query: 2019-06-25 T05:40:17 PDT
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For refcode 1990A&A...238...39G:
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Copyright by European Southern Observatory (ESO). Reproduced by permission
1990A&A...238...39G A multi-frequency radio continuum study of the galaxy M 101 R. Grave, U. Klein, and R. Wielebinski Max-Planck-Institut fur Radioastronomie, Auf dem Hugel 69, D-5300 Bonn 1, Federal Republic of Germany Received February 14, accepted May 13, 1990 Abstract. The spiral galaxy M 101 (NGC 5457) was mapped in the radio continuum at {lambda}{lambda}11.1, 6.3, 2.8, and 1.2cm with the 100-m telescope. By comparison with low-frequency WSRT data the distribution of the spectral index was derived. The separation of thermal and non-thermal emission at {lambda}2.8 cm based on this spectral index study yields a thermal distribution which is dominated by the giant H II complexes in M 101. The non-thermal emission forms a week and extremely smooth disk with no pronounced maxima. The FIR properties of M 101, if compared with the radio continuum, show that M 101 falls well within the radio-FIR correlation of galaxies. Linear radio polarization was detected for the first time in M 101 which indicates the existence of large-scale magnetic fields in this galaxy. The orientation of the E-vectors at {lambda}6.3 cm suggests an overall orientation of the magnetic field along the spiral arms. The observed variation of the polarized intensity cannot be explained in terms of the usual variation of the component of the uniform magnetic field, perpendicular to the line-of-sight, as a function of azimuthal angle in the plane of the galaxy. Key words: galaxies - radio continuum - H II regions - far-infrared, linear polarization - magnetic fields
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