M81

The galaxy M81 (NGC 3031) belongs to the Hubble class SA(s)ab. Its disk is inclined by 59° with respect to the sky plane. The galaxy has a distance median value of 3.6 Mpc. M81 is famous for its well-pronouced spiral arms in gas and total radio emission, which are thought to be the result of compression of gas and magnetic fields by density waves. In contrast, the polarized radio emission emerges mainly from the interarm space.

20.5 cm

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Total Intensity at 20.5 cm (1.46 GHz), VLA, Resolution 36"×45", Krause et al. 1989

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Polarized Intensity at 20.5 cm (1.46 GHz), VLA, Resolution 36"×45", Krause et al. 1989

M81 20.5 cm 36" I

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M81 20.5 cm 36" PI

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6.2 cm

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Total Intensity at 6.2 cm (4.85 GHz), Effelsberg, Resolution 147'', Beck et al. 1985

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Polarized Intensity at 6.2 cm (4.85 GHz), Effelsberg, Resolution 147'', Beck et al. 1985

M81 6.2 cm 147" I

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M81 6.2 cm 147" PI

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Beck et al. 1985

2.8 cm

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Total Intensity at 2.8 cm (10.55 GHz), Effelsberg, Resolution 75'', Beck et al. 1985

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Polarized Intensity at 2.8 cm (10.55 GHz), Effelsberg, Resolution 75'', Beck et al. 1985