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The Magnetic Field Structure in M81

  • M. Krause
  • R. Beck
  • E. Hummel

Abstract

M81 (NGC 3031) is a nearby galaxy (d = 3.25 Mpc [1]) of Hubble type Sab with a bright central region and tightly wound spiral arms of low luminosity. The HI spiral arms follow a logarithmic spiral pattern of pitch angle −15° [2] close to the pitch angles of the optical spiral arms [3] and those of the blue light and Ha (−12°±2°, [4]). The theory of density waves has been applied successfully to explain the clear two-armed spiral structure of M81 [2,5–8].

Keywords

Pitch Angle Position Angle Faraday Rotation Neutral Line Magnetic Field Component 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Springer-Verlag Berlin Heidelberg 1987

Authors and Affiliations

  • M. Krause
    • 1
  • R. Beck
    • 1
  • E. Hummel
    • 1
  1. 1.Max-Planck-Institut für RadioastronomieBonn 1Fed. Rep. of Germany

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