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

Rause 

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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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