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Red and blue shifts near compact objects

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Abstract

We show that radiation emitted from material falling toward a black hole or neutron star can be blue-shifted as well as red-shifted. Although the red shift can be arbitrarily large near a black hole, there is an upper limit for the blue shift of 1/2. Material incident toward the poles of a magnetic neutron star can simultaneously radiate red and blue-shifted lines. Near an oblique magnetic rotator, the red and blue shifts will show a sinusoidal variation. Such spectral variations are associated with SS 433.

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Cohen, J.M., Struble, M.F. Red and blue shifts near compact objects. Astrophys Space Sci 73, 507–511 (1980). https://doi.org/10.1007/BF00642428

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Keywords

  • Radiation
  • Black Hole
  • Neutron Star
  • Blue Shift
  • Compact Object