Red and blue shifts near compact objects |
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Authors: | Jeffrey M Cohen Mitchell F Struble |
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Institution: | (1) Department of Physics, University of Pennsylvania, Philadelphia, PA, USA;(2) Department of Astronomy and Astrophysics, University of Pennsylvania, Philadelphia, PA, USA |
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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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