Faster-than-light motion in quasars |
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Authors: | J V Narlikar S M Chitre |
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Institution: | (1) Tata Institute of Fundamental Research, Homi Bhabha Road, 400005 Colaba, Bombay |
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Abstract: | Over the past fifteen years, observations of some quasars with the techniques of very-long-baseline interferometry have shown
that the angular separation between pairs of radio-emitting regions in their cores is increasing year after year. If the quasars
are indeed as far away as implied by Hubble’s law, then these angular motions translate into linear speeds several times the
speed of light. Several theoretical scenarios have been proposed to show that the observed motions are illusory. The leading
contender in this field — the relativistic beam model — and an alternative offered by the concept of a gravitational screen
are described and compared in the light of recent observational data. |
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Keywords: | quasars superluminal motion relativistic beaming gravitational screen |
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