Size limits for expanding light sources

Details Size limits for expanding light sources Size limits for expanding light sources

Dec 1976

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976stin...7728059t&link_type=abstract

Presented at IAU-CNRS Colloq., Paris, 6-8 Sep. 1976

Astronomy and Astrophysics

Astronomy

Light Sources, Quasars, Relativistic Theory, Radio Sources (Astronomy), Stellar Luminosity, Ultraviolet Radiation

Scientific paper

The rapid fluctuations of radio and optical brightness which are observed for quasars, as well as for BL Lac objects, place severe upper limits on the possible sizes of these sources. These limits are not essentially changed by the assumption of a relativistically-expanding light source, contrary to widespread opinion. Thus the conflicts between fluctuation size limits for quasars and the minimum surface area needed to radiate sufficient power, if at cosmological distance, are not resolved by relativistic expansion.

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