Astronomy and Astrophysics – Astronomy
Scientific paper
May 1977
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977apj...213l..93t&link_type=abstract
Astrophysical Journal, Part 2 - Letters to the Editor, vol. 213, May 1, 1977, p. L93-L97. ERDA-supported research.
Astronomy and Astrophysics
Astronomy
11
Luminous Intensity, Quasars, Radio Sources (Astronomy), Size Determination, Cosmology, Novae, Red Shift, Relativistic Velocity, Supernovae, Variable Stars, X Ray Sources
Scientific paper
It is shown that expansion at relativistic speed does not significantly change the limit on luminosity fluctuations of an astronomical source of given maximum effective radius. The effective pulse length is shown to be the same for an expanding source with a given redshift and for a source of constant size. Thus, relativistic expansion does not permit larger source sizes for given fluctuations and does not resolve the conflicts between size limits based on observed fluctuations of quasars and BL Lacertae objects and the minimum surface area needed to radiate sufficient power, if at cosmological distances. These size limits should apply with equal force to other types of fluctuating objects, such as novae, supernovae, and X-ray sources.
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