Luminosity enhancement in relativistic jets and altered luminosity functions for beamed objects

Details Luminosity enhancement in relativistic jets and altered luminosity functions for beamed objects Luminosity enhancement in relativistic jets and altered luminosity functions for beamed objects

May 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984apj...280..569u&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 280, May 15, 1984, p. 569-573. Research supported by the Royal Society of L

Mathematics

84

Light Emission, Line Of Sight, Luminosity, Functions (Mathematics), Intergalactic Media, Light Beams

Scientific paper

Due to relativistic effects, the observed emission from relativistic jets is quite different from the rest frame emission. Systematic differences between the observed and intrinsic intensities of sources in which jet phenomena are occurring are discussed. Assuming that jets have a power law luminosity function of a slope B, the observed luminosity distribution as a function of the velocity of the jet, the spectral index of the rest frame emission, and the range of angles of the jets relative to our line of sight are calculated. The results is well-approximated by two power laws, the higher luminosity end having the original power law index X and the lower luminosity end having a flattened exponent independent of B and only slightly greater than 1. A model consisting of beamed emission from a jet and unbeamed emission from a stationary central component is investigated. The luminosity functions for these two-component sources are calculated for two ranges of angles. For sources in which beaming is important, the luminosity function is much flatter. Because of this, the relative numbers of 'beamed' and 'unbeamed' sources detected on the sky depend strongly on the luminosity at which the comparison is made. Previously announced in STAR as N84-12889

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