Astronomy and Astrophysics – Astronomy
Scientific paper
May 1988
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988natur.333...49g&link_type=abstract
Nature (ISSN 0028-0836), vol. 333, May 5, 1988, p. 49-51. Research supported by the Smithsonian Institution and Georgia State Un
Astronomy and Astrophysics
Astronomy
26
Coronas, Cosmic Gases, Halos, Luminosity, Radio Galaxies, X Ray Astronomy, Galactic Nuclei, Hubble Constant
Scientific paper
The authors have presented an analytical model for the propagation of relativistic beams from galactic nuclei, in which the beams' crossing of the pressure-matched interface between the intergalactic medium and the gaseous halo, plays an important role. Here they extend this model to include the propagation of somewhat weaker beams. They show that the observed flattening of the local radio luminosity function (LRLF) for radio luminosity P ≈ 1024W Hz-1 at 1 GHz can be explained without invoking ad hoc a corresponding break in the beam power function Φ(Lb), because the heads of the beams with Lb < 1025W Hz-1 are decelerated to sonic velocity within the halo itself, which leads to a rapid decay of radio luminosity and a reduced contribution of these intrinsically weaker sources to the observed LRLF.
Gopal-Krishna
Wiita Paul J.
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