Astronomy and Astrophysics – Astronomy
Scientific paper
Aug 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993mnras.263..687d&link_type=abstract
Monthly Notices of the Royal Astronomical Society, Vol. 263, NO. 3/AUG1, P. 687, 1993
Astronomy and Astrophysics
Astronomy
5
Hydrodynamics - Instabilities - Radiation Mechanisms: Miscellaneous - Galaxies: Jets
Scientific paper
Previous analyses of the formation of filaments by the synchrotron-inverse-Compton thermal instability (STI) have assumed a relativistic distribution of electrons, rather than a power-law distribution as observed. In these analyses, the hypothesis of a monoenergetic spectrum does not permit determination of the true evolution of the volume emissivity as a function of the spectral luminosity in the filament. It is thus not possible to conclude whether the filaments formed by STI, such as in supernova remnants and extragalactic radio lobes and jets, are effectively bright or dark compared to the adjacent ambient region when observed at a given frequency. Since this question of the brightness of the synchrotron thermal filaments relative to the ambient medium has caused some controversy in the literature, we here abandon the assumption of a monoenergetic electron distribution and study STI by considering a power-law electron distribution obtained from the observed spectral luminosity. As an example, the data of luminosity (versus frequency), pressure and density of the inner 4O-arcsec Centaurus jet are used. Curves of volume emissivity versus frequency indicate that filaments formed by STI are brighter than the adjacent unperturbed regions for almost the entire frequency range, in agreement with observations.
de Gouveia dal Pino Elisabete M.
Opher Reuven
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