Astronomy and Astrophysics – Astrophysics
Scientific paper
Nov 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991a%26a...251l...5c&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 251, no. 1, Nov. 1991, p. L5, L6.
Astronomy and Astrophysics
Astrophysics
3
Active Galactic Nuclei, Bl Lacertae Objects, Brightness Temperature, Synchrotron Radiation, Compton Effect, Relativistic Electron Beams, Self Absorption, Very Long Base Interferometry
Scientific paper
The radiation generated in the synchrotron-self-Compton process by a peaked relativistic electron energy distribution is considered. It is found that the brightness temperature of the emission can be above 10 exp 12 K when the self-absorption occurs well below the typical synchrotron frequency, so that the energy density in the photons is reduced by a significant amount compared to the case of complete self-absorption. The results also hold for a more general family of particle distributions with low-energy cutoffs. This is in contrast to the case of a full power-law distribution, where this value cannot be exceeded. It is argued that sources with directly measured brightness temperatures in the range 1 - 4 x 10 exp 12 K possibly can be understood within the framework of this model.
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