The Outbursts of Compact Radio Sources: Limitations of Compton Scattering Models and the Possibility of Pitch Angle Scattering

Details The Outbursts of Compact Radio Sources: Limitations of Compton Scattering Models and the Possibility of Pitch Angle Scattering The Outbursts of Compact Radio Sources: Limitations of Compton Scattering Models and the Possibility of Pitch Angle Scattering

Apr 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000apj...533..787b&link_type=abstract

The Astrophysical Journal, Volume 533, Issue 2, pp. 787-798.

Astronomy and Astrophysics

Astronomy

10

Galaxies: Bl Lacertae Objects: General, Galaxies: Jets, Radiation Mechanisms: Nonthermal, Radio Continuum: General, Scattering

Scientific paper

The self-consistent determination of emergent flux and electron distribution in synchrotron self-Compton (SSC) models is considered in the limit when Compton cooling dominates synchrotron cooling and the Thomson optical depth is small. An approximate analytic description is found that agrees well with numerical solutions. The results are used to evaluate the importance of Compton cooling during the initial/high frequency phase of radio outbursts in flat spectrum compact radio sources. It is concluded that the main observational features are not likely due to a Compton phase in an adiabatically expanding source. It is shown explicitly why this conclusion differs from that of earlier calculations. An alternative model is considered, in which the injected electron distribution is anisotropic. The subsequent pitch angle scattering phase is identified with the high frequency radio outburst. The salient features expected from such a model agree qualitatively with those observed. The observed burst of 3C 345 is discussed in some detail; in particular, the importance of the different time evolutions between 1990 and 1994 of the burst in the initial and late phases is stressed. It is emphasized that in order to constrain models for the outbursts of compact radio sources, detailed observations of the initial phase are essential.

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