Astronomy and Astrophysics – Astronomy
Scientific paper
Aug 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991apj...377..403c&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 377, Aug. 20, 1991, p. 403-416. Research supported by A. Della Riccia Found
Astronomy and Astrophysics
Astronomy
47
Bl Lacertae Objects, Plasma Jets, Radio Sources (Astronomy), Relativistic Particles, X Ray Sources, Compton Effect, Light Curve, Relativistic Plasmas
Scientific paper
The average amplitude of variability of BL Lac objects is larger at higher frequencies, and the spectra in the X-ray range show a hardening with increasing intensity. This is shown to be a natural consequence of the relativistic jet model proposed by Ghisellini et al. (1985), where higher frequencies are produced nearer to the jet core. Time-dependent properties are computed assuming that a perturbation travels at fixed speed down the jet, producing enhancements of constant amplitude of the relativistic particle density and of the magnetic field, in a slab of self-similar cone geometry. The time-dependent spectral intensities due to synchrotron radiation and first-order Compton scattering are computed numerically, and approximate analytic formulae are given. The evolution of the spectral shape with time and the light curves at fixed frequencies are presented and discussed in detail.
Celotti Annalisa
Maraschi Laura
Treves Aldo
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