A model for the soft γ-ray variability in MeV blazars.

Details A model for the soft γ-ray variability in MeV blazars. A model for the soft γ-ray variability in MeV blazars.

Sep 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996a%26a...313..759r&link_type=abstract

Astronomy and Astrophysics, v.313, p.759-767

Astronomy and Astrophysics

Astrophysics

8

Quasars: General, Quasars: Individual: 3C 273, Shock Waves, Gamma Rays: Theory

Scientific paper

Recent observations with the COMPTEL instrument on the Compton Gamma Ray Observatory (CGRO) have revealed that several blazar-type sources present a strong peak in the 0.75-8.0 MeV range of their emission. Moreover, at least four of these objects have displayed variability in the soft γ-ray flux over timescales of months. In this paper I present a model for such variability based on the interaction of a strong relativistic shock with density inhomogeneities in the inner pair beam of these sources. The shock increases the soft γ-emission by compression of the particle density and the consequent enhancement of the blue-shifted annihilation radiation. The shocked particles also emit synchrotron radiation producing simultaneous or quasi-simultaneous outbursts at lower frequencies. This model is applied to the well-studied quasar 3C 273, a source for which multifrequency temporal observations are available.

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