On the Beaming Statistics of Gamma-ray Sources

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Session 15 -- AGNs II: Models
Oral presentation, Monday, June 12, 1995, 2:00pm - 3:30pm

[15.01] On the Beaming Statistics of Gamma-ray Sources

Charles D. Dermer (E. O. Hulburt Center for Space Research, Code 7653, Naval Research Laboratory, Washington, DC 20375-5352)

The beaming pattern produced by a relativistically moving blob of isotropic nonthermal electrons that Thomson-scatter photons from an external isotropic radiation field goes as ${\cal D}^{4+2\alpha}$. Here ${\cal D}$ is the Doppler factor and $\alpha$ is the energy spectral index of the radiation. This differs from the well-known beaming pattern produced by radiation emitted isotropically in the blob frame, which is $\propto {\cal D}^{3+\alpha}$. This result is important for treatments of blazar statistics, beaming constraints, and tests of gamma-ray source models.

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