Invisible Plasma Content in Blazars? The Case of Markarian 421

Details Invisible Plasma Content in Blazars? The Case of Markarian 421 Invisible Plasma Content in Blazars? The Case of Markarian 421

2008-02-04

arxiv.org/abs/0802.0335v1

Astronomy and Astrophysics

Astrophysics

4 pages, 2 figure for the proceedings of 'Approaching Micro-Arcsecond Resolution with VSOP-2: Astrophysics and Technology' (3-

Scientific paper

Invisible plasma content in blazar jets such as protons and/or thermal electron-positron ($e^{\pm}$) pairs is explored through combined arguments of dynamical and radiative processes. By comparing physical quantities required by the internal shock model with those obtained through the observed radio-to-gamma-ray spectra for Mrk 421, we find the existence of a copious amount of invisible plasma in the jet. We speculate that the blazar sequence could arise from variations of total amount and/or blending ratio of $e^{\pm}$ pair and electron-proton plasma.

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