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AGN jet physics and apparent opening angles

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arxiv 1301.5751 v1 pith:FH76ZIQT submitted 2013-01-24 astro-ph.HE

AGN jet physics and apparent opening angles

classification astro-ph.HE
keywords gammathetaflux-limitedjetsactiveanglesapparentgalactic
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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We present a new method to measure Gamma*theta_j in flux-limited samples of active galactic nuclei (AGN) jets, where Gamma is the bulk Lorentz factor and theta_j is the jet's half-opening angle. The Gamma*theta_j parameter is physically important for models of jet launching, and also determines the effectiveness of jet instabilities and magnetic reconnection. We measure Gamma*theta_j by analyzing the observed distribution of apparent opening angles in very long baseline interferometry (VLBI) flux-limited samples of jets, given some prior knowledge of the active galactic nuclei (AGN) radio luminosity function. We then apply this method to the MOJAVE flux-limited sample of radio loud objects and find Gamma*theta_j = 0.1 +- 0.03, which implies that AGN jets are subject to a variety of physical processes that require causal connection.

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