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26 April 2024 |
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Are Quasar Jets Matter or Poynting Flux Dominated? | | Marek Sikora
; Greg M. Madejski
; Jean-Pierre Lasota
; Mitchell C. Begelman
; | | Date: |
22 Sep 2005 | | Subject: | astro-ph | | Affiliation: | CAMK), Greg M. Madejski (SLAC, KIPAC), Jean-Pierre Lasota (IAP) and Mitchell C. Begelman (JILA | | Abstract: | If quasar jets are accelerated by magnetic fields but terminate as matter dominated, where and how does the transition occur between the Poynting-dominated and matter-dominated regimes? To address this question, we study constraints which are imposed on the jet structure by observations at different spatial scales. We demonstrate that observational data are consistent with a scenario where the acceleration of a jet occurs within 10^{3-4} R_g. In this picture, the non-thermal flares -- important defining attributes of the blazar phenomenon - are produced by strong shocks formed in the region where the jet inertia becomes dominated by matter. Such shocks may be formed due to collisions between the portions of a jet accelerated to different velocities, and the acceleration differentiation is very likely to be related to global MHD instabilities. | | Source: | arXiv, astro-ph/0509685 | | Services: | Forum | Review | PDF | Favorites | |
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