skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: GRAVITATIONAL MODEL OF HIGH-ENERGY PARTICLES IN A COLLIMATED JET

Abstract

Observations suggest that relativistic particles play a fundamental role in the dynamics of jets emerging from active galactic nuclei as well as in their interaction with the intracluster medium. However, no general consensus exists concerning the acceleration mechanism of those high-energy particles. A gravitational acceleration mechanism is proposed here in which particles leaving precise regions within the ergosphere of a rotating supermassive black hole (BH) produce a highly collimated flow. These particles follow unbound geodesics which are asymptotically parallel to the spin axis of the BH and are characterized by the energy E, the Carter constant Q, and zero angular momentum of the component L{sub z} . If environmental effects are neglected, the present model predicts the presence of electrons with energies around 9.4 GeV at distances of about 140 kpc from the ergosphere. The present mechanism can also accelerate protons up to the highest energies observed in cosmic rays by the present experiments.

Authors:
 [1]; ; ;  [2]
  1. University of Nice-Sophia Antipolis, Observatoire de la Cote d'Azur Laboratoire Lagrange, UMR 7293, BP 4229, F-06304 Nice Cedex 4 (France)
  2. LERMA-UPMC, University Pierre and Marie Curie, Observatoire de Paris CNRS, UMR 8112, 3 rue de Galilee, F-94200 Ivry sur Seine (France)
Publication Date:
OSTI Identifier:
22086360
Resource Type:
Journal Article
Journal Name:
Astrophysical Journal
Additional Journal Information:
Journal Volume: 759; Journal Issue: 2; Other Information: Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0004-637X
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; ACCELERATION; ASTRONOMY; ASTROPHYSICS; BLACK HOLES; COSMIC ELECTRONS; COSMIC PROTONS; COSMOLOGY; GALAXIES; GALAXY NUCLEI; GEODESICS; GEV RANGE; GRAVITATION; JETS; RELATIVISTIC RANGE; SPIN

Citation Formats

De Freitas Pacheco, J. A., Gariel, J., Marcilhacy, G., and Santos, N. O., E-mail: pacheco@oca.eu, E-mail: jerome.gariel@upmc.fr, E-mail: gmarcilhacy@hotmail.com, E-mail: nilton.santos@upmc.fr. GRAVITATIONAL MODEL OF HIGH-ENERGY PARTICLES IN A COLLIMATED JET. United States: N. p., 2012. Web. doi:10.1088/0004-637X/759/2/125.
De Freitas Pacheco, J. A., Gariel, J., Marcilhacy, G., & Santos, N. O., E-mail: pacheco@oca.eu, E-mail: jerome.gariel@upmc.fr, E-mail: gmarcilhacy@hotmail.com, E-mail: nilton.santos@upmc.fr. GRAVITATIONAL MODEL OF HIGH-ENERGY PARTICLES IN A COLLIMATED JET. United States. doi:10.1088/0004-637X/759/2/125.
De Freitas Pacheco, J. A., Gariel, J., Marcilhacy, G., and Santos, N. O., E-mail: pacheco@oca.eu, E-mail: jerome.gariel@upmc.fr, E-mail: gmarcilhacy@hotmail.com, E-mail: nilton.santos@upmc.fr. Sat . "GRAVITATIONAL MODEL OF HIGH-ENERGY PARTICLES IN A COLLIMATED JET". United States. doi:10.1088/0004-637X/759/2/125.
@article{osti_22086360,
title = {GRAVITATIONAL MODEL OF HIGH-ENERGY PARTICLES IN A COLLIMATED JET},
author = {De Freitas Pacheco, J. A. and Gariel, J. and Marcilhacy, G. and Santos, N. O., E-mail: pacheco@oca.eu, E-mail: jerome.gariel@upmc.fr, E-mail: gmarcilhacy@hotmail.com, E-mail: nilton.santos@upmc.fr},
abstractNote = {Observations suggest that relativistic particles play a fundamental role in the dynamics of jets emerging from active galactic nuclei as well as in their interaction with the intracluster medium. However, no general consensus exists concerning the acceleration mechanism of those high-energy particles. A gravitational acceleration mechanism is proposed here in which particles leaving precise regions within the ergosphere of a rotating supermassive black hole (BH) produce a highly collimated flow. These particles follow unbound geodesics which are asymptotically parallel to the spin axis of the BH and are characterized by the energy E, the Carter constant Q, and zero angular momentum of the component L{sub z} . If environmental effects are neglected, the present model predicts the presence of electrons with energies around 9.4 GeV at distances of about 140 kpc from the ergosphere. The present mechanism can also accelerate protons up to the highest energies observed in cosmic rays by the present experiments.},
doi = {10.1088/0004-637X/759/2/125},
journal = {Astrophysical Journal},
issn = {0004-637X},
number = 2,
volume = 759,
place = {United States},
year = {2012},
month = {11}
}