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Theory in Astrophysics
Our theoretical effort is in the areas of high energy particle production in astrophysical objects, and is closely related to the experimental work done in our department. The focus is trying to explain how such high energy particles can be produced, and involves study of objects such as: Active Galactic Nuclei, accreting neutron stars and supernova remnants.
The astrophysics theory group at the University of Adelaide is interested in modeling the multi-wavelength emissions in blazars and quasars. Detailed studies of the rapid variability and flaring in AGN, as well as of the radiation fields existing in the central AGN are also investigated; fluxes of neutrino and cosmic rays are predicted for some AGN in which protons are accelerated to ultra high energies in jets.
M87The TeV gamma-ray flux from the inner jet of M87 has recently been predicted in the context of the Synchrotron Proton Blazar (SPB) model to extend up to at least 100~GeV (Protheroe, Donea, Reimer, 2002). Subsequently, the detection of gamma-rays above 730 GeV by the HEGRA Cherenkov telescopes has been reported.
Ultra High Energy Cosmic Rays (UHECR)go
AGNgo [4415x3263, 369KB, PNG] (new window)
Relativistic Shock Accelerationgo
ICRC 2003"Cosmic rays from the nucleus of M87"
"A hadronic model for gamma-ray loud quasars"
"M 87 as a misaligned Synchrotron-Proton Blazar"
"Absorption of GeV and TeV gamma-rays in M87 and 3C273"
Proceedings of the conference on Active Galactic Nuclei: from Central Engine to Host GalaxyMeeting held in Meudon, France, July 23-27, 2002
"How relevant is the torus activity/geometry for the TeV gamma-rays emitted in the jet of M87?"
MNRAS 2003"The brightness temperature problem in extreme IDV quasars: a model for PKS 0405-385"
PASA 2002"Factors determining variability time in active galactic nucleus jets"
Astroparticle Physics 2002"TeV gamma rays and cosmic rays from the nucleus of M87, a mis-aligned BL Lac object"
MNRAS 2002"Factors determining variability time in active galactic nucleus jets"
Kluwer 2002"Small-Angle Scattering and Diffusion: Application to Relativistic Shock Acceleration"
Astroparticle Physics 2002"Radiation fields of disk, BLR and torus in quasars and blazars: implications for gamma-ray absorption"