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Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
earth and planetary sciences
Leptonic and hadronic modeling of Fermi-detected blazars
Astrophysical Journal, Volume 768, No. 1, Article 54, Year 2013
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Description
We describe new implementations of leptonic and hadronic models for the broadband emission from relativistic jets in active galactic nuclei in a temporary steady state. For the leptonic model, a temporary equilibrium between particle injection/acceleration, radiative cooling, and escape from a spherical emission region is evaluated, and the self-consistent radiative output is calculated. For the hadronic model, a temporary equilibrium between particle injection/acceleration, radiative and adiabatic cooling, and escape is evaluated for both primary electrons and protons. A new, semianalytical method to evaluate the radiative output from cascades initiated by internal γγ pair production is presented. We use our codes to fit snapshot spectral energy distributions (SEDs) of a representative set of Fermi-LAT-detected blazars. We find that the leptonic model provides acceptable fits to the SEDs of almost all blazars with parameters close to equipartition between the magnetic field and the relativistic electron population. However, the hard γ-ray spectrum of AO 0235+164, in contrast to the very steep IR-optical-UV continuum, poses a severe problem for the leptonic model. If charge neutrality in leptonic models is provided by cold protons, the kinetic energy carried by the jet should be dominated by protons. We find satisfactory representations of the snapshot SEDs of most blazars in our sample with the hadronic model presented here. However, in the case of two quasars the characteristic break at a few GeV energies cannot be well modeled. All of our hadronic model fits require powers in relativistic protons in the range Lp ∼ 1047-1049 erg s-1. © 2013. The American Astronomical Society. All rights reserved.
Authors & Co-Authors
Boettcher, M.
South Africa, Potchefstroom
North-west University
United States, Athens
Ohio University
Reimer, Anita
Austria, Innsbruck
Universität Innsbruck
Sweeney, K.
United States, Athens
Ohio University
Prakash, A.
United States, Athens
Ohio University
Statistics
Citations: 425
Authors: 4
Affiliations: 3
Identifiers
Doi:
10.1088/0004-637X/768/1/54
ISSN:
0004637X
e-ISSN:
15384357
Research Areas
Environmental
Study Design
Cross Sectional Study