Two-zone model for the broadband Crab nebula spectrum: microscopic interpretation
1 Depts. of Planetary Sciences and Astronomy, University of Arizona, Tucson, AZ, 85721, USA
2 DESY, 15738 Zeuthen, Germany
3 Institute of Physics and Astronomy, University of Potsdam, 14476 Potsdam, Germany
a e-mail: firstname.lastname@example.org
Published online: 23 March 2017
We develop a simple two-zone interpretation of the broadband baseline Crab nebula spectrum between 10−5 eV and ~ 100 TeV by using two distinct log-parabola energetic electrons distributions. We determine analytically the very-high energy photon spectrum as originated by inverse-Compton scattering of the far-infrared soft ambient photons within the nebula off a first population of electrons energized at the nebula termination shock. The broad and flat 200 GeV peak jointly observed by Fermi/LAT and MAGIC is naturally reproduced. The synchrotron radiation from a second energetic electron population explains the spectrum from the radio range up to ~ 10 keV. We infer from observations the energy dependence of the microscopic probability of remaining in proximity of the shock of the accelerating electrons.
© The Authors, published by EDP Sciences, 2017
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