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Photon scattering in a relativistic outflow having velocity shear: a novel mechanism of generation for high energy power-law spectra

Published online by Cambridge University Press:  28 October 2024

Mukesh Kumar Vyas Open the ORCID record for Mukesh Kumar Vyas [Opens in a new window]  and
Asaf Pe’er
Mukesh Kumar Vyas*
Affiliation:
Bar Ilan University, Ramat Gan, Israel. 5290002
Asaf Pe’er
Affiliation:
Bar Ilan University, Ramat Gan, Israel. 5290002
*
email: [email protected]
Rights & Permissions [Opens in a new window]

Abstract

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. We show that an extragalactic jet with a velocity shear gives rise to Fermi like acceleration process for photons scattering withing the shear layers of the jet. Such photons then gain energy to produce a high energy power law. These power law spectra at high energies are frequently observed in several extragalactic objects such as Gamma Ray Bursts (GRBs). We implement the model on GRBs to show that the obtained range of the photon indices are well within their observed values. The analytic results are confirmed with numerical simulations following Monte Carlo approach.

Keywords

Relativistic jetsHigh energy astrophysicsGamma-ray burstsTheoretical models
Type
Contributed Paper
Information
Proceedings of the International Astronomical Union , Volume 19 , Symposium S378: Black Hole Winds at All Scales , December 2023 , pp. 100 - 103
Creative Commons
Creative Common License - CCCreative Common License - BY
This is an Open Access article, distributed under the terms of the Creative Commons Attribution licence (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted re-use, distribution and reproduction, provided the original article is properly cited.
Copyright
© The Author(s), 2024. Published by Cambridge University Press on behalf of International Astronomical Union

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