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

Mukesh Kumar Vyas; Asaf Pe’er

doi:10.1017/s1743921323003150

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

Mukesh Kumar Vyas, Asaf Pe’er

Department of Physics - at Bar-Ilan University

Research output: Contribution to journal › Conference article › peer-review

Abstract

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.

Original language	English
Pages (from-to)	100-103
Number of pages	4
Journal	Proceedings of the International Astronomical Union
Volume	19
Issue number	378
DOIs	https://doi.org/10.1017/s1743921323003150
State	Published - 2024
Event	378th Symposium of the International Astronomical Union - Haifa, Israel Duration: 12 Mar 2023 → 16 Mar 2023

Bibliographical note

Publisher Copyright:
© The Author(s), 2024.

Keywords

Gamma-ray bursts
High energy astrophysics
Relativistic jets
Theoretical models

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10.1017/s1743921323003150License: CC BY

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

abstract = "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 = "Gamma-ray bursts, High energy astrophysics, Relativistic jets, Theoretical models",

author = "Vyas, {Mukesh Kumar} and Asaf Pe{\textquoteright}er",

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doi = "10.1017/s1743921323003150",

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PY - 2024

Y1 - 2024

N2 - 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.

AB - 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.

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Y2 - 12 March 2023 through 16 March 2023

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

Abstract

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