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

Bar-Ilan University

Research output: Contribution to journal › 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
DOIs	https://doi.org/10.1017/S1743921323003150
State	Published - 1 Dec 2023

Keywords

Gamma-ray bursts
High energy astrophysics
Relativistic jets
Theoretical models

All Science Journal Classification (ASJC) codes

Astronomy and Astrophysics
Space and Planetary Science

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10.1017/S1743921323003150

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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'er",

note = "Publisher Copyright: {\textcopyright} The Author(s), 2024. Published by Cambridge University Press on behalf of International Astronomical Union.",

year = "2023",

month = dec,

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doi = "10.1017/S1743921323003150",

language = "الإنجليزيّة",

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journal = "Proceedings of the International Astronomical Union",

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T1 - Photon scattering in a relativistic outflow having velocity shear

T2 - a novel mechanism of generation for high energy power-law spectra

AU - Vyas, Mukesh Kumar

AU - Pe'er, Asaf

N1 - Publisher Copyright: © The Author(s), 2024. Published by Cambridge University Press on behalf of International Astronomical Union.

PY - 2023/12/1

Y1 - 2023/12/1

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.

KW - Gamma-ray bursts

KW - High energy astrophysics

KW - Relativistic jets

KW - Theoretical models

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U2 - 10.1017/S1743921323003150

DO - 10.1017/S1743921323003150

M3 - مقالة

SN - 1743-9213

VL - 19

SP - 100

EP - 103

JO - Proceedings of the International Astronomical Union

JF - Proceedings of the International Astronomical Union

ER -

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

Abstract

Keywords

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