Synchrotron self-Compton radiation from magnetically dominated turbulent plasmas in relativistic jets
Abstract
Relativistic jets launched by rotating black holes are powerful emitters of non-thermal radiation. Extraction of the rotational energy via electromagnetic stresses produces magnetically dominated jets, which may become turbulent. Studies of magnetically dominated plasma turbulence from first principles show that most of the accelerated particles have small pitch angles, i.e. the particle velocity is nearly aligned with the local magnetic field. We examine synchrotron self-Compton radiation from anisotropic particles in the fast cooling regime. The small pitch angles reduce the synchrotron cooling rate and promote the role of inverse Compton (IC) cooling, which can occur in two different regimes. In the Thomson regime, both synchrotron and IC components have soft spectra, νFν ∝ ν1/2. In the Klein–Nishina regime, synchrotron radiation has a hard spectrum, typically νFν ∝ ν, over a broad range of frequencies. Our results have implications for the modelling of BL Lacertae objects (BL Lacs) and gamma-ray bursts (GRBs). BL Lacs produce soft synchrotron and IC spectra, as expected when Klein–Nishina effects are minor. The observed synchrotron and IC luminosities are typically comparable, which indicates a moderate anisotropy with pitch angles θ ≳ 0.1. Rare orphan gamma-ray flares may be produced when θ $$\ll$$ 0.1. The hard spectra of GRBs may be consistent with synchrotron radiation when the emitting particles are IC cooling in the Klein–Nishina regime, as expected for pitch angles θ ~ 0.1. Blazar and GRB spectra can be explained by turbulent jets with a similar electron plasma magnetization parameter, σe ~ 104, which for electron–proton plasmas corresponds to an overall magnetization σ = (me/mp)σe ~ 10.
- Authors:
- Publication Date:
- Research Org.:
- Columbia Univ., New York, NY (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC); Simons Foundation; National Science Foundation (NSF); National Aeronautics and Space Administration (NASA)
- OSTI Identifier:
- 1806215
- Alternate Identifier(s):
- OSTI ID: 1852293
- Grant/Contract Number:
- SC0016542; PHY-1903412; 80NSSC18K1104; 2009453; 446228
- Resource Type:
- Published Article
- Journal Name:
- Monthly Notices of the Royal Astronomical Society
- Additional Journal Information:
- Journal Name: Monthly Notices of the Royal Astronomical Society Journal Volume: 506 Journal Issue: 1; Journal ID: ISSN 0035-8711
- Publisher:
- Oxford University Press
- Country of Publication:
- United Kingdom
- Language:
- English
- Subject:
- 79 ASTRONOMY AND ASTROPHYSICS; astronomy & astrophysics; plasmas; radiation mechanisms; non-thermal; turbulence; BL Lacertae objects; gamma-ray bursts
Citation Formats
Sobacchi, Emanuele, Sironi, Lorenzo, and Beloborodov, Andrei M. Synchrotron self-Compton radiation from magnetically dominated turbulent plasmas in relativistic jets. United Kingdom: N. p., 2021.
Web. doi:10.1093/mnras/stab1702.
Sobacchi, Emanuele, Sironi, Lorenzo, & Beloborodov, Andrei M. Synchrotron self-Compton radiation from magnetically dominated turbulent plasmas in relativistic jets. United Kingdom. https://doi.org/10.1093/mnras/stab1702
Sobacchi, Emanuele, Sironi, Lorenzo, and Beloborodov, Andrei M. Mon .
"Synchrotron self-Compton radiation from magnetically dominated turbulent plasmas in relativistic jets". United Kingdom. https://doi.org/10.1093/mnras/stab1702.
@article{osti_1806215,
title = {Synchrotron self-Compton radiation from magnetically dominated turbulent plasmas in relativistic jets},
author = {Sobacchi, Emanuele and Sironi, Lorenzo and Beloborodov, Andrei M.},
abstractNote = {Relativistic jets launched by rotating black holes are powerful emitters of non-thermal radiation. Extraction of the rotational energy via electromagnetic stresses produces magnetically dominated jets, which may become turbulent. Studies of magnetically dominated plasma turbulence from first principles show that most of the accelerated particles have small pitch angles, i.e. the particle velocity is nearly aligned with the local magnetic field. We examine synchrotron self-Compton radiation from anisotropic particles in the fast cooling regime. The small pitch angles reduce the synchrotron cooling rate and promote the role of inverse Compton (IC) cooling, which can occur in two different regimes. In the Thomson regime, both synchrotron and IC components have soft spectra, νFν ∝ ν1/2. In the Klein–Nishina regime, synchrotron radiation has a hard spectrum, typically νFν ∝ ν, over a broad range of frequencies. Our results have implications for the modelling of BL Lacertae objects (BL Lacs) and gamma-ray bursts (GRBs). BL Lacs produce soft synchrotron and IC spectra, as expected when Klein–Nishina effects are minor. The observed synchrotron and IC luminosities are typically comparable, which indicates a moderate anisotropy with pitch angles θ ≳ 0.1. Rare orphan gamma-ray flares may be produced when θ $\ll$ 0.1. The hard spectra of GRBs may be consistent with synchrotron radiation when the emitting particles are IC cooling in the Klein–Nishina regime, as expected for pitch angles θ ~ 0.1. Blazar and GRB spectra can be explained by turbulent jets with a similar electron plasma magnetization parameter, σe ~ 104, which for electron–proton plasmas corresponds to an overall magnetization σ = (me/mp)σe ~ 10.},
doi = {10.1093/mnras/stab1702},
journal = {Monthly Notices of the Royal Astronomical Society},
number = 1,
volume = 506,
place = {United Kingdom},
year = {Mon Jun 14 00:00:00 EDT 2021},
month = {Mon Jun 14 00:00:00 EDT 2021}
}
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