Time dependence of AGN pair echo, and halo emission as a probe of weak extragalactic magnetic fields

Foteini Oikonomou, Kohta Murase, Kumiko Kotera

Research output: Contribution to journalConference article

Abstract

Gamma-rays with energy exceeding 100 GeV emitted by extragalactic sources initiate cascades in the intergalactic medium. The angular and temporal distribution of the cascade photons that arrive at the Earth depend on the strength and configuration of extragalactic magnetic fields in the line of sight. For weak enough fields, extended emission around the source (halo) is expected to be detectable, and the characteristics (angular size, energy dependence, and shape) of this emission are a sensitive probe of EGMF strength and correlation length. We model the expected spectra and angular profiles of blazars in a range of parameter space of the extra-galactic magnetic field strength and correlation length, which is unconstrained by existing measurements.

Original languageEnglish (US)
JournalProceedings of Science
StatePublished - Jan 1 2017
Event35th International Cosmic Ray Conference, ICRC 2017 - Bexco, Busan, Korea, Republic of
Duration: Jul 10 2017Jul 20 2017

Fingerprint

time dependence
halos
echoes
cascades
interstellar magnetic fields
blazars
temporal distribution
intergalactic media
probes
magnetic fields
line of sight
field strength
angular distribution
gamma rays
energy
photons
profiles
configurations

All Science Journal Classification (ASJC) codes

  • General

Cite this

@article{d223b40c93714865ae5a9e8005a87857,
title = "Time dependence of AGN pair echo, and halo emission as a probe of weak extragalactic magnetic fields",
abstract = "Gamma-rays with energy exceeding 100 GeV emitted by extragalactic sources initiate cascades in the intergalactic medium. The angular and temporal distribution of the cascade photons that arrive at the Earth depend on the strength and configuration of extragalactic magnetic fields in the line of sight. For weak enough fields, extended emission around the source (halo) is expected to be detectable, and the characteristics (angular size, energy dependence, and shape) of this emission are a sensitive probe of EGMF strength and correlation length. We model the expected spectra and angular profiles of blazars in a range of parameter space of the extra-galactic magnetic field strength and correlation length, which is unconstrained by existing measurements.",
author = "Foteini Oikonomou and Kohta Murase and Kumiko Kotera",
year = "2017",
month = "1",
day = "1",
language = "English (US)",
journal = "Proceedings of Science",
issn = "1824-8039",
publisher = "Sissa Medialab Srl",

}

Time dependence of AGN pair echo, and halo emission as a probe of weak extragalactic magnetic fields. / Oikonomou, Foteini; Murase, Kohta; Kotera, Kumiko.

In: Proceedings of Science, 01.01.2017.

Research output: Contribution to journalConference article

TY - JOUR

T1 - Time dependence of AGN pair echo, and halo emission as a probe of weak extragalactic magnetic fields

AU - Oikonomou, Foteini

AU - Murase, Kohta

AU - Kotera, Kumiko

PY - 2017/1/1

Y1 - 2017/1/1

N2 - Gamma-rays with energy exceeding 100 GeV emitted by extragalactic sources initiate cascades in the intergalactic medium. The angular and temporal distribution of the cascade photons that arrive at the Earth depend on the strength and configuration of extragalactic magnetic fields in the line of sight. For weak enough fields, extended emission around the source (halo) is expected to be detectable, and the characteristics (angular size, energy dependence, and shape) of this emission are a sensitive probe of EGMF strength and correlation length. We model the expected spectra and angular profiles of blazars in a range of parameter space of the extra-galactic magnetic field strength and correlation length, which is unconstrained by existing measurements.

AB - Gamma-rays with energy exceeding 100 GeV emitted by extragalactic sources initiate cascades in the intergalactic medium. The angular and temporal distribution of the cascade photons that arrive at the Earth depend on the strength and configuration of extragalactic magnetic fields in the line of sight. For weak enough fields, extended emission around the source (halo) is expected to be detectable, and the characteristics (angular size, energy dependence, and shape) of this emission are a sensitive probe of EGMF strength and correlation length. We model the expected spectra and angular profiles of blazars in a range of parameter space of the extra-galactic magnetic field strength and correlation length, which is unconstrained by existing measurements.

UR - http://www.scopus.com/inward/record.url?scp=85046055264&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=85046055264&partnerID=8YFLogxK

M3 - Conference article

AN - SCOPUS:85046055264

JO - Proceedings of Science

JF - Proceedings of Science

SN - 1824-8039

ER -