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

Foteini Oikonomou; Kohta Murase; Kumiko Kotera

doi:10.22323/1.301.0869

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 journal › Conference article › peer-review

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 language	English (US)
Journal	Proceedings of Science
DOIs	https://doi.org/10.22323/1.301.0869
State	Published - 2017
Event	35th International Cosmic Ray Conference, ICRC 2017 - Bexco, Busan, Korea, Republic of Duration: Jul 10 2017 → Jul 20 2017

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10.22323/1.301.0869

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@article{996ae55643044a17b0bd4257bfa6f2c6,

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",

note = "Publisher Copyright: {\textcopyright} Copyright owned by the author(s) under the terms of the Creative Commons Attribution-Non Commercial-No Derivatives 4.0 International License (CC BY-NC-ND 4.0).; 35th International Cosmic Ray Conference, ICRC 2017 ; Conference date: 10-07-2017 Through 20-07-2017",

year = "2017",

doi = "10.22323/1.301.0869",

language = "English (US)",

journal = "Proceedings of Science",

issn = "1824-8039",

publisher = "Sissa Medialab Srl",

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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

N1 - Publisher Copyright: © Copyright owned by the author(s) under the terms of the Creative Commons Attribution-Non Commercial-No Derivatives 4.0 International License (CC BY-NC-ND 4.0).

PY - 2017

Y1 - 2017

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 - https://www.scopus.com/pages/publications/85087228838

UR - https://www.scopus.com/pages/publications/85087228838#tab=citedBy

U2 - 10.22323/1.301.0869

DO - 10.22323/1.301.0869

M3 - Conference article

AN - SCOPUS:85087228838

SN - 1824-8039

JO - Proceedings of Science

JF - Proceedings of Science

T2 - 35th International Cosmic Ray Conference, ICRC 2017

Y2 - 10 July 2017 through 20 July 2017

ER -

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

Abstract

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