Sensitivity of the Cherenkov telescope array to the detection of intergalactic magnetic fields

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68378271%3A_____%2F16%3A00538444" target="_blank" >RIV/68378271:_____/16:00538444 - isvavai.cz</a>

Výsledek na webu

<a href="https://doi.org/10.3847/0004-637X/827/2/147" target="_blank" >https://doi.org/10.3847/0004-637X/827/2/147</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.3847/0004-637X/827/2/147" target="_blank" >10.3847/0004-637X/827/2/147</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Sensitivity of the Cherenkov telescope array to the detection of intergalactic magnetic fields

Popis výsledku v původním jazyce

Very high energy (VHE, energy E greater than or similar to 100 GeV) gamma-rays originating from extragalactic sources undergo pair production with low-energy photons of background radiation fields. These pairs can inverse-Compton-scatter background photons, initiating an electromagnetic cascade. The spatial and temporal structure of this secondary gamma-ray signal is altered as the e(+)e(-) pairs are deflected in an intergalactic magnetic field (IGMF). We investigate how VHE observations with the future Cherenkov Telescope Array, with its high angular resolution and broad energy range, can potentially probe the IGMF. We identify promising sources and simulate gamma-ray spectra over a wide range of values of the IGMF strength and coherence length using the publicly available ELMAG Monte. Carlo code. Combining simulated observations in a joint likelihood approach, we find that current limits on the IGMF can be significantly improved. The projected sensitivity depends strongly on the time a source has been gamma-ray active and on the emitted maximum gamma-ray energy.

Název v anglickém jazyce

Sensitivity of the Cherenkov telescope array to the detection of intergalactic magnetic fields

Popis výsledku anglicky

Very high energy (VHE, energy E greater than or similar to 100 GeV) gamma-rays originating from extragalactic sources undergo pair production with low-energy photons of background radiation fields. These pairs can inverse-Compton-scatter background photons, initiating an electromagnetic cascade. The spatial and temporal structure of this secondary gamma-ray signal is altered as the e(+)e(-) pairs are deflected in an intergalactic magnetic field (IGMF). We investigate how VHE observations with the future Cherenkov Telescope Array, with its high angular resolution and broad energy range, can potentially probe the IGMF. We identify promising sources and simulate gamma-ray spectra over a wide range of values of the IGMF strength and coherence length using the publicly available ELMAG Monte. Carlo code. Combining simulated observations in a joint likelihood approach, we find that current limits on the IGMF can be significantly improved. The projected sensitivity depends strongly on the time a source has been gamma-ray active and on the emitted maximum gamma-ray energy.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10303 - Particles and field physics

Projekt

—

Návaznosti

—

Rok uplatnění

2016

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

Astrophysical Journal

ISSN

0004-637X

e-ISSN

—

Svazek periodika

827

Číslo periodika v rámci svazku

2

Stát vydavatele periodika

US - Spojené státy americké

Počet stran výsledku

10

Strana od-do

1-10

Kód UT WoS článku

000384001600059

EID výsledku v databázi Scopus

2-s2.0-84984689217