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On the Measurement of Handedness in Fermi Large Area Telescope Data
Stockholms universitet, Nordiska institutet för teoretisk fysik (Nordita). Stockholms universitet, Naturvetenskapliga fakulteten, Institutionen för astronomi.ORCID-id: 0000-0001-6805-5794
Stockholms universitet, Nordiska institutet för teoretisk fysik (Nordita). Stockholms universitet, Naturvetenskapliga fakulteten, Institutionen för astronomi. University of Colorado, USA; Carnegie Mellon University, USA.ORCID-id: 0000-0002-7304-021X
Rekke forfattare: 32020 (engelsk)Inngår i: Astrophysical Journal, ISSN 0004-637X, E-ISSN 1538-4357, Vol. 898, nr 2, artikkel-id 124Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

A handedness in the arrival directions of high-energy photons from outside our Galaxy can be related to the helicity of an intergalactic magnetic field. Previous estimates by Tashiro et al. and Chen et al. showed a hint of a signal present in the photons observed by the Fermi Large Area Telescope (LAT). An update on the measurement of handedness in Fermi-LAT data is presented using more than 10 yr of observations. Simulations are performed to study the uncertainty of the measurements, taking into account the structure of the exposure caused by the energy-dependent instrument response and its observing profile, as well as the background from the interstellar medium. The simulations are required to accurately estimate the uncertainty and to show that previously the uncertainty was significantly underestimated. The apparent signal in the earlier analysis of Fermi-LAT data is rendered nonsignificant.

sted, utgiver, år, opplag, sider
2020. Vol. 898, nr 2, artikkel-id 124
Emneord [en]
Gamma-rays, Extragalactic magnetic fields
HSV kategori
Identifikatorer
URN: urn:nbn:se:su:diva-185441DOI: 10.3847/1538-4357/ab9744ISI: 000556895600001OAI: oai:DiVA.org:su-185441DiVA, id: diva2:1475317
Tilgjengelig fra: 2020-10-12 Laget: 2020-10-12 Sist oppdatert: 2022-02-25bibliografisk kontrollert

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Asplund, JuliaJóhannesson, GuðlaugurBrandenburg, Axel

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