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On the TeV Halo Fraction in gamma-ray bright Pulsar Wind Nebulae


Giacinti, G; Mitchell, A M W; Lopez-Coto, R; Jashi, V; Parsons, R D; Hinton, J A (2019). On the TeV Halo Fraction in gamma-ray bright Pulsar Wind Nebulae. arXiv.org 1907.12121, University of Zurich.

Abstract

The discovery of extended TeV emission around the Geminga and PSR B0656+14 pulsars, with properties consistent with free particlepropagation in the interstellar medium (ISM), has sparked considerable discussion on the possible presence of such halos in othersystems. Here we make an assessment of the current TeV source population associated with energetic pulsars, in terms of size andestimated energy density. Based on two alternative estimators we conclude that a large majority of the known TeV sources haveemission originating in the zone energetically and dynamically dominated by the pulsar (i.e. thepulsar wind nebula), rather than froma halo of particles diffusing in to the ISM. Furthermore, whilst the number of established halos will surely increase in the future, wefind that it is unlikely that such halos contribute significantly to the total TeVγ-ray luminosity from electrons accelerated in PWN

Abstract

The discovery of extended TeV emission around the Geminga and PSR B0656+14 pulsars, with properties consistent with free particlepropagation in the interstellar medium (ISM), has sparked considerable discussion on the possible presence of such halos in othersystems. Here we make an assessment of the current TeV source population associated with energetic pulsars, in terms of size andestimated energy density. Based on two alternative estimators we conclude that a large majority of the known TeV sources haveemission originating in the zone energetically and dynamically dominated by the pulsar (i.e. thepulsar wind nebula), rather than froma halo of particles diffusing in to the ISM. Furthermore, whilst the number of established halos will surely increase in the future, wefind that it is unlikely that such halos contribute significantly to the total TeVγ-ray luminosity from electrons accelerated in PWN

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Item Type:Working Paper
Communities & Collections:07 Faculty of Science > Physics Institute
Dewey Decimal Classification:530 Physics
Language:English
Date:28 July 2019
Deposited On:09 Jan 2020 12:36
Last Modified:16 Jan 2020 10:52
Publisher:EDP Sciences
Series Name:arXiv.org
ISSN:2331-8422
OA Status:Green
Free access at:Related URL. An embargo period may apply.
Related URLs:https://arxiv.org/abs/1907.12121

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