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The effect of pulsar geometry on the observed gamma-ray spectrum of millisecond pulsars

Lloyd, Sheridan J; Chadwick, Paula M; Brown, Anthony M

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Abstract

We analyse 13 yr of Fermi Large Area Telescope Pass 8 events from 127 gamma-ray emitting millisecond pulsars (MSPs) in the energy range 0.1–100 GeV and significantly detect 118 MSPs. We fit the stacked emission with a log parabola (LP) spectral model that we show is preferred to two previously published models. We consider the influence of pulsar properties and observed geometric effects on spectral features by defining energy flux colours for both the individual MSPs, and our stacked model as a baseline. There is no correlation of colours with pulsar luminosity, E⁠, surface magnetic field, or magnetic impact angle. We also find that pulsar geometry has little effect on the observed gamma-ray spectrum, which is in tension with previous modelling of gamma-ray emission with respect to pulsar geometry. Our LP MSP model is applicable to problems where an ensemble of gamma-ray MSPs is considered, such as that of the Galactic Centre excess or in the case of emission from globular clusters.

Citation

Lloyd, S. J., Chadwick, P. M., & Brown, A. M. (2024). The effect of pulsar geometry on the observed gamma-ray spectrum of millisecond pulsars. Monthly Notices of the Royal Astronomical Society, 530(4), 3552-3569. https://doi.org/10.1093/mnras/stae1058

Journal Article Type Article
Acceptance Date Apr 15, 2024
Online Publication Date Apr 18, 2024
Publication Date 2024-06
Deposit Date Jul 4, 2024
Publicly Available Date Jul 4, 2024
Journal Monthly Notices of the Royal Astronomical Society
Print ISSN 0035-8711
Electronic ISSN 1365-2966
Publisher Royal Astronomical Society
Peer Reviewed Peer Reviewed
Volume 530
Issue 4
Pages 3552-3569
DOI https://doi.org/10.1093/mnras/stae1058
Public URL https://durham-repository.worktribe.com/output/2516872

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