Dr Sheridan Lloyd sheridan.j.lloyd@durham.ac.uk
Postdoctoral Research Associate
The effect of pulsar geometry on the observed gamma-ray spectrum of millisecond pulsars
Lloyd, Sheridan J; Chadwick, Paula M; Brown, Anthony M
Authors
Professor Paula Chadwick p.m.chadwick@durham.ac.uk
Head Of Department
Dr Anthony Brown anthony.brown@durham.ac.uk
Assistant Professor
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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Copyright Statement
This is an Open Access article distributed under the terms of the Creative Commons Attribution License (https://creativecommons.org/licenses/by/4.0/), which permits unrestricted reuse, distribution, and reproduction in any medium, provided the original work is properly cited.
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