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Title: Gamma-ray and radio properties of six pulsars detected by the Fermi Large Area Telescope

Abstract

Here, we report the detection of pulsed γ-rays for PSRs J0631+1036, J0659+1414, J0742-2822, J1420-6048, J1509-5850, and J1718-3825 using the Large Area Telescope on board the Fermi Gamma-ray Space Telescope (formerly known as GLAST). Although these six pulsars are diverse in terms of their spin parameters, they share an important feature: their γ-ray light curves are (at least given the current count statistics) single peaked. For two pulsars, there are hints for a double-peaked structure in the light curves. The shapes of the observed light curves of this group of pulsars are discussed in the light of models for which the emission originates from high up in the magnetosphere. We observed phases of the γ-ray light curves are and, in general, they are consistent with those predicted by high-altitude models, although we speculate that the γ-ray emission of PSR J0659+1414, possibly featuring the softest spectrum of all Fermi pulsars coupled with a very low efficiency, arises from relatively low down in the magnetosphere. High-quality radio polarization data are available showing that all but one have a high degree of linear polarization. Furthermore, this allows us to place some constraints on the viewing geometry and aids the comparison of the γ-ray lightmore » curves with high-energy beam models.« less

Authors:
 [1]
  1. Commonwealth Scientific and Industrial Research Organization (CSIRO), Epping, NSW (Australia); Univ. of Manchester (United Kingdom); et al.
Publication Date:
Research Org.:
SLAC National Accelerator Lab., Menlo Park, CA (United States)
Sponsoring Org.:
USDOE
Contributing Org.:
Fermi LAT Collaboration
OSTI Identifier:
1357590
Grant/Contract Number:  
AC02-76SF00515
Resource Type:
Accepted Manuscript
Journal Name:
Astrophysical Journal
Additional Journal Information:
Journal Volume: 708; Journal Issue: 2; Journal ID: ISSN 0004-637X
Publisher:
Institute of Physics (IOP)
Country of Publication:
United States
Language:
English
Subject:
79 ASTRONOMY AND ASTROPHYSICS; pulsars: individual (PSRs J0631+1036, J0659+1414, J0742-2822, J1420-6048, J1509-5850, J1718-3825)

Citation Formats

Weltevrede, P. Gamma-ray and radio properties of six pulsars detected by the Fermi Large Area Telescope. United States: N. p., 2009. Web. doi:10.1088/0004-637X/708/2/1426.
Weltevrede, P. Gamma-ray and radio properties of six pulsars detected by the Fermi Large Area Telescope. United States. doi:10.1088/0004-637X/708/2/1426.
Weltevrede, P. Tue . "Gamma-ray and radio properties of six pulsars detected by the Fermi Large Area Telescope". United States. doi:10.1088/0004-637X/708/2/1426. https://www.osti.gov/servlets/purl/1357590.
@article{osti_1357590,
title = {Gamma-ray and radio properties of six pulsars detected by the Fermi Large Area Telescope},
author = {Weltevrede, P.},
abstractNote = {Here, we report the detection of pulsed γ-rays for PSRs J0631+1036, J0659+1414, J0742-2822, J1420-6048, J1509-5850, and J1718-3825 using the Large Area Telescope on board the Fermi Gamma-ray Space Telescope (formerly known as GLAST). Although these six pulsars are diverse in terms of their spin parameters, they share an important feature: their γ-ray light curves are (at least given the current count statistics) single peaked. For two pulsars, there are hints for a double-peaked structure in the light curves. The shapes of the observed light curves of this group of pulsars are discussed in the light of models for which the emission originates from high up in the magnetosphere. We observed phases of the γ-ray light curves are and, in general, they are consistent with those predicted by high-altitude models, although we speculate that the γ-ray emission of PSR J0659+1414, possibly featuring the softest spectrum of all Fermi pulsars coupled with a very low efficiency, arises from relatively low down in the magnetosphere. High-quality radio polarization data are available showing that all but one have a high degree of linear polarization. Furthermore, this allows us to place some constraints on the viewing geometry and aids the comparison of the γ-ray light curves with high-energy beam models.},
doi = {10.1088/0004-637X/708/2/1426},
journal = {Astrophysical Journal},
number = 2,
volume = 708,
place = {United States},
year = {2009},
month = {12}
}

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