期刊
ASTROPHYSICAL JOURNAL
卷 708, 期 2, 页码 1426-1441出版社
IOP PUBLISHING LTD
DOI: 10.1088/0004-637X/708/2/1426
关键词
pulsars: individual (PSRs J0631+1036, J0659+1414, J0742-2822, J1420-6048, J1509-5850, J1718-3825)
资金
- Commonwealth of Australia
- Science and Technology Facilities Council of the United Kingdom
- National Aeronautics and Space Administration
- Department of Energy in the United States
- Commissariat a l'Energie Atomique
- Centre National de la Recherche Scientifique/Institut National de Physique Nucleaire et de Physique des Particules in France
- Agenzia Spaziale Italiana
- Istituto Nazionale di Fisica Nucleare in Italy
- Ministry of Education, Culture, Sports, Science and Technology (MEXT)
- High Energy Accelerator Research Organization (KEK)
- Japan Aerospace Exploration Agency (JAXA) in Japan
- K.A. Wallenberg Foundation
- Swedish Research Council
- Swedish National Space Board in Sweden
- Istituto Nazionale di Astrofisica in Italy
- Centre National d'Etudes Spatiales in France
- ICREA Funding Source: Custom
- STFC [ST/G001081/1, ST/G002487/1] Funding Source: UKRI
- Science and Technology Facilities Council [ST/G002487/1, ST/G001081/1] Funding Source: researchfish
- Direct For Mathematical & Physical Scien [0807512] Funding Source: National Science Foundation
- Division Of Astronomical Sciences [0807512] Funding Source: National Science Foundation
We report the detection of pulsed gamma-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 gamma-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. The observed phases of the gamma-ray light curves are, in general, consistent with those predicted by high-altitude models, although we speculate that the gamma-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. This allows us to place some constraints on the viewing geometry and aids the comparison of the gamma-ray light curves with high-energy beam models.
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