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dc.contributor.authorVenter, C.
dc.contributor.authorDe Jager, O.C.
dc.date.accessioned2014-05-05T12:55:31Z
dc.date.available2014-05-05T12:55:31Z
dc.date.issued2008
dc.identifier.citationVenter, C. & De Jager, O.C. 2008. Constraining a general-relativistic frame-dragging model for pulsed radiation from a population of millisecond pulsars in 47 Tucanae using GLAST LAT. Astrophysical journal, 680:L125-L128. [http://iopscience.iop.org/0004-637X/]en_US
dc.identifier.issn0004-637X
dc.identifier.issn1538-4357 (Online)
dc.identifier.urihttp://hdl.handle.net/10394/10482
dc.identifier.urihttp://dx.doi.org/10.1086/589996
dc.identifier.urihttp://iopscience.iop.org/1538-4357/680/2/L125/pdf/589996.pdf
dc.description.abstractAlthough only 22 millisecond pulsars (MSPs) are currently known to exist in the globular cluster (GC) 47 Tucanae, this cluster may harbor 30-60 MSPs, or even up to ∼200. In this Letter, we model the pulsed curvature radiation (CR) gamma-ray flux expected from a population of MSPs in 47 Tucanae. These MSPs produce gamma rays in their magnetospheres via accelerated electron primaries which are moving along curved magnetic field lines. A GC such as 47 Tucanae containing a large number of MSPs provides the opportunity to study a randomized set of pulsar geometries. Geometry-averaged spectra make the testing of the underlying pulsar model more reliable, since in this case the relative flux uncertainty is reduced by 1 order of magnitude relative to the variation expected for individual pulsars (if the number of visible pulsars N = 100). Our predicted spectra violate the EGRET upper limit at 1 GeV, constraining the product of the number of visible pulsars N and the average integral flux above 1 GeV per pulsar. GLAST LAT should place even more stringent constraints on this product, and may also limit the maximum average accelerating potential by probing the CR spectral tail. For N = 22-200, a GLAST LAT nondetection will lead to the constraints that the average integral flux per pulsar should be lower by factors of 0.03-0.003 than current model predictions.en_US
dc.language.isoenen_US
dc.publisherIOP Publicationsen_US
dc.rights© 2008. The American Astronomical Society. All rights reserved.
dc.subjectGamma rays: theoryen_US
dc.subjectglobular clusters: individual (47 Tucanae)en_US
dc.subjectpulsars: generalen_US
dc.subjectradiation mechanisms: non-thermalen_US
dc.titleConstraining a general-relativistic frame-dragging model for pulsed radiation from a population of millisecond pulsars in 47 Tucanae using GLAST LATen_US
dc.typeArticleen_US
dc.contributor.researchID12006653 - Venter, Christo
dc.contributor.researchID10065857 - De Jager, Ocker Cornelis


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