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dc.contributor.authorGolden, A.
dc.contributor.authorButler, R. F.
dc.contributor.authorShearer, A.
dc.date.accessioned2018-08-24T08:24:57Z
dc.date.available2018-08-24T08:24:57Z
dc.date.issued2001-05-01
dc.identifier.citationGolden, A. Butler, R. F.; Shearer, A. (2001). A search for the optical counterpart to psr b1821-24 in m 28. Astronomy & Astrophysics 371 (1), 198-204
dc.identifier.issn0004-6361,1432-0746
dc.identifier.urihttp://hdl.handle.net/10379/9224
dc.description.abstractWe have analysed archival HST/WFPC2 images in both the F555W & F814W bands of the core field of the globular cluster M 28 in an attempt to identify the optical counterpart of the magnetospherically active millisecond pulsar PSR B1821-24. Examination of the radio derived error circle yielded several potential candidates, down to a magnitude of V similar to 24.5 (V(0) similar to 23.0). Each were further investigated, both in the context of the CMD of M 28, and also with regard to phenomenological models of pulsar magnetospheric emission. The latter was based on both luminosity-spindown correlations and known spectral flux density behaviour in this regime from the small population of optical pulsars observed to date. None of the potential candidates exhibited emission expected from a magnetospherically active pulsar. The fact that the magnetic field & spin coupling for PSR B1821-24 is of a similar magnitude to that of the Crab pulsar in the vicinity of the light cylinder has suggested that the millisecond pulsar may well be an efficient nonthermal emitter. ASCA's detection of a strong synchrotron-dominated X-ray pulse fraction encourages such a viewpoint. We argue that only future dedicated 2-d high speed photometry observations of the radio error-circle can finally resolve this matter.
dc.publisherEDP Sciences
dc.relation.ispartofAstronomy & Astrophysics
dc.subjectpulsars : general
dc.subjectpulsars : individual psr b1821-24 globular clusters : general
dc.subjectglobular clusters : individual m 28/ngc 6626
dc.subjecttechniques : image processing astrometry
dc.subjectx-ray luminosity
dc.subjectglobular-clusters
dc.subjectcrab pulsar
dc.subjectimage-reconstruction
dc.subjectneutron-stars
dc.subjectradiation
dc.subjectwfpc2
dc.subjectphotometry
dc.subjectemission
dc.subjectm28
dc.titleA search for the optical counterpart to psr b1821-24 in m 28
dc.typeArticle
dc.identifier.doi10.1051/0004-6361:20010340
dc.local.publishedsourcehttps://www.aanda.org/articles/aa/pdf/2001/19/aa10285.pdf
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