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Article: On the origin of X-ray emission from millisecond pulsars in 47 Tucanae

TitleOn the origin of X-ray emission from millisecond pulsars in 47 Tucanae
Authors
KeywordsGlobular clusters: individual (47 Tucanae)
Pulsars: general
Radiation mechanisms: nonthermal
Radiation mechanisms: thermal
X-rays: stars
Issue Date2003
PublisherInstitute of Physics Publishing Ltd. The Journal's web site is located at http://iopscience.iop.org/2041-8205
Citation
Astrophysical Journal Letters, 2003, v. 598 n. 2 I, p. 1207-1216 How to Cite?
AbstractThe observed spectra and X-ray luminosities of millisecond pulsars in 47 Tuc can be interpreted in the context of theoretical models based on strong, small-scale, multipole fields on the neutron star surface. For multipole fields that are relatively strong compared to the large-scale dipole field, the emitted X-rays are thermal and likely result from polar cap heating associated with the return current from the polar gap. On the other hand, for weak multipole fields, the emission is nonthermal and results from synchrotron radiation of e ± pairs created by curvature radiation. The X-ray luminosity L X is related to the spin-down power L sd, expressed in the form L X ∝ L sd β with β ∼ 0.5 and ∼1 for strong and weak multipole fields, respectively. If the polar cap size is of the order of the length scale of the multipole field s, the polar cap temperature is ∼3 × 10 6 K(L sd/10 34 ergs s -1) 1/8(s/3 × 10 4 cm) -1/2. A comparison of the X-ray properties of millisecond pulsars in globular clusters and in the Galactic field suggests that the emergence of relatively strong small-scale multipole fields from the neutron star interior may be correlated with the age and evolutionary history of the underlying neutron star.
Persistent Identifierhttp://hdl.handle.net/10722/43406
ISSN
2015 Impact Factor: 5.487
2015 SCImago Journal Rankings: 3.369
ISI Accession Number ID
References

 

DC FieldValueLanguage
dc.contributor.authorCheng, KSen_HK
dc.contributor.authorTaam, REen_HK
dc.date.accessioned2007-03-23T04:45:06Z-
dc.date.available2007-03-23T04:45:06Z-
dc.date.issued2003en_HK
dc.identifier.citationAstrophysical Journal Letters, 2003, v. 598 n. 2 I, p. 1207-1216en_HK
dc.identifier.issn2041-8205en_HK
dc.identifier.urihttp://hdl.handle.net/10722/43406-
dc.description.abstractThe observed spectra and X-ray luminosities of millisecond pulsars in 47 Tuc can be interpreted in the context of theoretical models based on strong, small-scale, multipole fields on the neutron star surface. For multipole fields that are relatively strong compared to the large-scale dipole field, the emitted X-rays are thermal and likely result from polar cap heating associated with the return current from the polar gap. On the other hand, for weak multipole fields, the emission is nonthermal and results from synchrotron radiation of e ± pairs created by curvature radiation. The X-ray luminosity L X is related to the spin-down power L sd, expressed in the form L X ∝ L sd β with β ∼ 0.5 and ∼1 for strong and weak multipole fields, respectively. If the polar cap size is of the order of the length scale of the multipole field s, the polar cap temperature is ∼3 × 10 6 K(L sd/10 34 ergs s -1) 1/8(s/3 × 10 4 cm) -1/2. A comparison of the X-ray properties of millisecond pulsars in globular clusters and in the Galactic field suggests that the emergence of relatively strong small-scale multipole fields from the neutron star interior may be correlated with the age and evolutionary history of the underlying neutron star.en_HK
dc.format.extent194657 bytes-
dc.format.extent12158 bytes-
dc.format.mimetypeapplication/pdf-
dc.format.mimetypetext/plain-
dc.languageengen_HK
dc.publisherInstitute of Physics Publishing Ltd. The Journal's web site is located at http://iopscience.iop.org/2041-8205en_HK
dc.relation.ispartofAstrophysical Journal Lettersen_HK
dc.rightsThe Astrophysical Journal. Copyright © University of Chicago Press.en_HK
dc.rightsCreative Commons: Attribution 3.0 Hong Kong License-
dc.subjectGlobular clusters: individual (47 Tucanae)en_HK
dc.subjectPulsars: generalen_HK
dc.subjectRadiation mechanisms: nonthermalen_HK
dc.subjectRadiation mechanisms: thermalen_HK
dc.subjectX-rays: starsen_HK
dc.titleOn the origin of X-ray emission from millisecond pulsars in 47 Tucanaeen_HK
dc.typeArticleen_HK
dc.identifier.openurlhttp://library.hku.hk:4550/resserv?sid=HKU:IR&issn=0004-637X&volume=598&issue=2 pt 2&spage=1207&epage=1216&date=2003&atitle=On+the+Origin+of+X-Ray+Emission+from+Millisecond+Pulsars+in+47+Tucanaeen_HK
dc.identifier.emailCheng, KS: hrspksc@hkucc.hku.hken_HK
dc.identifier.authorityCheng, KS=rp00675en_HK
dc.description.naturepublished_or_final_versionen_HK
dc.identifier.doi10.1086/379009en_HK
dc.identifier.scopuseid_2-s2.0-0346969607en_HK
dc.identifier.hkuros85371-
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-0346969607&selection=ref&src=s&origin=recordpageen_HK
dc.identifier.volume598en_HK
dc.identifier.issue2 Ien_HK
dc.identifier.spage1207en_HK
dc.identifier.epage1216en_HK
dc.identifier.isiWOS:000187149300040-
dc.publisher.placeUnited Kingdomen_HK
dc.identifier.scopusauthoridCheng, KS=9745798500en_HK
dc.identifier.scopusauthoridTaam, RE=7003756329en_HK

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