Please use this identifier to cite or link to this item: http://hdl.handle.net/2289/4947
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dc.contributor.authorPaul, Biswajit-
dc.contributor.authorYokogawa, J.-
dc.contributor.authorNishiuchi, M.-
dc.contributor.authorEndo, T.-
dc.contributor.authorDotani, T.-
dc.contributor.authorNagase, F.-
dc.date.accessioned2012-07-17T04:09:03Z-
dc.date.available2012-07-17T04:09:03Z-
dc.date.issued2001-01-
dc.identifier.citationAdvances in Space Research, 2001, Vol. 28, p399-403en
dc.identifier.issn0273-1177-
dc.identifier.urihttp://hdl.handle.net/2289/4947-
dc.descriptionRestricted Accessen
dc.description.abstractThe binary X-ray pulsars which are away from the galactic plane and therefore experience less interstellar absorption, show the presence of a soft component in the spectrum which is often described as a black-body and/or thermal bremsstrahlung emission. A thermal component for the soft excess provides a satisfactory model in the Galactic sources like Her X-1 and 4U 1626-67. But for the pulsars in the Magellanic Clouds for which the distance is of the order of 60 kpc and the luminosity is close to the Eddington limit, a soft component dominating in the lower energy part of the spectrum requires emission region which is a few orders of magnitude larger than the size of a neutron star. Using ASCA observations, we show that a pulsating nature of the soft component in several bright pulsars is difficult to explain if a thermal origin is assumed for the low energy part of the spectrum. We investigate whether a two component power-law with different absorptions or an inversely broken power-law can instead explain the pulsations at low energy. A soft power-law component may also be a common feature of the binary X-ray pulsars, which is difficult to observe because most of the sources are in the galactic plane and experience large interstellar absorption.en
dc.language.isoenen
dc.publisherElsevier B.V.en
dc.relation.urihttp://adsabs.harvard.edu/abs/2001AdSpR..28..399Pen
dc.relation.urihttp://dx.doi.org/10.1016/S0273-1177(01)00438-0en
dc.rights2001 Elsevier B.V.en
dc.titleDetection of pulsating soft X-ray excess in the Magellanic Cloud pulsars with ASCAen
dc.typeArticleen
Appears in Collections:Research Papers (A&A)

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