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Please use this identifier to cite or link to this item: http://hdl.handle.net/2289/7227
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dc.contributor.authorMaitra, Chandreyee-
dc.contributor.authorPradhan, Pragati-
dc.contributor.authorPaul, Biswajit-
dc.contributor.authorRaichur, Harsha-
dc.contributor.authorVarun-
dc.date.accessioned2019-07-01T15:10:08Z-
dc.date.available2019-07-01T15:10:08Z-
dc.date.issued2019-03-1-
dc.identifier.citationMonthly Notices of the Royal Astronomical Society, 2019, Vol. 484, p L1–L6en_US
dc.identifier.issn0035-8711-
dc.identifier.issn1365-2966 - (online)-
dc.identifier.urihttp://hdl.handle.net/2289/7227-
dc.descriptionOpen Access.en_US
dc.description.abstractWe report the first report on cyclotron line studies with the LAXPC instrument onboard AstroSat of the high-mass X-ray binary pulsar 4U 1538–52. During the observation of source that spanned about 1 d with a net exposure of 50 ks, the source X-ray flux remained constant. Pulse profile is double peaked in low-energy range and has a single peak in high-energy range, the transition taking place around the cyclotron line energy of the source. Cyclotron scattering feature (CRSF) is detected at ∼22 keV with a very high significance in phase-averaged spectrum. It is one of the highest signal to noise ratio detections of CRSF for this source. We performed detailed pulse-phase-resolved spectral analysis with 10 independent phase bins. We report the results of pulse-phase-resolved spectroscopy of the continuum and CRSF parameters. The cyclotron line parameters show pulse phase dependence over the entire phase with a CRSF energy variation of ∼13 per cent⁠, which is in agreement with previous studies. We also confirm the increase in the centroid energy of the CRSF observed between the 1996–2004 (RXTE) and the 2012 (Suzaku) observations, reinforcing that the increase was a long-term change.en_US
dc.language.isoenen_US
dc.publisherOxford University Press on behalf of the Royal Astronomical Societyen_US
dc.relation.urihttps://ui.adsabs.harvard.edu/abs/2019MNRAS.484L...1M/abstracten_US
dc.relation.urihttps://arxiv.org/abs/1812.06609en_US
dc.relation.urihttps://doi.org/10.1093/mnrasl/sly234en_US
dc.rights2019 The Author(s)en_US
dc.subjectbinariesen_US
dc.subjectgeneral – radiation mechanismen_US
dc.subjectnon-thermal – (stars:) pulsarsen_US
dc.subjectgeneral – (stars:) pulsarsen_US
dc.subjectindividualen_US
dc.subject4U 1538-522 –X-raysen_US
dc.subjectstarsen_US
dc.titleProbing the Cyclotron line characteristics of 4U 1538–522 using AstroSat-LAXPCen_US
dc.typeArticleen_US
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