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Please use this identifier to cite or link to this item: http://hdl.handle.net/2289/7169
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dc.contributor.authorRoy, Jayashree-
dc.contributor.authorAgrawal, P.C.-
dc.contributor.authorPaul, Biswajit-
dc.contributor.author+13 Co-Authors-
dc.date.accessioned2019-02-28T19:32:03Z-
dc.date.available2019-02-28T19:32:03Z-
dc.date.issued2019-02-10-
dc.identifier.citationAstrophysical Journal, 2019, Vol. 872, p33en_US
dc.identifier.issn0004-637X-
dc.identifier.urihttp://hdl.handle.net/2289/7169-
dc.descriptionOpen Accessen_US
dc.description.abstractThe Be/X-ray binary 4U 0115+63 was observed by the Large Area X-ray Proportional Counter (LAXPC) instrument on AstroSat on 2015 October 24 during the peak of a giant Type II outburst. Prominent intensity oscillations at ~1 and ~2 MHz frequency were detected during the outburst. Nuclear Spectroscopic Telescope Array (Nu Star) observations made during the same outburst also show millihertz quasi-periodic oscillations (QPOs). Details of the oscillations and their characteristics deduced from LAXPC/AstroSat and Nu Star observations are reported in this paper. Analysis of the archival Rossi X-ray Timing Explorer/Proportional Counter Array data during 2001–2011 also show the presence of millihertz QPOs during some of the outbursts, and details of these QPOs are also reported. Possible models to explain the origin of the millihertz oscillations are examined. Similar QPOs, albeit at higher frequencies, have been reported from other neutron star and black hole sources, and both may have a common origin. Current models to explain the instability in the inner accretion disk causing the intense oscillations are discussed.en_US
dc.language.isoenen_US
dc.publisherIOP Sciences for The American Astronomical Societyen_US
dc.relation.urihttps://ui.adsabs.harvard.edu//#abs/2019ApJ...872...33R/abstracten_US
dc.relation.urihttps://arxiv.org/abs/1901.09382en_US
dc.relation.urihttps://doi.org/10.3847/1538-4357/aafaf1en_US
dc.rights2019, The American Astronomical Societyen_US
dc.subjectpulsarsen_US
dc.subjectindividual (4U 0115+63) – starsen_US
dc.subjectemission-lineen_US
dc.subjectBe – X-raysen_US
dc.subjectbinariesen_US
dc.titleLAXPC/AstroSat Study of ~1 and ~2 mHz Quasi-periodic Oscillations in the Be/X-Ray Binary 4U 0115+63 during Its 2015 Outbursten_US
dc.typeArticleen_US
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