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Millihertz quasi-periodic oscillations and broad iron line from LMC X-1

Alam, Shah Md; Dewangan, Gulab C; Belloni, T; Mukherjee, Dipanjan; Jhingan, Sanjay

Description

We study the temporal and energy spectral characteristics of the persistent black hole Xray binary LMC X-1 using two XMM–Newton and a Suzaku observation. We report the discovery of low-frequency (∼26–29 m Hz) quasi-periodic oscillations (QPOs). We also report the variability of the broad iron Kα line studied earlier with Suzaku. The QPOs are found to be weak with fractional rms amplitude in the ∼1–2 per cent range and quality factor Q ∼ 2–10. They are accompanied by weak red noise or...[Show more]

dc.contributor.authorAlam, Shah Md
dc.contributor.authorDewangan, Gulab C
dc.contributor.authorBelloni, T
dc.contributor.authorMukherjee, Dipanjan
dc.contributor.authorJhingan, Sanjay
dc.date.accessioned2018-11-29T22:53:55Z
dc.date.available2018-11-29T22:53:55Z
dc.identifier.issn0035-8711
dc.identifier.urihttp://hdl.handle.net/1885/152615
dc.description.abstractWe study the temporal and energy spectral characteristics of the persistent black hole Xray binary LMC X-1 using two XMM–Newton and a Suzaku observation. We report the discovery of low-frequency (∼26–29 m Hz) quasi-periodic oscillations (QPOs). We also report the variability of the broad iron Kα line studied earlier with Suzaku. The QPOs are found to be weak with fractional rms amplitude in the ∼1–2 per cent range and quality factor Q ∼ 2–10. They are accompanied by weak red noise or zero-centred Lorentzian components with rms variability at the ∼1–3 per cent level. The energy spectra consist of three varying components – multicolour disc blackbody (kTin ∼ 0.7–0.9 keV), high-energy power-law tail ( ∼ 2.4–3.3) and a broad iron line at 6.4–6.9 keV. The broad iron line, the QPO and the strong power-law component are not always present. The QPOs and the broad iron line appear to be clearly detected in the presence of a strong power-law component. The broad iron line is found to be weaker when the disc is likely truncated and absent when the power-law component almost vanished. These results suggest that the QPO and the broad iron line together can be used to probe the dynamics of the accretion disc and the corona. Key words: accretion, accretion discs – black hole physics – binaries: spectroscopic – stars:
dc.format.mimetypeapplication/pdf
dc.publisherBlackwell Publishing Ltd
dc.sourceMonthly Notices of the Royal Astronomical Society
dc.subjectKeywords: accretion, accretion discs; Binaries: spectroscopic; Black hole physics; Stars: individual: LMC X-1; X-rays: stars
dc.titleMillihertz quasi-periodic oscillations and broad iron line from LMC X-1
dc.typeJournal article
local.description.notesImported from ARIES
local.identifier.citationvolume445
dc.date.issued2014
local.identifier.absfor020100 - ASTRONOMICAL AND SPACE SCIENCES
local.identifier.ariespublicationu5058514xPUB38
local.type.statusPublished Version
local.contributor.affiliationAlam, Shah Md, Centre of Theoretical Physics
local.contributor.affiliationDewangan, Gulab C, IUCAA, Ganeshkhind, Pune
local.contributor.affiliationBelloni, T, INAF – Osservatorio Astronomico di Brera
local.contributor.affiliationMukherjee, Dipanjan, College of Science, ANU
local.contributor.affiliationJhingan, Sanjay, Centre of Theoretical Physics
local.bibliographicCitation.issue4
local.bibliographicCitation.startpage4259
local.bibliographicCitation.lastpage4266
local.identifier.doi10.1093/mnras/stu2048
local.identifier.absseo970102 - Expanding Knowledge in the Physical Sciences
dc.date.updated2018-11-29T07:56:12Z
local.identifier.scopusID2-s2.0-84923012093
local.identifier.thomsonID000346963300074
dcterms.accessRightsOpen Access
CollectionsANU Research Publications

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