1. RRI Digital Repository
  2. 04. Astronomy and Astrophysics
  3. Research Papers (A&A)
Please use this identifier to cite or link to this item: http://hdl.handle.net/2289/7201
Full metadata record
DC FieldValueLanguage
dc.contributor.authorPradhan, Pragati-
dc.contributor.authorRaman, Gayathri-
dc.contributor.authorPaul, Biswajit-
dc.date.accessioned2019-05-03T18:25:22Z-
dc.date.available2019-05-03T18:25:22Z-
dc.date.issued2019-03-
dc.identifier.citationMonthly Notices of the Royal Astronomical Society, 2019, Vol.483, p 5687–5693en_US
dc.identifier.issn0035-8711-
dc.identifier.issn1365-2966 - (online)-
dc.identifier.urihttp://hdl.handle.net/2289/7201-
dc.descriptionOpen Access.en_US
dc.description.abstractWe present a high-resolution X-ray spectrum of the accreting X-ray pulsar OAO 1657 – 415 obtained with HETG + ACIS-S onboard Chandra, revealing the presence of a broad line component around ∼6.3 keV associated with the neutral iron Kα line at 6.4 keV. This is interpreted as a Compton shoulder arising from the Compton-scattering of the 6.4-keV fluorescence photons, making OAO 1657–415 the second accreting neutron star in which such a feature has been detected. A Compton shoulder reveals the presence of dense matter surrounding the X-ray source. We did not detect any periodicity in the light-curve and we obtained an upper limit of ∼2 per cent for the pulse fraction during this observation. This could be a result of the smearing of the pulses when X-ray photons are scattered from a large region around the neutron star. In addition to the Fe Kα, Fe Kβ and Ni Kα lines already reported for this source, we report for the first time the presence of He-like and H-like iron emission lines at 6.7 and 6.97 keV in the first-order HETG spectrum. The detection of such ionized lines, indicative of a highly ionized surrounding medium, is rare in X-ray binaries.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.483.5687P/abstracten_US
dc.relation.urihttps://arxiv.org/abs/1812.06108en_US
dc.relation.urihttps://doi.org/10.1093/mnras/sty3441en_US
dc.rights2019 The Author(s)en_US
dc.subjectstars: pulsars: generalen_US
dc.subjectX-rays: binariesen_US
dc.subjectX-rays: individual: OAO 1657 – 415en_US
dc.titleMultitude of iron lines including a Compton-scattered component in OAO 1657 – 415 detected with Chandraen_US
dc.typeArticleen_US
Appears in Collections:Research Papers (A&A)

Files in This Item:
File Description SizeFormat 
2019_MNRAS_Vol.483_p5687-5693.pdfOpen Access381.4 kBAdobe PDFView/Open
Show simple item record


Items in RRI Digital Repository are protected by copyright, with all rights reserved, unless otherwise indicated.