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Observations of GRO J1744-28 in quiescence with XMM-Newton

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dc.contributor.author Doroshenko V.
dc.contributor.author Suleimanov V.
dc.contributor.author Tsygankov S.
dc.contributor.author Mönkkönen J.
dc.contributor.author Ji L.
dc.contributor.author Santangelo A.
dc.date.accessioned 2021-02-24T20:31:46Z
dc.date.available 2021-02-24T20:31:46Z
dc.date.issued 2020
dc.identifier.issn 0004-6361
dc.identifier.uri https://dspace.kpfu.ru/xmlui/handle/net/160723
dc.description.abstract © ESO 2020. We report on the deep observations of the "bursting pulsar"GRO J1744-28, which were performed with XMM-Newton and aimed to clarify the origin of its X-ray emission in quiescence. We detect the source at a luminosity level of ∼1034 erg s-1 with an X-ray spectrum that is consistent with the power law, blackbody, or accretion-heated neutron star atmosphere models. The improved X-ray localization of the source allowed us to confirm the previously identified candidate optical counterpart as a relatively massive G/K III star at 8 kpc close to the Galactic center, implying an almost face-on view of the binary system. Although we could only find a nonrestricting upper limit on the pulsed fraction of ∼20%, the observed hard X-ray spectrum and strong long-term variability of the X-ray flux suggest that the source is also still accreting when not in outburst. The luminosity corresponding to the onset of centrifugal inhibition of accretion is thus estimated to be at least two orders of magnitude lower than previously reported. We discuss this finding in the context of previous studies and argue that the results indicate a multipole structure in the magnetic field with the first dipole term of ∼1010 G, which is much lower than previously assumed.
dc.relation.ispartofseries Astronomy and Astrophysics
dc.subject Accretion
dc.subject Accretion disks
dc.subject Magnetic fields
dc.subject Pulsars: general
dc.subject Scattering
dc.subject X-rays: binaries
dc.title Observations of GRO J1744-28 in quiescence with XMM-Newton
dc.type Article
dc.relation.ispartofseries-volume 643
dc.collection Публикации сотрудников КФУ
dc.source.id SCOPUS00046361-2020-643-SID85095968569

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  • Публикации сотрудников КФУ Scopus [22633]
    Коллекция содержит публикации сотрудников Казанского федерального (до 2010 года Казанского государственного) университета, проиндексированные в БД Scopus, начиная с 1970г.

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