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An observational argument against accretion in magnetars

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dc.contributor.author Doroshenko V.
dc.contributor.author Santangelo A.
dc.contributor.author Suleimanov V.F.
dc.contributor.author Tsygankov S.S.
dc.date.accessioned 2021-02-24T20:31:47Z
dc.date.available 2021-02-24T20:31:47Z
dc.date.issued 2020
dc.identifier.issn 0004-6361
dc.identifier.uri https://dspace.kpfu.ru/xmlui/handle/net/160724
dc.description.abstract © ESO 2020. The phenomenology of anomalous X-ray pulsars is usually interpreted within the paradigm of very highly magnetized neutron stars, also known as magnetars. According to this paradigm, the persistent emission of anomalous X-ray pulsars (AXPs) is powered by the decay of the magnetic field. However, an alternative scenario in which the persistent emission is explained through accretion is also discussed in literature. In particular, AXP 4U 0142+61 has been suggested to be either an accreting neutron star or a white dwarf. Here, we rule out this scenario based on the observed X-ray variability properties of the source. We directly compare the observed power spectra of 4U 0142+61 and of two other magnetars, 1RXS J170849.0-400910 and 1E 1841-045 with that of the X-ray pulsar 1A 0535+262, and of the intermediate polar GK Persei. In addition, we include a bright young radio pulsar PSR B1509-58 for comparison. We show that, unlike accreting sources, no aperiodic variability within the expected frequency range is observed in the power density spectrum of the magnetars and the radio pulsar. Considering that strong variability is an established feature of all accreting systems from young stellar objects to super-massive black holes and the absence of the variability reports from other magnetars, we conclude that our results also indicate that magnetars, in general, are not powered by accretion.
dc.relation.ispartofseries Astronomy and Astrophysics
dc.subject Binaries: general
dc.subject Pulsars: general
dc.subject Stars: magnetars
dc.title An observational argument against accretion in magnetars
dc.type Review
dc.relation.ispartofseries-volume 643
dc.collection Публикации сотрудников КФУ
dc.source.id SCOPUS00046361-2020-643-SID85096756269

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  • Публикации сотрудников КФУ Scopus [24551]
    Коллекция содержит публикации сотрудников Казанского федерального (до 2010 года Казанского государственного) университета, проиндексированные в БД Scopus, начиная с 1970г.

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