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On the magnetic field of the first Galactic ultraluminous X-ray pulsar Swift J0243.6+6124
Univ Turku, Dept Phys & Astron, Tuorla Observ, FI-20014 Turku, Finland.;Russian Acad Sci, Space Res Inst, Profsoyuznaya Str 84-32, Moscow 117997, Russia..
Univ Tubingen, Inst Astron & Astrophys, Sand 1, D-72076 Tubingen, Germany..
Russian Acad Sci, Space Res Inst, Profsoyuznaya Str 84-32, Moscow 117997, Russia.;Univ Amsterdam, Anton Pannekoek Inst Astron, Sci Pk 904, NL-1098 XH Amsterdam, Netherlands..
Russian Acad Sci, Space Res Inst, Profsoyuznaya Str 84-32, Moscow 117997, Russia..
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2018 (English)In: Monthly notices of the Royal Astronomical Society, ISSN 0035-8711, E-ISSN 1365-2966, Vol. 479, no 1, p. L134-L138Article in journal (Refereed) Published
Abstract [en]

We report on the monitoring of the final stage of the outburst from the first Galactic ultraluminous X-ray pulsar Swift J0243.6+6124, which reached similar to 40 Eddington luminosities. The main aim of the monitoring program with the Swift/XRT telescope was to measure the magnetic field of the neutron star using the luminosity of transition to the 'propeller' state. The visibility constraints, unfortunately, did not permit us to observe the source down to the fluxes low enough to detect such a transition. The tight upper limit on the propeller luminosity L-prop < 6.8x10(35) erg s(-1) implies the dipole component of the magnetic field B< 10(13) G. On the other hand, the observed evolution of the pulse profile and of the pulsed fraction with flux points to a change of the emission region geometry at the critical luminosity L-crit similar to 3 x 10(38) erg s(-1) both in the rising and declining parts of the outburst. We associate the observed change with the onset of the accretion column, which allows us to get an independent estimate of the magnetic field strength close to the neutron stars surface of B > 10(13) G. Given the existing uncertainty in the effective magnetosphere size, we conclude that both estimates are marginally compatible with each other.

Place, publisher, year, edition, pages
Oxford University Press, 2018. Vol. 479, no 1, p. L134-L138
Keywords [en]
accretion, accretion discs, stars: magnetic field, stars: neutron, X-rays: binaries, pulsars: general, pulsars: individual: Swift J0243.6+6124
National Category
Physical Sciences
Identifiers
URN: urn:nbn:se:kth:diva-237127DOI: 10.1093/mnrasl/sly116ISI: 000446987300026Scopus ID: 2-s2.0-85054711735OAI: oai:DiVA.org:kth-237127DiVA, id: diva2:1259221
Note

QC 20181029

Available from: 2018-10-29 Created: 2018-10-29 Last updated: 2019-03-18Bibliographically approved

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Poutanen, Juri
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