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NuSTAR observations of wind-fed X-ray pulsar GX301-2 during unusual spin-up event
Univ Turku, Dept Phys & Astron, Turku 20014, Finland..
Univ Turku, Dept Phys & Astron, Turku 20014, Finland..
Univ Turku, Dept Phys & Astron, Turku 20014, Finland.;Russian Acad Sci, Space Res Inst, Profsoyuznaya Str 84-32, Moscow 117997, Russia..
Russian Acad Sci, Space Res Inst, Profsoyuznaya Str 84-32, Moscow 117997, Russia.;Univ Tubingen, Inst Astron & Astrophys, Sand 1, D-72076 Tubingen, Germany..
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2019 (English)In: Astronomy and Astrophysics, ISSN 0004-6361, E-ISSN 1432-0746, Vol. 629, article id A101Article in journal (Refereed) Published
Abstract [en]

We report on NuSTAR observations of the well-known wind-accreting X-ray pulsar GX301-2 during a strong spin-up episode that took place in January-March 2019. A measurement of high luminosity of the source in the most recent observation allowed us to detect a positive correlation of the cyclotron line energy with luminosity. Beyond that, only minor differences in spectral and temporal properties of the source during the spin-up, presumably associated with the formation of a transient accretion disk, and the normal wind-fed state could be detected. Finally, we discuss conditions for the formation of the disk and possible reasons for lack of any appreciable variations in most of the observed source properties induced by the change of the accretion mechanism, and conclude that the bulk of the observed X-ray emission is still likely powered by direct accretion from the wind.

Place, publisher, year, edition, pages
EDP SCIENCES S A , 2019. Vol. 629, article id A101
Keywords [en]
accretion, accretion disks, magnetic fields, pulsars: individual: GX301-2, stars: neutron, X-rays: binaries
National Category
Astronomy, Astrophysics and Cosmology
Identifiers
URN: urn:nbn:se:kth:diva-261009DOI: 10.1051/0004-6361/201936045ISI: 000485214900005OAI: oai:DiVA.org:kth-261009DiVA, id: diva2:1357187
Note

QC 20191003

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

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Poutanen, Juri

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