PROPELLER EFFECT in the TRANSIENT X-RAY PULSAR SMC X-2
2017 (English)In: Astrophysical Journal, ISSN 0004-637X, E-ISSN 1538-4357, Vol. 834, no 2, 209Article in journal (Refereed) Published
We report the results of the monitoring campaign of the transient X-ray pulsar SMC X-2 performed with the Swift/XRT telescope over the period of 2015 September-2016 January during the Type II outburst. During this event, the bolometric luminosity of the source ranged from ≃1039 down to several ×1034 erg s-1. Moreover, we discovered its dramatic drop by a factor of more than 100 below the limiting value of erg s-1, which can be interpreted as a transition to the propeller regime. These measurements make SMC X-2 the sixth pulsating X-ray source where such a transition is observed and allow us to estimate the magnetic field of the neutron star in the system B ≃ 3 × 1012 G, which is in agreement with independent results of the spectral analysis.
Place, publisher, year, edition, pages
Institute of Physics (IOP), 2017. Vol. 834, no 2, 209
accretion, accretion disks, magnetic fields, stars: individual (SMC X-2), X-rays: binaries
IdentifiersURN: urn:nbn:se:kth:diva-202224DOI: 10.3847/1538-4357/834/2/209ScopusID: 2-s2.0-85010028374OAI: oai:DiVA.org:kth-202224DiVA: diva2:1082924
Funding text: A.A.L., S.S.T., and S.V.M. acknowledge support from the Russian Science Foundation (grant 14-12-01287). J.P. thanks the Foundations Professor Pool, the Finnish Cultural Foundation, and the Academy of Finland (grant 268740) for their financial support. The authors thank the anonymous referee for their useful comments. QC 201703202017-03-202017-03-202017-03-20Bibliographically approved