A1 Refereed original research article in a scientific journal
Observational constraints on the magnetic field of the bright transient Be/X-ray pulsar SXP 4.78
Authors: Andrey N Semena, Alexander A Lutovinov, Ilya A Mereminskiy, Sergey S Tsygankov, Andrey E Shtykovsky, Sergey V Molkov, Juri Poutanen
Publisher: OXFORD UNIV PRESS
Publication year: 2019
Journal: Monthly Notices of the Royal Astronomical Society
Journal name in source: MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
Journal acronym: MON NOT R ASTRON SOC
Volume: 490
Issue: 3
First page : 3355
Last page: 3364
Number of pages: 10
ISSN: 0035-8711
eISSN: 1365-2966
DOI: https://doi.org/10.1093/mnras/stz2722
Self-archived copy’s web address: https://research.utu.fi/converis/portal/detail/Publication/44996196
We report results of the spectral and timing analysis of the Be/X-ray pulsar SXP 4.78 using the data obtained during its recent outburst with NuSTAR, Swift, Chandra, and NICER observatories. Using an overall evolution of the system luminosity, spectral analysis, and variability power spectrum we obtain constraints on the neutron star magnetic field strength. We found a rapid evolution of the variability power spectrum during the rise of the outburst, and absence of the significant changes during the flux decay. Several low frequency quasiperiodic oscillation features are found to emerge on the different stages of the outburst, but no clear clues on their origin were found in the energy spectrum and overall flux behaviour. We use several indirect methods to estimate the magnetic field strength on the neutron star surface and found that most of them suggest magnetic field B less than or similar to 2 x 10(12) G. The strictest upper limit comes from the absence of the cyclotron absorption features in the energy spectra and suggests relatively weak magnetic field B < 6 x 10(11) G.)
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