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Observational constraints on the magnetic field of the bright transient Be/X-ray pulsar SXP 4.78
Tekijät: Andrey N Semena, Alexander A Lutovinov, Ilya A Mereminskiy, Sergey S Tsygankov, Andrey E Shtykovsky, Sergey V Molkov, Juri Poutanen
Kustantaja: OXFORD UNIV PRESS
Julkaisuvuosi: 2019
Journal: Monthly Notices of the Royal Astronomical Society
Tietokannassa oleva lehden nimi: MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
Lehden akronyymi: MON NOT R ASTRON SOC
Vuosikerta: 490
Numero: 3
Aloitussivu: 3355
Lopetussivu: 3364
Sivujen määrä: 10
ISSN: 0035-8711
eISSN: 1365-2966
DOI: https://doi.org/10.1093/mnras/stz2722
Rinnakkaistallenteen osoite: 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.)
Ladattava julkaisu This is an electronic reprint of the original article. |  |
