A1 Refereed original research article in a scientific journal
Discovery of a Pulse-phase-transient Cyclotron Line in the X-Ray pulsar GRO J2058+42
Authors: Molkov S, Lutovinov A, Tsygankov S, Mereminskiy I, Mushtukov A
Publisher: IOP PUBLISHING LTD
Publication year: 2019
Journal: Astrophysical Journal Letters
Journal name in source: ASTROPHYSICAL JOURNAL LETTERS
Journal acronym: ASTROPHYS J LETT
Article number: L11
Volume: 883
Issue: 1
Number of pages: 6
ISSN: 2041-8205
eISSN: 2041-8213
DOI: https://doi.org/10.3847/2041-8213/ab3e4d
Self-archived copy’s web address: https://research.utu.fi/converis/portal/detail/Publication/42651509
We report the discovery of absorption features in the X-ray spectrum of the transient X-ray pulsar GRO J2058+42. The features are detected around similar to ~10, similar to ~20, and similar to ~30 keV in both NuSTAR observations carried out during the source type II outburst in spring 2019. The most intriguing property is that the deficit of photons around these energies is registered only in the narrow phase interval covering around 10% of the pulsar spin period. We interpret these absorption lines as a cyclotron resonant scattering line (fundamental) and two higher harmonics. The measured energy allow us to estimate the magnetic field strength of the neutron star as similar to ~10(12) G.
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