A1 Refereed original research article in a scientific journal
Cyclotron emission, absorption, and the two faces of X-ray pulsar A 0535+262
Authors: Tsygankov SS, Doroshenko V, Mushtukov AA, Suleimanov VF, Lutovinov AA, Poutanen J
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: 487
Issue: 1
First page : L30
Last page: L34
Number of pages: 5
ISSN: 0035-8711
DOI: https://doi.org/10.1093/mnrasl/slz079
Self-archived copy’s web address: https://research.utu.fi/converis/portal/detail/Publication/42543801
Deep NuSTAR observation of X-ray pulsar A 0535+262, performed at a very low luminosity of similar to 7 x 10(34) erg s(-1), revealed the presence of two spectral components. We argue that the high-energy component is associated with cyclotron emission from recombination of electrons collisionally excited to the upper Landau levels. The cyclotron line energy of E-cyc = 47.7 +/- 0.8 keV was measured at the luminosity of almost an order of magnitude lower than what was achieved before. The data firmly exclude a positive correlation of the cyclotron energy with the mass accretion rate in this source.
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