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27 April 2024

» arxiv » 1905.9496

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Cyclotron emission, absorption, and the two faces of X-ray pulsar A 0535+262
Sergey S. Tsygankov ; Victor Doroshenko ; Alexander A. Mushtukov ; Valery F. Suleimanov ; Alexander A. Lutovinov ; Juri Poutanen ;
Date:	23 May 2019
Abstract:	Deep NuSTAR observation of X-ray pulsar A 0535+262, performed at a very low luminosity of $sim7 imes10^{34}$ 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 $E_{ m cyc}=47.7pm0.8$ 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.
Source:	arXiv, 1905.9496
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