A1 Refereed original research article in a scientific journal

Cyclotron emission, absorption, and the two faces of X-ray pulsar A 0535+262




AuthorsTsygankov SS, Doroshenko V, Mushtukov AA, Suleimanov VF, Lutovinov AA, Poutanen J

PublisherOXFORD UNIV PRESS

Publication year2019

JournalMonthly Notices of the Royal Astronomical Society

Journal name in sourceMONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY

Journal acronymMON NOT R ASTRON SOC

Volume487

Issue1

First page L30

Last pageL34

Number of pages5

ISSN0035-8711

DOIhttps://doi.org/10.1093/mnrasl/slz079

Self-archived copy’s web addresshttps://research.utu.fi/converis/portal/detail/Publication/42543801


Abstract
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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Last updated on 2024-26-11 at 15:08