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

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arxiv 1905.09496 v1 pith:TAUJR3ZE submitted 2019-05-23 astro-ph.HE

Sergey S. Tsygankov , Victor Doroshenko , Alexander A. Mushtukov , Valery F. Suleimanov , Alexander A. Lutovinov , Juri Poutanen This is my paper · ORCID
classification astro-ph.HE
keywords cyclotronemissionenergyluminositypulsarx-rayabsorptionaccretion
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abstract

Deep NuSTAR observation of X-ray pulsar A 0535+262, performed at a very low luminosity of $\sim7\times10^{34}$ 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 $E_{\rm cyc}=47.7\pm0.8$ 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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Cited by 4 Pith papers

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score. Full citation record

  1. Real-time observations of the transition to the quiescent state in an accreting magnetised neutron star: No propeller required?

    astro-ph.HE 2026-08 conditional novelty 6.0 of 10

    First high-cadence observation of an X-ray pulsar transition to quiescence shows a gradual exponential fade consistent with the disc instability model, without requiring the propeller effect.

  2. Magnetospheric flows in X-ray pulsars II: Heating, cooling and ionization degree at sub-critical accretion

    astro-ph.HE 2026-07 conditional novelty 6.0 of 10

    Sub-critical magnetospheric accretion flows in X-ray pulsars cool to tens of eV near the surface and become partially ionized, contrary to the standard fully-ionized assumption.

  3. Physics of Strong Magnetism with eXTP

    astro-ph.HE 2025-06 unverdicted novelty 3.0 of 10

    The eXTP mission's planned instruments would enable more sensitive X-ray polarization and timing observations of magnetars and accreting pulsars, potentially testing vacuum birefringence and probing magnetic field structures.

  4. X-Ray Views of Galactic Accreting Pulsars in High-Mass X-Ray Binaries

    astro-ph.HE 2024-12 accept novelty 1.0 of 10

    A concise review of the timing, spectral, and polarization properties of accreting X-ray pulsars in high-mass X-ray binaries, including recent IXPE results.

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