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Timing properties of the X-ray accreting pulsar 1A 0535+262 studied with Insight-HXMT

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arxiv 2208.13340 v1 pith:FRH7BVLJ submitted 2022-08-29 astro-ph.HE

P. J. Wang , L. D. Kong , S. Zhang , V. Doroshenko , A. Santangelo , L. Ji , E. S. Yorgancioglu , Y. P. Chen
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S. N. Zhang J. L. Qu M. Y. Ge J. Li Z. Chang L. Tao J. Q. Peng Q. C. Shui
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keywords luminositypulsetimesanalysisenergyfirstfoundinsight-hxmt
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abstract

We report results on the timing analysis of the 2020 giant outburst of 1A 0535+262, using broadband data from Insight-HXMT. The analysis of the pulse profile evolution from the sub-critical luminosity to super-critical luminosity regime is presented for the first time. We found that the observed pulse profile exhibits a complex dependence on both energy and luminosity.A dip structure at the energy of the cyclotron resonant scattering features (CRSFs) is found for the first time in the pulse fraction-energy relation of 1A 0535+262, when the outburst evolves in a luminosity range from 4.8 $\times 10^{37}$ erg s$^{-1}$ to 1.0 $\times 10^{38}$ erg s$^{-1}$. The observed structure is luminosity dependent and appears around the source critical luminosity ($\sim$ 6.7 $\times 10^{37}$ erg s$^{-1}$).

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Cited by 2 Pith papers

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  1. 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.

  2. 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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