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Abstract <p>Long uninterrupted 4–25 keV observations of the X-ray pulsar Her X-1 with a total exposure of about two days around the 35-day cycle beginning were performed by the Mikhail Pavlinsky ART-XC telescope of the Spectrum-Röntgen-Gamma observatory. The main turn-on of the 35-day cycle was found to occur at the orbital phase <InlineEquation ID="IEq1"> <EquationSource Format="TEX">\({\sim}0.25\)</EquationSource> <!--BPhysMGU2570158Revnivtsev-m1--> </InlineEquation>, which is confirmed by simultaneous measurements from SWIFT/BAT and Fermi/GBM monitors. The form of rapid X-ray flux increase after the turn-on is similar in all instruments and can also describe the IXPE measurements of another turn-on and can be attributed to scattering by accretion disk opening the source. The quasi-sine like X-ray light curve before the turn-on suggests the nutation of a tilted precessing accretion disk with a period of <InlineEquation ID="IEq2"> <EquationSource Format="TEX">\({\sim}0.87\)</EquationSource> <!--BPhysMGU2570158Revnivtsev-m2--> </InlineEquation> days.</p>

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X-Ray Observations near the Turn-On of X-Ray Pulsar Her X-1

  • 期刊论文

  • 发表日期：

    2025年12月1日

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  • V. M. Revnivtsev,
  • K. A. Postnov,
  • S. V. Molkov,
  • N. I. Shakura

摘要

Abstract

Long uninterrupted 4–25 keV observations of the X-ray pulsar Her X-1 with a total exposure of about two days around the 35-day cycle beginning were performed by the Mikhail Pavlinsky ART-XC telescope of the Spectrum-Röntgen-Gamma observatory. The main turn-on of the 35-day cycle was found to occur at the orbital phase \({\sim}0.25\) , which is confirmed by simultaneous measurements from SWIFT/BAT and Fermi/GBM monitors. The form of rapid X-ray flux increase after the turn-on is similar in all instruments and can also describe the IXPE measurements of another turn-on and can be attributed to scattering by accretion disk opening the source. The quasi-sine like X-ray light curve before the turn-on suggests the nutation of a tilted precessing accretion disk with a period of \({\sim}0.87\) days.