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X-Ray Observations near the Turn-on of X-Ray Pulsar Her X-1статья
- Авторы: Revnivtsev V.M., Postnov K.A., Molkov S.V., Shakura N.I.
- Журнал: Moscow University Physics Bulletin
- Том: 80
- Номер: Suppl. 1
- Год издания: 2025
- Издательство: Allerton Press
- Местоположение издательства: New York, N.Y., United States
- Первая страница: S138
- Последняя страница: S140
- Аннотация: 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-R ¨ontgen-Gamma observatory. The main turn-on of the 35-day cycle was found to occur at the orbital phase ∼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 ∼0.87 days.
- Добавил в систему: Ревнивцев Владислав Михайлович