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- W3106283654 abstract "We summarize the results of a dedicated effort made between 2012 and 2019 to follow the evolution of the cyclotron line in Her X-1 through repeated NuSTAR observations. The previously observed nearly 20-year-long decay of the cyclotron line energy has ended in 2012: from then on, the pulse-phase-averaged flux-corrected cyclotron line energy has remained stable and constant at an average value of E cyc = (37.44 ± 0.07) keV (normalized to a flux level of 6.8 RXTE/ASM-cts s −1 ). The flux dependence of E cyc discovered in 2007 is now measured with high precision, giving a slope of (0.675 ± 0.075) keV/(ASM-cts s −1 ), corresponding to an increase of 6.5% of E cyc for an increase in flux by a factor of two. We also find that all line parameters as well as the continuum parameters show a correlation with X-ray flux. While a correlation between E cyc and X-ray flux (both positive and negative) is now known for several accreting binaries with various suggestions for the underlying physics, the phenomenon of a long-term decay has so far only been seen in Her X-1 and Vela X-1, with far less convincing explanations." @default.
- W3106283654 created "2020-11-23" @default.
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- W3106283654 date "2020-10-01" @default.
- W3106283654 modified "2023-10-16" @default.
- W3106283654 title "Cyclotron line energy in Hercules X-1: stable after the decay" @default.
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- W3106283654 doi "https://doi.org/10.1051/0004-6361/202038855" @default.
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