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Inversion of the decay of the cyclotron line energy in Her X-1

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arxiv 1710.05150 v1 pith:U4TPLQTJ submitted 2017-10-14 astro-ph.HE

R. Staubert , D. Klochkov , F. Fürst , J. Wilms , R.E. Rothschild , F. Harrison This is my paper
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keywords decayinversioncyclotronenergylineobservationsaccretionaround
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Recent observations of Her X-1 with NuSTAR and INTEGRAL in 2016 have provided evidence that the 20-year decay of the cyclotron line energy found between 1996 and 2015 has ended and that an inversion with a new increase, possibly similar to the one observed around 1990-1993, has started. We consider this a strong motivation for further observations and for enhanced efforts to significantly improve our theoretical understanding of the accretion process in binary X-ray pulsars. We speculate about the physics behind the long-term decay and its inversion, a possible cyclic behavior, and correlations with other variable observables.

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