Stability of the Cyclotron Resonance Scattering Feature in Her X-1 with RXTE

Details Stability of the Cyclotron Resonance Scattering Feature in Her X-1 with RXTE Stability of the Cyclotron Resonance Scattering Feature in Her X-1 with RXTE

2001-12-19

arxiv.org/abs/astro-ph/0112439v1

Astrophysical Journal 562, 449 (2001)

Astronomy and Astrophysics

Astrophysics

30 page, 5 figures

Scientific paper

10.1086/323487

Five observations of the hard X-ray spectrum of Her X-1 from \xte show that the $\sim 41$ keV energy of the cyclotron scattering line is constant within statistics of a few percent per observtion. Comparison with other observations over many years indicates strongly that the centroid energy of this absorption line has increased some time between 1991 and 1993 by 23%, from 34 keV to 41 keV. Moreover, the cutoff energy of the spectral continuum increased at the same time from 16 keV to 20 keV, which is, within the statistical error of 5%, in direct proportion to the centroid. This may be a sign thatboth these characteristics of the spectrum are controlled in the same way by the magnetic field strength in the region of scattering.

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