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A model for cyclotron resonance scattering features
G. Schönherr, J. Wilms, P. Kretschmar +5
(abbreviated version of the abstract) We study the physics of cyclotron line formation in the high-energy spectra of accreting X-ray pulsars using Monte Carlo methods, assuming tha…
An ultraluminous supersoft source with a 4 hour modulation in NGC 4631
S. Carpano, A. M. T. Pollock, A. R. King +2
Context. Supersoft X-ray sources (SSSs) are characterised by very low temperatures (< 100 eV). Classical SSSs have bolometric luminosities in the range of 10^36-10^38 erg/s and are…
An X-ray Spectral Analysis of the Central Regions of NGC 4593
L. W. Brenneman, C. S. Reynolds, J. Wilms +1
We present a detailed analysis of XMM-Newton EPIC-pn data for the Seyfert-1 galaxy NGC 4593. We discuss the X-ray spectral properties of this source as well as its variations with…
A 33 hour period for the Wolf-Rayet/black hole X-ray binary candidate NGC 300 X-1
S. Carpano, A. M. T. Pollock, A. Prestwich +4
Context. NGC 300 X-1 is the second extragalactic candidate, after IC 10 X-1, in the rare class of Wolf-Rayet/compact object X-ray binary systems exemplified in the Galaxy by Cyg X-…
Long-term developments in Her X-1: Correlation between the histories of the 35 day turn-on cycle and the 1.24 sec pulse period
R. Staubert, S. Schandl, D. Klochkov +3
We have studied the long-term (1971-2005) behaviour of the 1.24 sec pulse period and the 35 day precession period of Her X-1 and show that both periods vary in a highly correlated…
Discovery of a flux-related change of the cyclotron line energy in Her X-1
R. Staubert, N. I. Shakura, K. Postnov +5
We present the results of ten years of repeated measurements of the Cyclotron Resonance Scattering Feature (CRSF) in the spectrum of the binary X-ray pulsar Her X-1 and report the…