Interpreting the X-ray state transitions of Cygnus X-1

Abstract

We present a novel method for interpreting observations of high-mass X-ray binaries (HMXBs) based on a combination of spectroscopic data and numerical results from a radiation hydrodynamic model of stellar winds. We calculate synthetic Doppler tomograms of predicted emission in low/hard and high/soft X-ray states and compare them with Doppler tomograms produced using spectra of Cygnus X-1, a prototype of HMXBs. Emission from HMXBs is determined by local conditions within the circumstellar medium, namely density, temperature, and ionization state. These quantities depend strongly on the X-ray state of the systems. By increasing intensity of an X-ray emission produced by the compact companion in the HMXB model, we achieved a complete redistribution of the circumstellar medium in the vicinity of the modelled system. These changes (which simulate the transitions between two major spectral states) are also apparent in the synthetic Doppler tomograms which are in good agreement with the observations.

arXiv comment12 pages, 10 figures, 3 tables. arXiv admin note: text overlap with arXiv:1303.1198 by other authors

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• Do Radio Active Galactic Nuclei Reflect X-ray Binary Spectral States?
• Quantifying jet-interstellar medium interactions in Cyg X-1: Insights from dual-frequency bow shock detection with MeerKAT
• Wind accretion in Cygnus X-1
• Compact stellar systems hosting an intermediate mass black hole: magnetohydrodynamic study of inflow-outflow dynamics
• Phase-Resolved Spectroscopy of the Low-Mass X-ray Binary V801 Ara
• Stellar Winds in Massive X-ray Binaries