Long-term spectral study of the black hole Cygnus X-1 using INTEGRAL

F. Cangemi , T. Beuchert , T. Siegert , V. Grinberg , J. Wilms , J. Rodriguez , I. Kreykenbohm , P. Laurent

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K. Pottschmidt

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classification 🌌 astro-ph.HE

keywords polarisationanalysiscygnushigh-energyspectraltailaboveaddition

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We utilize the joint capabilities of IBIS and SPI to perform a state-resolved 20--2000\,keV analysis of the microquasar Cygnus X-1. In both LHS and HSS, the spectral analysis reveals the presence of a high-energy tail above 400\,keV in addition to a standard, Compton-like continuum in the 20--400\,keV range. We study the polarisation properties of the hard X-ray radiation, as well as of the polarisation of this high-energy tail. Polarisation is detected in the LHS in agreement with previous work. We find potential variations of the LHS polarisation with time and no polarisation detection in the HSS.

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Long-term spectral study of the black hole Cygnus X-1 using INTEGRAL

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