A STUDY OF THE CYG X-1 SPECTRAL COMPONENTS IN RADIO, X, AND γ-RAYS: HIGH ENERGY POLARIMETRY, SPECTROSCOPY, AND THE RELATION WITH THE SPECTRAL STATE

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2015sf2a.conf..0175R.pdf (3.63 MB)

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http://sf2a.eu/proceedings/2015/2015sf2a.conf..0175R.pdf

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http://hdl.handle.net/11603/29551

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UMBC Center for Space Sciences and Technology (CSST) / Center for Research and Exploration in Space Sciences & Technology II (CRSST II)
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UMBC Physics Department

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https://orcid.org/0000-0002-4656-6881

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2015

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conference papers and proceedings
preprints
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Abstract

We present an analysis of AMI-Ryle (15 GHz) and INTEGRAL (0.01–2 MeV) observations of Cygnus X-1 performed between early 2003 and late 2012. The observations are separated into distinct spectral states thanks to a model-independent approach based on data acquired with All Sky Monitors. The multi-wavelength state-dependent properties of the source are then studied: a compact radio jet is detected in the hard and intermediate states and is absent in the soft state. We clearly detect a high energy tail dominating the 0.4–2 MeV emission in the hard state. This component is highly polarized and we suggest it to be the signature of jet emission at high energies.