High hard X-ray polarization in Cygnus X-1 confined to the intermediate hard state: evidence for a variable jet component
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| Main Authors: | , , , , , , , , , |
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| Format: | Preprint |
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2023
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| _version_ | 1866910284178784256 |
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| author | Chattopadhyay, Tanmoy Kumar, Abhay Rao, A. R. Bhargava, Yash Vadawale, Santosh V. Ratheesh, Ajay Dewangan, Gulab Bhattacharyay, Dipankar S., Mithun N. P. Bhalerao, Varun |
| author_facet | Chattopadhyay, Tanmoy Kumar, Abhay Rao, A. R. Bhargava, Yash Vadawale, Santosh V. Ratheesh, Ajay Dewangan, Gulab Bhattacharyay, Dipankar S., Mithun N. P. Bhalerao, Varun |
| contents | Cygnus X-1, the well-known accreting black hole system, exhibits several observational features hinting at an intricate interplay between the accretion disk, its atmosphere known as the corona and the putative relativistic jet. It has been extensively studied using all available observational methods, including using the newly available technique of sensitive X-ray polarimetry. X-ray polarization characteristics are distinct for coronal and jet emissions. The low X-ray polarization measured below $\sim$100 keV is understood as arising from the corona. In contrast, the high polarization measurements reported above $\sim$400 keV required a separate jet-dominated spectral component, which spectroscopy does not demonstrate conclusively. Here we report precise polarization measurements in the 100-380 keV region made during three different sub-classes of spectral states of the source using the CZTI instrument onboard {\em AstroSat}. A high polarization (23$\pm$4 \%) is found mainly in the Intermediate Hard State of the source, and the energy-resolved measurements smoothly connect the coronal and the jet regimes. When high polarization is observed, the simultaneous spectral data hints at a separate power law component above 100 keV. We examine the possible sources of this energy-dependent high polarization in Cygnus X-1. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2306_04057 |
| institution | arXiv |
| publishDate | 2023 |
| record_format | arxiv |
| spellingShingle | High hard X-ray polarization in Cygnus X-1 confined to the intermediate hard state: evidence for a variable jet component Chattopadhyay, Tanmoy Kumar, Abhay Rao, A. R. Bhargava, Yash Vadawale, Santosh V. Ratheesh, Ajay Dewangan, Gulab Bhattacharyay, Dipankar S., Mithun N. P. Bhalerao, Varun High Energy Astrophysical Phenomena Instrumentation and Methods for Astrophysics Cygnus X-1, the well-known accreting black hole system, exhibits several observational features hinting at an intricate interplay between the accretion disk, its atmosphere known as the corona and the putative relativistic jet. It has been extensively studied using all available observational methods, including using the newly available technique of sensitive X-ray polarimetry. X-ray polarization characteristics are distinct for coronal and jet emissions. The low X-ray polarization measured below $\sim$100 keV is understood as arising from the corona. In contrast, the high polarization measurements reported above $\sim$400 keV required a separate jet-dominated spectral component, which spectroscopy does not demonstrate conclusively. Here we report precise polarization measurements in the 100-380 keV region made during three different sub-classes of spectral states of the source using the CZTI instrument onboard {\em AstroSat}. A high polarization (23$\pm$4 \%) is found mainly in the Intermediate Hard State of the source, and the energy-resolved measurements smoothly connect the coronal and the jet regimes. When high polarization is observed, the simultaneous spectral data hints at a separate power law component above 100 keV. We examine the possible sources of this energy-dependent high polarization in Cygnus X-1. |
| title | High hard X-ray polarization in Cygnus X-1 confined to the intermediate hard state: evidence for a variable jet component |
| topic | High Energy Astrophysical Phenomena Instrumentation and Methods for Astrophysics |
| url | https://arxiv.org/abs/2306.04057 |