Detection of X-ray Polarization in the High Synchrotron Peaked Blazar 1ES 1959+650
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| Main Authors: | , , , , , , |
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| Format: | Preprint |
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2023
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| _version_ | 1866917768708751360 |
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| author | Bharathan, Athira M. Stalin, C. S. Chatterjee, Rwitika Sahayanathan, S. Pal, Indrani Mathew, Blesson Agrawal, Vivek K. |
| author_facet | Bharathan, Athira M. Stalin, C. S. Chatterjee, Rwitika Sahayanathan, S. Pal, Indrani Mathew, Blesson Agrawal, Vivek K. |
| contents | We report the measurement of X-ray polarization in the high synchrotron peaked blazar 1ES 1959+650. Of the four epochsof observations from the {\it Imaging X-ray Polarimetry Explorer}, we detected polarization in the 2$-$8 keV band on two epochs. From model-independent analysis of the observations on 28 October 2022, in the 2$-$8 keV band, we found the degree of polarization of $Π_X$ = 9.0 $\pm$ 1.6\% and an electric vector position angle of $ψ_X$ = 53 $\pm$ 5 deg. Similarly, from the observations on 14 August 2023, we found $Π_X$ and $ψ_X$ values as 12.5 $\pm$ 0.7\% and 20 $\pm$ 2 deg, respectively. These values are also in agreement with the values obtained from spectro-polarimetric analysis of the I, Q, and U spectra. The measured X-ray polarization is larger than the reported values in the optical, that ranges between 2.5$-$9\% , when observed during 2008 to 2018. Broadband spectral energy distribution constructed for the two epochs are well described by the one zone leptonic emission model with the bulk Lorentz factor ($Γ$) of the jet larger on 14 August 2023 compared to 28 October 2022. Our results favour shock acceleration of the particles in the jet, with the difference in $Π_X$ between the two epochs being influenced by change in the $Γ$ of the jet. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2311_01745 |
| institution | arXiv |
| publishDate | 2023 |
| record_format | arxiv |
| spellingShingle | Detection of X-ray Polarization in the High Synchrotron Peaked Blazar 1ES 1959+650 Bharathan, Athira M. Stalin, C. S. Chatterjee, Rwitika Sahayanathan, S. Pal, Indrani Mathew, Blesson Agrawal, Vivek K. High Energy Astrophysical Phenomena We report the measurement of X-ray polarization in the high synchrotron peaked blazar 1ES 1959+650. Of the four epochsof observations from the {\it Imaging X-ray Polarimetry Explorer}, we detected polarization in the 2$-$8 keV band on two epochs. From model-independent analysis of the observations on 28 October 2022, in the 2$-$8 keV band, we found the degree of polarization of $Π_X$ = 9.0 $\pm$ 1.6\% and an electric vector position angle of $ψ_X$ = 53 $\pm$ 5 deg. Similarly, from the observations on 14 August 2023, we found $Π_X$ and $ψ_X$ values as 12.5 $\pm$ 0.7\% and 20 $\pm$ 2 deg, respectively. These values are also in agreement with the values obtained from spectro-polarimetric analysis of the I, Q, and U spectra. The measured X-ray polarization is larger than the reported values in the optical, that ranges between 2.5$-$9\% , when observed during 2008 to 2018. Broadband spectral energy distribution constructed for the two epochs are well described by the one zone leptonic emission model with the bulk Lorentz factor ($Γ$) of the jet larger on 14 August 2023 compared to 28 October 2022. Our results favour shock acceleration of the particles in the jet, with the difference in $Π_X$ between the two epochs being influenced by change in the $Γ$ of the jet. |
| title | Detection of X-ray Polarization in the High Synchrotron Peaked Blazar 1ES 1959+650 |
| topic | High Energy Astrophysical Phenomena |
| url | https://arxiv.org/abs/2311.01745 |