Contemporaneous X-ray and Optical Polarization of EHSP Blazar H 1426+428
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2025
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| author | Banerjee, Anuvab Garg, Akash Rawat, Divya Jorstad, Svetlana Marscher, Alan P. Agudo, Ivan Otero-Santos, Jorge Morcuende, Daniel Pedrosa, Juan Escudero Dominguez, Alberto Bhattacharjee, Ayan Cox, Isaiah Pal, Indrani Zhao, Xiurui Pizzetti, Andrealuna Marchesi, Stefano Torres-Alba, Nuria Imam, Kouser Silver, Ross Ajello, Marco |
| author_facet | Banerjee, Anuvab Garg, Akash Rawat, Divya Jorstad, Svetlana Marscher, Alan P. Agudo, Ivan Otero-Santos, Jorge Morcuende, Daniel Pedrosa, Juan Escudero Dominguez, Alberto Bhattacharjee, Ayan Cox, Isaiah Pal, Indrani Zhao, Xiurui Pizzetti, Andrealuna Marchesi, Stefano Torres-Alba, Nuria Imam, Kouser Silver, Ross Ajello, Marco |
| contents | We present the first contemporaneous X-ray and optical polarimetric measurement of the extremely high synchrotron peaked (EHSP) blazar H 1426+428. The X-ray polarimetric observations were undertaken using the Imaging X-ray Polarimetry Explorer (\textit{IXPE}) on 2024 May 27, and 2024 July 5. The \textit{IXPE} pointings were accompanied by contemporaneous optical observations of the Observatorio de Sierra Nevada, Calar Alto Observatory and the Perkins Telescope Observatory. While we observed the X-ray degree of polarization to be $>20\%$, the polarization in the optical band was found to be only $1-3\%$. This trend has been observed in several HSP blazars with available optical and X-ray polarimetric data and is typically explained in terms of energy stratification downstream of a shock. However, we observed a significant difference between the optical and X-ray polarization angles, a feature that has been observed in certain HSP blazars, such as Mrk 421, but remains a relatively rare or underreported phenomenon. We discuss possible scenarios for these findings within the framework of a partially turbulent jet model. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2504_12410 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Contemporaneous X-ray and Optical Polarization of EHSP Blazar H 1426+428 Banerjee, Anuvab Garg, Akash Rawat, Divya Jorstad, Svetlana Marscher, Alan P. Agudo, Ivan Otero-Santos, Jorge Morcuende, Daniel Pedrosa, Juan Escudero Dominguez, Alberto Bhattacharjee, Ayan Cox, Isaiah Pal, Indrani Zhao, Xiurui Pizzetti, Andrealuna Marchesi, Stefano Torres-Alba, Nuria Imam, Kouser Silver, Ross Ajello, Marco High Energy Astrophysical Phenomena We present the first contemporaneous X-ray and optical polarimetric measurement of the extremely high synchrotron peaked (EHSP) blazar H 1426+428. The X-ray polarimetric observations were undertaken using the Imaging X-ray Polarimetry Explorer (\textit{IXPE}) on 2024 May 27, and 2024 July 5. The \textit{IXPE} pointings were accompanied by contemporaneous optical observations of the Observatorio de Sierra Nevada, Calar Alto Observatory and the Perkins Telescope Observatory. While we observed the X-ray degree of polarization to be $>20\%$, the polarization in the optical band was found to be only $1-3\%$. This trend has been observed in several HSP blazars with available optical and X-ray polarimetric data and is typically explained in terms of energy stratification downstream of a shock. However, we observed a significant difference between the optical and X-ray polarization angles, a feature that has been observed in certain HSP blazars, such as Mrk 421, but remains a relatively rare or underreported phenomenon. We discuss possible scenarios for these findings within the framework of a partially turbulent jet model. |
| title | Contemporaneous X-ray and Optical Polarization of EHSP Blazar H 1426+428 |
| topic | High Energy Astrophysical Phenomena |
| url | https://arxiv.org/abs/2504.12410 |