Multiwavelength Polarization Observations of Mrk 501
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2024
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| author | Hu, Xin-Ke Yu, Yu-Wei Zhang, Jin Wang, Xiang-Gao Patra, Kishore C. Brink, Thomas G. Zheng, Wei-Kang Wang, Qi Kong, De-Feng Chen, Liang-Jun Zhou, Ji-Wang Cao, Jia-Xin Lu, Ming-Xuan Zhou, Zi-Min Wei, Yi-Ning Huang, Xin-Bo Li, Xing-Lin Lou, Hao Mao, Ji-Rong Liang, En-Wei Filippenko, Alexei V. |
| author_facet | Hu, Xin-Ke Yu, Yu-Wei Zhang, Jin Wang, Xiang-Gao Patra, Kishore C. Brink, Thomas G. Zheng, Wei-Kang Wang, Qi Kong, De-Feng Chen, Liang-Jun Zhou, Ji-Wang Cao, Jia-Xin Lu, Ming-Xuan Zhou, Zi-Min Wei, Yi-Ning Huang, Xin-Bo Li, Xing-Lin Lou, Hao Mao, Ji-Rong Liang, En-Wei Filippenko, Alexei V. |
| contents | Mrk 501 is a prototypical high-synchrotron-peaked blazar (HBL) and serves as one of the primary targets for the {\it Imaging X-ray Polarimetry Explorer} ({\it IXPE}). In this study, we report X-ray polarization measurements of Mrk 501 based on six {\it IXPE} observations. The detection of X-ray polarization at a confidence level exceeding 99\% is achieved in four out of the six observations conducted across the entire energy range (2--8 keV) of {\it IXPE}. The maximum polarization degree ($Π_{\rm X}$) is measured to be $15.8\%\pm2.8\%$, accompanied by a polarization angle ($ψ_{\rm X}$) of $98.0°\pm5.1°$ at a confidence level of $5.6 σ$. During the remaining two observations, only an upper limit of $Π_{\rm X}<$12\% could be derived at the 99\% confidence level. No temporal variability in polarization is observed throughout all six {\it IXPE} observations for Mrk 501. A discernible trend of energy-dependent variation in the polarization degree is detected in optical spectropolarimetry; however, no analogous indication is observed in $Π_{\rm X}$. The chromatic behavior of $Π$ and the consistent values of $ψ$ across different frequencies from X-rays to radio waves, along with the agreement between $ψ$ and jet position angle, strongly support the interpretation of the energy-stratified model with shock-accelerated particles in the jet of Mrk 501. Additionally, the possibility of the presence of a global helical magnetic field in the jet of Mrk 501 is discussed. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2402_11949 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Multiwavelength Polarization Observations of Mrk 501 Hu, Xin-Ke Yu, Yu-Wei Zhang, Jin Wang, Xiang-Gao Patra, Kishore C. Brink, Thomas G. Zheng, Wei-Kang Wang, Qi Kong, De-Feng Chen, Liang-Jun Zhou, Ji-Wang Cao, Jia-Xin Lu, Ming-Xuan Zhou, Zi-Min Wei, Yi-Ning Huang, Xin-Bo Li, Xing-Lin Lou, Hao Mao, Ji-Rong Liang, En-Wei Filippenko, Alexei V. High Energy Astrophysical Phenomena Mrk 501 is a prototypical high-synchrotron-peaked blazar (HBL) and serves as one of the primary targets for the {\it Imaging X-ray Polarimetry Explorer} ({\it IXPE}). In this study, we report X-ray polarization measurements of Mrk 501 based on six {\it IXPE} observations. The detection of X-ray polarization at a confidence level exceeding 99\% is achieved in four out of the six observations conducted across the entire energy range (2--8 keV) of {\it IXPE}. The maximum polarization degree ($Π_{\rm X}$) is measured to be $15.8\%\pm2.8\%$, accompanied by a polarization angle ($ψ_{\rm X}$) of $98.0°\pm5.1°$ at a confidence level of $5.6 σ$. During the remaining two observations, only an upper limit of $Π_{\rm X}<$12\% could be derived at the 99\% confidence level. No temporal variability in polarization is observed throughout all six {\it IXPE} observations for Mrk 501. A discernible trend of energy-dependent variation in the polarization degree is detected in optical spectropolarimetry; however, no analogous indication is observed in $Π_{\rm X}$. The chromatic behavior of $Π$ and the consistent values of $ψ$ across different frequencies from X-rays to radio waves, along with the agreement between $ψ$ and jet position angle, strongly support the interpretation of the energy-stratified model with shock-accelerated particles in the jet of Mrk 501. Additionally, the possibility of the presence of a global helical magnetic field in the jet of Mrk 501 is discussed. |
| title | Multiwavelength Polarization Observations of Mrk 501 |
| topic | High Energy Astrophysical Phenomena |
| url | https://arxiv.org/abs/2402.11949 |