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X-Ray Polarization of the BL Lacertae Type Blazar 1ES 0229+200

Ehlert, SR; Liodakis, I; Middei, R; Marscher, AP; Tavecchio, F; Agudo, I; Kouch, PM; ... Swartz, DA; + view all (2023) X-Ray Polarization of the BL Lacertae Type Blazar 1ES 0229+200. Astrophysical Journal , 959 (1) , Article 61. 10.3847/1538-4357/ad05c4. Green open access

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Abstract

We present polarization measurements in the 2-8 keV band from blazar 1ES 0229+200, the first extreme high synchrotron peaked source to be observed by the Imaging X-ray Polarimetry Explorer (IXPE). Combining two exposures separated by about two weeks, we find the degree of polarization to be ΠX = 17.9% ± 2.8% at an electric-vector position angle ψ X = 25.°0 ± 4.°6 using a spectro-polarimetric fit from joint IXPE and XMM-Newton observations. There is no evidence for the polarization degree or angle varying significantly with energy or time on both short timescales (hours) or longer timescales (days). The contemporaneous polarization degree at optical wavelengths was >7× lower, making 1ES 0229+200 the most strongly chromatic blazar yet observed. This high X-ray polarization compared to the optical provides further support that X-ray emission in high-peaked blazars originates in shock-accelerated, energy-stratified electron populations, but is in tension with many recent modeling efforts attempting to reproduce the spectral energy distribution of 1ES 0229+200, which attribute the extremely high energy synchrotron and Compton peaks to Fermi acceleration in the vicinity of strongly turbulent magnetic fields.

Type: Article
Title: X-Ray Polarization of the BL Lacertae Type Blazar 1ES 0229+200
Open access status: An open access version is available from UCL Discovery
DOI: 10.3847/1538-4357/ad05c4
Publisher version: http://dx.doi.org/10.3847/1538-4357/ad05c4
Language: English
Additional information: Original content from this work may be used under the terms of the Creative Commons Attribution 4.0 licence. Any further distribution of this work must maintain attribution to the author(s) and the title of the work, journal citation and DOI.
UCL classification: UCL
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Space and Climate Physics
URI: https://discovery.ucl.ac.uk/id/eprint/10184653
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