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Multi-wavelength Observations of Blazars Including X-ray Polarization

Presentation #402.02 in the session Probing Blazar Jets with Multi-wavelength Polarization.

Published onMay 03, 2024
Multi-wavelength Observations of Blazars Including X-ray Polarization

The Imaging X-ray Polarimetry Explorer (IXPE) is equipped to measure fluxes, spectral characteristics, and polarization properties of blazars within at X-ray energies (2-8 keV). To effectively utilize the IXPE results for constraining the geometry of the magnetic field in the X-ray emitting region and refining models for particle acceleration in relativistic jets, it is necessary to complement these measurements with observations across various energy bands, including radio, optical, X-ray, and gamma-ray. This presentation outlines the diverse set of observations that complement blazar studies with IXPE, emphasizing key findings obtained during the initial two years of X-ray polarization observations. Specifically, we discuss the influence of additional observational data on the interpretation of X-ray polarization results. We will highlight results from radio interferometry observations, which determine the orientation of the large-scale jet, as well as optical polarization measurements providing constraints on the magnetic field order experienced by electrons emitting at smaller synchrotron energies. Additionally, we will cover how the incorporation of soft and hard X-ray data aids in determining spectral curvature within the IXPE band, and how gamma-ray observations constrain the Compton cooling rate experienced by electrons responsible for the emission observed in the IXPE band.

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