Observations of Low and Intermediate Spectral Peak Blazars with the Imaging X-ray Polarimetry Explorer

Kavli Affiliate: Herman L. Marshall

| First 5 Authors: Herman L. Marshall, Ioannis Liodakis, Alan P. Marscher, Niccolo Di Lalla, Svetlana G. Jorstad

| Summary:

We present X-ray polarimetry observations from the Imaging X-ray Polarimetry
Explorer (IXPE) of three low spectral peak and one intermediate spectral peak
blazars, namely 3C 273, 3C 279, 3C 454.3, and S5 0716+714. For none of these
objects was IXPE able to detect X-ray polarization at the 3$sigma$ level.
However, we placed upper limits on the polarization degree at $sim$10-30%.
The undetected polarizations favor models where the X-ray band is dominated by
unpolarized photons upscattered by relativistic electrons in the jets of
blazars, although hadronic models are not completely eliminated. We discuss the
X-ray polarization upper limits in the context of our contemporaneous
multiwavelength polarization campaigns.

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