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arxiv: 2206.07582 · v1 · pith:ZMWNFWDDnew · submitted 2022-06-15 · 🌌 astro-ph.IM

Calibration of the IXPE focal plane X-ray polarimeters to polarized radiation

classification 🌌 astro-ph.IM
keywords detectorixpecalibrationx-raydedicatedexplorerfocalplane
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IXPE (Imaging X-ray Polarimetry Explorer) is a NASA Small Explorer mission -- in partnership with the Italian Space Agency (ASI) -- dedicated to X-ray polarimetry in the 2--8 keV energy band. The IXPE telescope comprises three grazing incidence mirror modules coupled to three detector units hosting each one a Gas Pixel Detector (GPD), a gas detector that allows measuring the polarization degree by using the photoelectric effect. A wide and accurate ground calibration was carried out on the IXPE Detector Units (DUs) at INAF-IAPS, in Italy, where a dedicated facility was set-up at this aim. In this paper, we present the results obtained from this calibration campaign to study the IXPE focal plane detector response to polarized radiation. In particular, we report on the modulation factor, which is the main parameter to estimate the sensitivity of a polarimeter.

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  1. The hitchhiker's guide to the IXPE data analysis

    astro-ph.HE 2026-04 accept novelty 2.0

    A user-oriented guide that collects best practices, data formats, and analysis strategies for extracting polarimetric information from IXPE observations.