Polarisation Leakage due to Errors in Track Reconstruction in Gas Pixel Detectors
| Autor: | Bucciantini, N., Di Lalla, N., Romani, R. W. R., Silvestri, S., Negro, M., Baldini, L., Tennant, A. F., Manfreda, A. |
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| Rok vydání: | 2023 |
| Předmět: | |
| Zdroj: | A&A 672, A66 (2023) |
| Druh dokumentu: | Working Paper |
| DOI: | 10.1051/0004-6361/202245744 |
| Popis: | X-ray polarimetry, based on Gas Pixel Detectors (GPDs), have reached a high level of maturity with the Imaging X-ray Polarimeter Explorer (IXPE) leading to the first ever spatially resolved polarimetric measures. However, being this a new technique, a few unexpected effect have emerged during in flight operations. In particular it was almost immediately found that on-board unpolarized calibration sources were showing radially polarized halos. The origin of this features was recognized in a correlation between the error in reconstructing the absorption point of the X-ray photon and the direction of its electric field vector. Here we present and discuss in detail this effect, showing that it is possible to provide a simple and robust mathematical formalism to handle it. We further show its role and relevance for the recent IXPE measures, and for the use of GPD-based techniques in general, and illustrate how to model it in the study of extended sources. Comment: 19 pages, 10 figures, to be published in A&A |
| Databáze: | arXiv |
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