Handling the Background in IXPE Polarimetric Data
oleh: Alessandro Di Marco, Paolo Soffitta, Enrico Costa, Riccardo Ferrazzoli, Fabio La Monaca, John Rankin, Ajay Ratheesh, Fei Xie, Luca Baldini, Ettore Del Monte, Steven R. Ehlert, Sergio Fabiani, Dawoon E. Kim, Fabio Muleri, Stephen L. O’Dell, Brian D. Ramsey, Alda Rubini, Carmelo Sgrò, Stefano Silvestri, Allyn F. Tennant, Martin C. Weisskopf
| Format: | Article |
|---|---|
| Diterbitkan: | IOP Publishing 2023-01-01 |
Deskripsi
Imaging X-ray Polarimetry Explorer (IXPE) is a Small Explorer mission by NASA and Agenzia Spaziale Italiana, launched on 2021 December 9, dedicated to investigating X-ray polarimetry allowing angular-, time-, and energy-resolved observations in the 2–8 keV energy band. IXPE is in the science observation phase since 2022 January; it is comprised of three identical telescopes with grazing-incidence mirrors, each one having in the focal plane a gas pixel detector. In this paper, we present a possible guideline to obtain an optimal background selection in polarimetric analysis, and a rejection strategy to remove instrumental background. This work is based on the analysis of IXPE observations, aiming to improve as much as possible the polarimetric sensitivity. In particular, the developed strategies have been applied as a case study to the IXPE observation of the 4U 0142+61 magnetar.