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Handling Background in IXPE polarimetric data

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arxiv 2302.02927 v1 pith:LNCEQJFJ submitted 2023-02-06 astro-ph.IM astro-ph.HE

Alessandro Di Marco , Paolo Soffitta , Enrico Costa , Riccardo Ferrazzoli , Fabio La Monaca , John Rankin , Ajay Ratheesh , Fei Xie
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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
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keywords ixpebackgroundpolarimetricanalysisexplorerobservationobservationspolarimetry
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abstract

IXPE (Imaging X-ray Polarimetry Explorer) is a Small Explorer mission by NASA and ASI, launched on December 9$^{th}$ 2021, dedicated to investigating X-ray polarimetry allowing angular-, time- and energy-resolved observations in the 2--8 keV energy band. IXPE is in Science Observation phase since January 2022; it comprises of three identical telescopes with grazing-incidence mirrors, each one having in the focal plane a Gas Pixel Detector (GPD). 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.

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Cited by 4 Pith papers

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score. Full citation record

  1. Real-time observations of the transition to the quiescent state in an accreting magnetised neutron star: No propeller required?

    astro-ph.HE 2026-08 conditional novelty 6.0 of 10

    First high-cadence observation of an X-ray pulsar transition to quiescence shows a gradual exponential fade consistent with the disc instability model, without requiring the propeller effect.

  2. Peering through the dip: IXPE unveils the extended scattering environment of GX 13+1

    astro-ph.HE 2026-07 conditional novelty 6.0 of 10

    During the periodic dip of GX 13+1, X-ray polarization rises to 9.1%±1.1% and rotates by ~60° relative to the off-dip state, consistent with scattering in an oblate corona or disk wind.

  3. Unchanged X-Ray Polarization During Accretion Dips in the Low Hard State of Cygnus X-1

    astro-ph.HE 2026-07 conditional novelty 6.0 of 10

    During Cygnus X-1 accretion dips the 2–8 keV polarization is unchanged within errors, indicating the absorbed disk does not contribute and supporting an extended oblate corona.

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

    astro-ph.HE 2026-04 conditional novelty 3.0 of 10

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

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