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Malacaria, Christian; Heyl, Jeremy; Doroshenko, Victor; Tsygankov, Sergey S.; Poutanen, Juri; Forsblom, Sofia V.; Capitanio, Fiamma; Di Marco, Alessandro; Du, Yujia; Ducci, Lorenzo; La Monaca, Fabio; Lutovinov, Alexander A.; Marshall, Herman L.; Mereminskiy, Ilya A.; Molkov, Sergey V.; Mushtukov, Alexander A.; Ng, Mason; Petrucci, Pierre-Olivier; Santangelo, Andrea; Shtykovsky, Andrey E.; Suleimanov, Valery F.; Agudo, Iván; Antonelli, Lucio A.; Bachetti, Matteo; [...]

A polarimetrically oriented X-ray stare at the accreting pulsar EXO 2030+375

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  • Medientyp: E-Artikel
  • Titel: A polarimetrically oriented X-ray stare at the accreting pulsar EXO 2030+375
  • Beteiligte: Malacaria, Christian; Heyl, Jeremy; Doroshenko, Victor; Tsygankov, Sergey S.; Poutanen, Juri; Forsblom, Sofia V.; Capitanio, Fiamma; Di Marco, Alessandro; Du, Yujia; Ducci, Lorenzo; La Monaca, Fabio; Lutovinov, Alexander A.; Marshall, Herman L.; Mereminskiy, Ilya A.; Molkov, Sergey V.; Mushtukov, Alexander A.; Ng, Mason; Petrucci, Pierre-Olivier; Santangelo, Andrea; Shtykovsky, Andrey E.; Suleimanov, Valery F.; Agudo, Iván; Antonelli, Lucio A.; Bachetti, Matteo; [...]
  • Erschienen: EDP Sciences, 2023
  • Erschienen in: Astronomy & Astrophysics
  • Sprache: Nicht zu entscheiden
  • DOI: 10.1051/0004-6361/202346581
  • ISSN: 0004-6361; 1432-0746
  • Schlagwörter: Space and Planetary Science ; Astronomy and Astrophysics
  • Entstehung:
  • Anmerkungen:
  • Beschreibung: <jats:p>Accreting X-ray pulsars (XRPs) are presumed to be ideal targets for polarization measurements, as their high magnetic field strength is expected to polarize the emission up to a polarization degree of ∼80%. However, such expectations are being challenged by recent observations of XRPs with the Imaging X-ray Polarimeter Explorer (IXPE). Here, we report on the results of yet another XRP, namely, EXO 2030+375, observed with IXPE and contemporarily monitored with Insight-HXMT and SRG/ART-XC. In line with recent results obtained with IXPE for similar sources, an analysis of the EXO 2030+375 data returns a low polarization degree of 0%–3% in the phase-averaged study and a variation in the range of 2%–7% in the phase-resolved study. Using the rotating vector model, we constrained the geometry of the system and obtained a value of ∼60° for the magnetic obliquity. When considering the estimated pulsar inclination of ∼130°, this also indicates that the magnetic axis swings close to the observer’s line of sight. Our joint polarimetric, spectral, and timing analyses hint toward a complex accreting geometry, whereby magnetic multipoles with an asymmetric topology and gravitational light bending significantly affect the behavior of the observed source.</jats:p>
  • Zugangsstatus: Freier Zugang