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Tsygankov, Sergey S.; Doroshenko, Victor; Mushtukov, Alexander A.; Poutanen, Juri; Di Marco, Alessandro; Heyl, Jeremy; La Monaca, Fabio; Forsblom, Sofia V.; Malacaria, Christian; Marshall, Herman L.; Suleimanov, Valery F.; Svoboda, Jiri; Taverna, Roberto; Ursini, Francesco; Agudo, Iván; Antonelli, Lucio A.; Bachetti, Matteo; Baldini, Luca; Baumgartner, Wayne H.; Bellazzini, Ronaldo; Bianchi, Stefano; Bongiorno, Stephen D.; Bonino, Raffaella; Brez, Alessandro; [...]

X-ray pulsar GRO J1008−57 as an orthogonal rotator

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  • Medientyp: E-Artikel
  • Titel: X-ray pulsar GRO J1008−57 as an orthogonal rotator
  • Beteiligte: Tsygankov, Sergey S.; Doroshenko, Victor; Mushtukov, Alexander A.; Poutanen, Juri; Di Marco, Alessandro; Heyl, Jeremy; La Monaca, Fabio; Forsblom, Sofia V.; Malacaria, Christian; Marshall, Herman L.; Suleimanov, Valery F.; Svoboda, Jiri; Taverna, Roberto; Ursini, Francesco; Agudo, Iván; Antonelli, Lucio A.; Bachetti, Matteo; Baldini, Luca; Baumgartner, Wayne H.; Bellazzini, Ronaldo; Bianchi, Stefano; Bongiorno, Stephen D.; Bonino, Raffaella; Brez, Alessandro; [...]
  • Erschienen: EDP Sciences, 2023
  • Erschienen in: Astronomy & Astrophysics
  • Sprache: Nicht zu entscheiden
  • DOI: 10.1051/0004-6361/202346134
  • ISSN: 0004-6361; 1432-0746
  • Schlagwörter: Space and Planetary Science ; Astronomy and Astrophysics
  • Entstehung:
  • Anmerkungen:
  • Beschreibung: <jats:p>X-ray polarimetry is a unique way to probe the geometrical configuration of highly magnetized accreting neutron stars (X-ray pulsars). GRO J1008−57 is the first transient X-ray pulsar observed at two different flux levels by the Imaging X-ray Polarimetry Explorer (IXPE) during its outburst in November 2022. We find the polarization properties of GRO J1008−57 to be independent of its luminosity, with the polarization degree varying between nondetection and about 15% over the pulse phase. Fitting the phase-resolved spectro-polarimetric data with the rotating vector model allowed us to estimate the pulsar inclination (130°, which is in good agreement with the orbital inclination), the position angle (75°) of the pulsar spin axis, and the magnetic obliquity (∼74°). This makes GRO J1008−57 the first confidently identified nearly orthogonal rotator among X-ray pulsars. We discuss our results in the context of the neutron star atmosphere models and theories of the axis alignment of accreting pulsars.</jats:p>
  • Zugangsstatus: Freier Zugang