Pulsars, transients and relativistic astrophysics

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Mass measurements and 3D orbital geometry of PSR J1933–6211

Astronomy & Astrophysics EDP Sciences 674 (2023) a169

Authors:

M Geyer, V Venkatraman Krishnan, PCC Freire, M Kramer, J Antoniadis, M Bailes, MCI Bernadich, S Buchner, AD Cameron, DJ Champion, A Karastergiou, MJ Keith, ME Lower, S Osłowski, A Possenti, A Parthasarathy, DJ Reardon, M Serylak, RM Shannon, R Spiewak, W van Straten, JPW Verbiest
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X-ray and near-infrared observations of the middle-aged pulsar B1055-52, its multiwavelength spectrum, and proper motion

(2023)

Authors:

B Posselt, GG Pavlov, O Kargaltsev, J Hare
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Studying the link between radio galaxies and AGN fuelling with relativistic hydrodynamic simulations of flickering jets

ArXiv 2305.19328 (2023)

Authors:

Henry W Whitehead, James H Matthews
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Studying the link between radio galaxies and AGN fuelling with relativistic hydrodynamic simulations of flickering jets

Monthly Notices of the Royal Astronomical Society Oxford University Press (OUP) 523:2 (2023) 2478-2497

Authors:

Henry W Whitehead, James H Matthews
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X-ray pulsar GRO J1008−57 as an orthogonal rotator

Astronomy & Astrophysics EDP Sciences 675 (2023) A48-A48

Authors:

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

Abstract:

X-ray polarimetry is a unique way to probe geometrical configuration of highly-magnetized accreting neutron stars (X-ray pulsars). GRO J1008$-$57 is the first transient X-ray pulsar observed at two different flux levels by the Imaging X-ray Polarimetry Explorer (IXPE) during its outburst in November 2022. The polarization properties were found to be independent of the source luminosity, with the polarization degree varying between non-detection to about 15% over the pulse phase. Fitting the phase-resolved spectro-polarimetric data with the rotating vector model allowed us to estimate the pulsar inclination (130 deg, which is in good agreement with the orbital inclination), the position angle (75 deg) of the pulsar spin axis, and the magnetic obliquity (74 deg). This makes GRO J1008$-$57 the first confidently identified X-ray pulsar as a nearly orthogonal rotator. The results are discussed in the context of the neutron star atmosphere models and theories of pulsars' axis alignment.Comment: 11 pages, 7 figures, submitted to A&A. arXiv admin note: text overlap with arXiv:2209.0244
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