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Título: | The X-ray evolution and geometry of the 2018 outburst of XTE J1810-197 |
Autor: | Borghese, Alice CSIC ORCID; Rea, Nanda CSIC ORCID; Rigoselli, M.; Alford, J. A. J.; Gotthelf, E. V.; Burgay, M.; Possenti, Alessia; Zane, Silvia; Coti Zelati, Francesco CSIC ORCID ; Perna, R.; Esposito, Paolo; Mereghetti, S.; Viganò, Daniele CSIC ORCID; Tiengo, Andrea; Götz, Diego; Ibrahim, A. Y. CSIC ORCID; Israel, Gian Luca; Pons, José A.; Sathyaprakash, R. CSIC ORCID | Palabras clave: | Stars: individual: XTE J1810-197 Stars: magnetars Stars: neutron X-ray bursts |
Fecha de publicación: | 30-abr-2021 | Editor: | Royal Astronomical Society | Citación: | Monthly Notices of the Royal Astronomical Society 504(4): 5244-5257 (2021) | Resumen: | After 15 yr, in late 2018, the magnetar XTE J1810-197 underwent a second recorded X-ray outburst event and reactivated as a radio pulsar. We initiated an X-ray monitoring campaign to follow the timing and spectral evolution of the magnetar as its flux decays using Swift, XMM-Newton, NuSTAR, and NICER observations. During the year-long campaign, the magnetar reproduced similar behaviour to that found for the first outburst, with a factor of 2 change in its spin-down rate from ∼7.2 × 10-12 to ∼1.5 × 10-11 s s-1 after two months. Unique to this outburst, we confirm the peculiar energy-dependent phase shift of the pulse profile. Following the initial outburst, the spectrum of XTE J1810-197 is well modelled by multiple blackbody components corresponding to a pair of non-concentric, hot thermal caps surrounded by a cooler one, superposed to the colder star surface. We model the energy-dependent pulse profile to constrain the viewing and surface emission geometry and find that the overall geometry of XTE J1810-197 has likely evolved relative to that found for the 2003 event. | Versión del editor: | http://doi.org/10.1093/mnras/stab1236 | URI: | http://hdl.handle.net/10261/262446 | DOI: | 10.1093/mnras/stab1236 | Identificadores: | doi: 10.1093/mnras/stab1236 issn: 1365-2966 |
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X-ray_evolution_n_geometry_XTE_J1810-197.pdf | 5,69 MB | Adobe PDF | Visualizar/Abrir |
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