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The supernova impostor SN 2010da located in the nearby galaxy NGC 300, later identified as a likely supergiant B[e] high-mass X-ray binary, was simultaneously observed by NuSTAR and XMM–Newton between 2016 December 16 and 20, over a total time span of ∼310 ks. We report the discovery of a strong periodic modulation in the X-ray flux with a pulse period of 31.6 s and a very rapid spin-up, and confirm therefore that the compact object is a neutron star. We find that the spin period is changing from 31.71 s to 31.54 s over that period, with a spin-up rate of −5.56 × 10^(−7) s s^(−1), likely the largest ever observed from an accreting neutron star. The spectrum is described by a power-law and a disc blackbody model, leading to a 0.3–30 keV unabsorbed luminosity of 4.7 × 10^(39) erg s^(−1). Applying our best-fitting model successfully to the spectra of an XMM–Newton observation from 2010, suggests that the lower fluxes of NGC 300 ULX1 reported from observations around that time are caused by a large amount of absorption, while the intrinsic luminosity was similar as seen in 2016. A more constant luminosity level is also consistent with the long-term pulse period evolution approaching an equilibrium value asymptotically. We conclude that the source is another candidate for the new class of ultraluminous X-ray pulsars.

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Caltech Authors  


Carpano, S. -  Haberl, F. -  Maitra, C. -  Vasilopoulos, G. - 

Id.: 71070223

Versión: 1.0

Estado: Final

Tipo:  application/pdf - 

Tipo de recurso: Article  -  PeerReviewed  - 

Tipo de Interactividad: Expositivo

Nivel de Interactividad: muy bajo

Audiencia: Estudiante  -  Profesor  -  Autor  - 

Estructura: Atomic

Coste: no

Copyright: sí

Formatos:  application/pdf - 

Requerimientos técnicos:  Browser: Any - 

Relación: [References] http://resolver.caltech.edu/CaltechAUTHORS:20180308-140547917
[References] https://authors.library.caltech.edu/85210/

Fecha de contribución: 06-jun-2018


* Carpano, S. and Haberl, F. and Maitra, C. and Vasilopoulos, G. (2018) Discovery of pulsations from NGC 300 ULX1 and its fast period evolution. Monthly Notices of the Royal Astronomical Society: Letters, 476 (1). L45-L49. ISSN 1745-3925. http://resolver.caltech.edu/CaltechAUTHORS:20180308-140547917

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