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19 April 2024

» arxiv » 1707.1514

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Chandra monitoring of the Galactic Centre magnetar SGR J1745-2900 during the initial 3.5 years of outburst decay
F. Coti Zelati ; N. Rea ; R. Turolla ; J. A. Pons ; A. Papitto ; P. Esposito ; G. L. Israel ; S. Campana ; S. Zane ; A. Tiengo ; R. P. Mignani ; S. Mereghetti ; F. K. Baganoff ; D. Haggard ; G. Ponti ; D. F. Torres ; A. Borghese ; J. Elfritz ;
Date:	5 Jul 2017
Abstract:	We report on 3.5 years of Chandra monitoring of the Galactic Centre magnetar SGR J1745-2900 since its outburst onset in April 2013. The magnetar spin-down has shown at least two episodes of period derivative increases so far, and it has slowed down regularly in the past year or so. We observed a slightly increasing trend in the time evolution of the pulsed fraction, up to about 55 per cent in the most recent observations. SGR J1745-2900 has not reached the quiescent level yet, and so far the overall outburst evolution can be interpreted in terms of a cooling hot region on the star surface. We discuss possible scenarios, showing in particular how the presence of a shrinking hot spot in this source is hardly reconcilable with internal crustal cooling and favors the untwisting bundle model for this outburst. Moreover, we also show how the emission from a single uniform hot spot is incompatible with the observed pulsed fraction evolution for any pair of viewing angles, suggesting an anisotropic emission pattern.
Source:	arXiv, 1707.1514
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