SIMBAD references

2017MNRAS.471.1819C - Mon. Not. R. Astron. Soc., 471, 1819-1829 (2017/October-3)

Chandra monitoring of the Galactic Centre magnetar SGR J1745-2900 during the initial 3.5 years of outburst decay.

COTI ZELATI F., REA N., TUROLLA R., PONS J.A., PAPITTO A., ESPOSITO P., ISRAEL G.L., CAMPANA S., ZANE S., TIENGO A., MIGNANI R.P., MEREGHETTI S., BAGANOFF F.K., HAGGARD D., PONTI G., TORRES D.F., BORGHESE A. and ELFRITZ J.

Abstract (from CDS):

We report on 3.5 yr of Chandra monitoring of the Galactic Centre magnetar SGR J1745-2900 since its outburst onset in 2013 April. 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 ∼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 hotspot in this source is hardly reconcilable with internal crustal cooling and favours the untwisting bundle model for this outburst. Moreover, we also show how the emission from a single uniform hotspot is incompatible with the observed pulsed fraction evolution for any pair of viewing angles, suggesting an anisotropic emission pattern.

Abstract Copyright: © 2017 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society

Journal keyword(s): methods: data analysis - methods: observational - stars: magnetars - Galaxy: centre - X-rays: individual: SGR J1745-2900 - X-rays: individual: SGR J1745-2900

Simbad objects: 14

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2021.06.13-23:41:43

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