Journal Article

On the cooling trend of SGR 0526−66

Tolga Güver, Ersin Göğüş and Feryal Özel

in Monthly Notices of the Royal Astronomical Society

Published on behalf of The Royal Astronomical Society

Volume 424, issue 1, pages 210-216
Published in print July 2012 | ISSN: 0035-8711
Published online July 2012 | e-ISSN: 1365-2966 | DOI:
On the cooling trend of SGR 0526−66

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We present a systematic analysis of all archival Chandra observations of the soft gamma repeater SGR 0526−66. Our results show that the X-ray flux of SGR 0526−66 decayed by about 20 per cent between 2000 and 2009. We employ physically motivated X-ray spectral models and determine the effective temperature and the strength of the magnetic field at the surface as kT= 0.354+0.031−0.024 keV and G, respectively. We find that the effective temperature remains constant within the statistical uncertainties and attribute the decrease in the source flux to a decrease in the emitting radius. We also perform timing analysis to measure the evolution of the spin period and the period derivative over the 9-year interval. We find a period derivative of s s−1, which allows us to infer the dipole magnetic field strength and compare it with the one determined spectroscopically. Finally, we compare the effective temperature of SGR 0526−66 with the expected cooling trends from magnetized neutron stars and suggest an initial magnetic field strength of 1015–1016 G for the source.

Keywords: stars: magnetars; X-rays: individual: SGR 0526-66

Journal Article.  4288 words.  Illustrated.

Subjects: Astronomy and Astrophysics

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