On the cooling trend of SGR 0526-66

Tolga Güver, Ersin Göǧüş, Feryal Özel

Research output: Contribution to journalArticle

5 Scopus citations

Abstract

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 20per 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 -0.024keV 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 ss -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 10 15-10 16G for the source.

Original languageEnglish (US)
Pages (from-to)210-216
Number of pages7
JournalMonthly Notices of the Royal Astronomical Society
Volume424
Issue number1
DOIs
StatePublished - Jul 1 2012

Keywords

  • Stars: magnetars
  • X-rays: individual: SGR 0526-66

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

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