2012MNRAS.424..210G -
Mon. Not. R. Astron. Soc., 424, 210-216 (2012/July-3)
On the cooling trend of Sgr 0526-66.
GUVER T., GOGUS E. and OZEL F.
Abstract (from CDS):
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 B = (3.73–0.08+0.16)x104 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 {dot}P = (4.0± 0.5)x10–11s/s s/s, 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.
Abstract Copyright:
2012 The Authors Monthly Notices of the Royal Astronomical Society2012 RAS
Journal keyword(s):
stars: magnetars - X-rays: individual: SGR 0526-66
Simbad objects:
3
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