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Unraveling the cooling trend of the Soft Gamma Repeater, SGR 1627-41

C. Kouveliotou·D. Eichler·P. M. Woods·Y. Lyubarsky·S. K. Patel·E. Gogus·M. van der Klis·A. Tennant·S. Wachter·K. Hurley
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Abstract

SGR 1627-41 was discovered in 1998 after a single active episode which lasted \~6 weeks. We report here our monitoring results of the decay trend of the persistent X-ray luminosity of the source during the last 5 years. We find an initial temporal power law decay with index 0.47, reaching a plateau which is followed by a sharp (factor of ten) flux decline ~800 days after the source activation. The source spectrum is best described during the entire period by a single power law with high absorption (N_H=9.0(7)x10^(22) cm^(-2)); the spectral index, however, varies dramatically between 2.2-3.8 spanning the entire range for all known SGR sources. We discuss the cooling behavior of the neutron star assuming a deep crustal heating initiated by the burst activity of the source during 1998.

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C. Kouveliotou, D. Eichler, P. M. Woods, Y. Lyubarsky, S. K. Patel, E. Gogus, M. van der Klis, A. Tennant, S. Wachter, K. Hurley. 2003-10-27. Unraveling the cooling trend of the Soft Gamma Repeater, SGR 1627-41. https://doi.org/10.1086/379187

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