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The Peculiar X-ray Transient IGR 16358-4726

S. K. Patel·C. Kouveliotou·A. Tennant·P. M. Woods·A. King·P. Ubertini·C. Winkler·T. J. -L. Courvoisier·M. van der Klis·S. Wachter·B. M. Gaensler·C. J. Phillips
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Abstract

The new transient IGR 16358-4726 was discovered on 2003 March 19 with INTEGRAL. We detected the source serendipitously during our 2003 March 24 observation of SGR 1627-41 with the Chandra X-ray Observatory at the 1.7 x 10^{-10} ergs s^{-1} cm^{-2} flux level (2-10 keV) with a very high absorption column (N_H=3.3(1) x 10^{23} cm^{-2}) and a hard power law spectrum of index 0.5(1). We discovered a very strong flux modulation with a period of 5880(50) s and peak-to-peak pulse fraction of 70(6)% (2-10 keV), clearly visible in the x-ray data. The nature of IGR 16358-4726 remains unresolved. The only neutron star systems known with similar spin periods are low luminosity persistent wind-fed pulsars; if this is a spin period, this transient is a new kind of object. If this is an orbital period, then the system could be a compact Low Mass X-ray Binary (LMXB).

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S. K. Patel, C. Kouveliotou, A. Tennant, P. M. Woods, A. King, P. Ubertini, C. Winkler, T. J. -L. Courvoisier, M. van der Klis, S. Wachter, B. M. Gaensler, C. J. Phillips. 2003-07-30. The Peculiar X-ray Transient IGR 16358-4726. https://doi.org/10.1086/382210

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