The supergiant fast X-ray transient IGR J18483−0311 in quiescence: XMM-Newton, Swift and Chandra observations

Giunta, A. ; Bozzo, E. ; Bernardini, F. ; Israel, G. ; Stella, L. ; Falanga, M. ; Campana, S. ; Bazzano, A. ; Dean, A. J. ; Mendez, M.

In: Monthly Notices of the Royal Astronomical Society, 2009, vol. 399, no. 2, p. 744-749

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    Summary
    IGR J18483−0311 was discovered with INTEGRAL in 2003 and later classified as a supergiant fast X-ray transient. It was observed in outburst many times, but its quiescent state is still poorly known. Here, we present the results of XMM-Newton, Swift and Chandra observations of IGR J18483−0311. These data improved the X-ray position of the source, and provided new information on the timing and spectral properties of IGR J18483−0311 in quiescence. We report the detection of pulsations in the quiescent X-ray emission of this source, and give for the first time a measurement of the spin-period derivative of this source. In IGR J18483−0311, the measured spin-period derivative of −(1.3 ± 0.3) × 10−9 s s−1 likely results from light travel time effects in the binary. We compare the most recent observational results of IGR J18483−0311 and SAX J1818.6−1703, the two supergiant fast X-ray transients for which a similar orbital period has been measured