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EDP Sciences, Astronomy & Astrophysics, (539), p. A21, 2012

DOI: 10.1051/0004-6361/201117947

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X-ray Pulsations from the region of the Supergiant Fast X-ray Transient IGR J17544-2619

Journal article published in 2012 by S. P. Drave, A. J. Bird, L. J. Townsend, A. B. Hill ORCID, V. A. McBride, V. Sguera ORCID, A. Bazzano, D. J. Clark
This paper is made freely available by the publisher.
This paper is made freely available by the publisher.

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Abstract

Phase-targeted RXTE observations have allowed us to detect a transient 71.49 ± 0.02 s signal that is most likely to be originating from the supergiant fast X-ray transient IGR J17544-2619. The phase-folded light curve shows a possible double-peaked structure with a pulsed flux of ~4.8*10^-12 erg cm^-2 s^-1 (3-10 keV). Assuming the signal to indicate the spin period of the neutron star in the system, the provisional location of IGR J17544-2619 on the Corbet diagram places the system within the classical wind-fed supergiant XRB region. Such a result illustrates the growing trend of supergiant fast X-ray transients to span across both of the original classes of HMXB in Porb - Pspin space. ; Comment: 7 pages, 6 figures, Accepted for publication in Astronomy and Astrophysics main journal