Journal Article

<i>Swift</i>/X-ray Telescope monitoring of the candidate supergiant fast X-ray transient IGR J16418−4532

P. Romano, V. Mangano, L. Ducci, P. Esposito, P. A. Evans, S. Vercellone, J. A. Kennea, D. N. Burrows and N. Gehrels

in Monthly Notices of the Royal Astronomical Society

Published on behalf of The Royal Astronomical Society

Volume 419, issue 3, pages 2695-2702
Published in print January 2012 | ISSN: 0035-8711
Published online January 2012 | e-ISSN: 1365-2966 | DOI: http://dx.doi.org/10.1111/j.1365-2966.2011.19916.x
Swift/X-ray Telescope monitoring of the candidate supergiant fast X-ray transient IGR J16418−4532

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We report on the Swift monitoring of the candidate supergiant fast X-ray transient (SFXT) IGR J16418−4532, for which both orbital and spin periods are known (∼3.7 d and ∼1250 s, respectively). Our observations, for a total of ∼43 ks, span over three orbital periods and represent the most intense and complete sampling of the light curve of this source with a sensitive X-ray instrument. With this unique set of observations, we can address the nature of this transient. By applying the clumpy wind model for blue supergiants to the observed X-ray light curve, and assuming a circular orbit, the X-ray emission from this source can be explained in terms of the accretion from a spherically symmetric clumpy wind, composed of clumps with different masses, ranging from ∼5 × 1016 to 1021 g. Our data suggest, based on the X-ray behaviour, that this is an intermediate SFXT.

Keywords: X-rays: binaries; X-rays: individual: IGR J16418−4532

Journal Article.  5123 words.  Illustrated.

Subjects: Astronomy and Astrophysics

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