Swift/XRT monitoring of the candidate Supergiant Fast X-ray Transient IGR J16418-4532

Details Swift/XRT monitoring of the candidate Supergiant Fast X-ray Transient IGR J16418-4532 Swift/XRT monitoring of the candidate Supergiant Fast X-ray Transient IGR J16418-4532

2011-09-28

arxiv.org/abs/1109.6165v1

Astronomy and Astrophysics

Astrophysics

High Energy Astrophysical Phenomena

Accepted for publication in MNRAS. 8 pages, 6 figures, 3 tables

Scientific paper

10.1111/j.1365-2966.2011.19916.x

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 (~3.7d and ~1250s, respectively). Our observations, for a total of ~43ks, 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 ~5E16 g to 1E21g. Our data suggest, based on the X-ray behaviour, that this is an intermediate SFXT.

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