Swift/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, N. Gehrels

Research output: Contribution to journalArticle

14 Citations (Scopus)

Abstract

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 ~5 × 10 16 to 10 21g. Our data suggest, based on the X-ray behaviour, that this is an intermediate SFXT.

Original languageEnglish (US)
Pages (from-to)2695-2702
Number of pages8
JournalMonthly Notices of the Royal Astronomical Society
Volume419
Issue number3
DOIs
StatePublished - Jan 1 2012

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telescopes
monitoring
x rays
light curve
orbitals
circular orbits
clumps
sampling
accretion

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science

Cite this

Romano, P. ; Mangano, V. ; Ducci, L. ; Esposito, P. ; Evans, P. A. ; Vercellone, S. ; Kennea, J. A. ; Burrows, D. N. ; Gehrels, N. / Swift/X-ray Telescope monitoring of the candidate supergiant fast X-ray transient IGR J16418-4532. In: Monthly Notices of the Royal Astronomical Society. 2012 ; Vol. 419, No. 3. pp. 2695-2702.
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Swift/X-ray Telescope monitoring of the candidate supergiant fast X-ray transient IGR J16418-4532. / Romano, P.; Mangano, V.; Ducci, L.; Esposito, P.; Evans, P. A.; Vercellone, S.; Kennea, J. A.; Burrows, D. N.; Gehrels, N.

In: Monthly Notices of the Royal Astronomical Society, Vol. 419, No. 3, 01.01.2012, p. 2695-2702.

Research output: Contribution to journalArticle

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AU - Romano, P.

AU - Mangano, V.

AU - Ducci, L.

AU - Esposito, P.

AU - Evans, P. A.

AU - Vercellone, S.

AU - Kennea, J. A.

AU - Burrows, D. N.

AU - Gehrels, N.

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