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

doi:10.1111/j.1365-2966.2011.19916.x

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

Astronomy & Astrophysics

Research output: Contribution to journal › Article › peer-review

15 Scopus citations

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 language	English (US)
Pages (from-to)	2695-2702
Number of pages	8
Journal	Monthly Notices of the Royal Astronomical Society
Volume	419
Issue number	3
DOIs	https://doi.org/10.1111/j.1365-2966.2011.19916.x
State	Published - Jan 2012

All Science Journal Classification (ASJC) codes

Astronomy and Astrophysics
Space and Planetary Science

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title = "Swift/X-ray Telescope monitoring of the candidate supergiant fast X-ray transient IGR J16418-4532",

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.",

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

year = "2012",

month = jan,

doi = "10.1111/j.1365-2966.2011.19916.x",

language = "English (US)",

volume = "419",

pages = "2695--2702",

journal = "Monthly Notices of the Royal Astronomical Society",

issn = "0035-8711",

publisher = "Oxford University Press",

number = "3",

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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, 01.2012, p. 2695-2702.

Research output: Contribution to journal › Article › peer-review

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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.

PY - 2012/1

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