Rachel A. Rampy, David M. Smith, Ignacio Negueruela
Published 2009-04-07, updated 2009-10-16Version 3
We present the first direct evidence for dense clumps of matter in the companion wind in a Supergiant Fast X-ray Transient (SFXT) binary. This is seen as a brief period of enhanced absorption during one of the bright, fast flares that distinguish these systems. The object under study was IGR J17544-2619, and a total of 236 ks of data were accumulated with the Japanese satellite Suzaku. The activity in this period spans a dynamic range of almost 10000 in luminosity and gives a detailed look at SFXT behavior.
Comments: 14 pages, 8 figures, accepted for The Astrophysical Journal. Version 3 includes minor changes made during the refereeing process: primarily an assortment of references to results appearing since the original submission, but also a new spectral fit (Figure 8)
Journal: Astrophys.J.707:243-249,2009
Detecting the intrinsic X-ray emission from the O-type donor star and the residual accretion in a Supergiant Fast X-ray Transient during its faintest state
Measuring the stellar wind parameters in IGR J17544-2619 and Vela X-1 constrains the accretion physics in Supergiant Fast X-ray Transient and classical Supergiant X-ray Binaries
XMM-Newton observations of IGRJ18410-0535: The ingestion of a clump by a supergiant fast X-ray transient
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