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Suzaku Captures a Possible Eclipse in IGR J16207-5129 and Identifies a Weak-Flaring State in IGR J17391-3021We present the results from analyses of Suzaku observations of the supergiant X-ray binaries IGR Jl6207-5129 and IGR Jl7391-3021. For IGR Jl6207-5129, we provide the first broadband (0.5-60 keV) spectrum from which we confirm a large intrinsic column density (N(sub H) = 16 X 10(exp 22)/square cm), and constrain the cutoff energy for the first time (E(sub c) 19 keV). We observed a prolonged (> 30 ks) attenuation of the X-ray flux which we tentatively attribute to an eclipse of the probable neutron star by its massive companion. For IGR Jl739J-3021, we witnessed a transition from quiescence to a low-activity phase punctuated by weak flares whose peak luminosities in the 0.5-10 keV band are only a factor of 5 times that of the pre-flare emission. The weak flaring is accompanied by an increase in the absorbing column which suggests the accretion of obscuring clumps of wind. Placing this observation in the context of the recent Swift monitoring campaign, we now recognize that these low-activity epochs constitute the most common emission phase for this system, and perhaps in other supergiant fast X-ray transients (SFXTs) as well.
Document ID
20110015275
Acquisition Source
Goddard Space Flight Center
Document Type
Conference Paper
Authors
Bodaghee, Arash (California Univ. Berkeley, CA, United States)
Tomsick, John A. (California Univ. Berkeley, CA, United States)
Rodriquez, Jerome (Saclay Research Centre Gif-sur-Yvette, France)
Chaty, Sylvain (Saclay Research Centre Gif-sur-Yvette, France)
Pottschmidt, Katja (NASA Goddard Space Flight Center Greenbelt, MD, United States)
Walter, Roland (Geneve Univ. Geneve, Switzerland)
Romano, Patrizia (Istituto di Astrofisica Spaziale e Fisica Cosmica (INAF-IASF) Rome, Italy)
Date Acquired
August 25, 2013
Publication Date
September 27, 2011
Subject Category
Astronomy
Report/Patent Number
GSFC.CP.4731.2011
Meeting Information
Meeting: 8th INTEGRAL Workshop "The Restless Gamma-ray Universe"
Location: Dublin
Country: Ireland
Start Date: September 27, 2011
End Date: September 30, 2011
Funding Number(s)
CONTRACT_GRANT: NNG06E090A
Distribution Limits
Public
Copyright
Public Use Permitted.

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