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Title: A Suzaku view of IGR J16393-4643
Authors: Islam, Nazma
Maitra, Chandreyee
Pradhan, Pragati
Paul, Biswajit
Keywords: Neutron stars
X-ray binaries
Issue Date: 4-Feb-2015
Publisher: Oxford University Press for The Royal Astronomical Society
Citation: Monthly Notices of the Royal Astronomical Society, 2015, Vol. 446, p4148-4154
Abstract: The pulsar IGR J16393–4643 belongs to a class of highly absorbed supergiant high-mass X-ray binaries (HMXBs), characterized by a very high column density of absorbing matter. We present the results of simultaneous broad-band pulsation and spectrum analysis from a 44-ks Suzaku observation of the source. The orbital intensity profile created with the Swift Burst Alert Telescope (Swift–BAT) light curve shows an indication of IGR J16393–4643 being an eclipsing system with a short eclipse semi-angle θE ∼ 17°. For a supergiant companion star with a 20-R⊙ radius, this implies an inclination of the orbital plane in the range 39°–57°, whereas for a main-sequence B star as the companion with a 10-R⊙ radius, the inclination of the orbital plane is in the range 60°–77°. Pulse profiles created for different energy bands have complex morphology, which shows some energy dependence and increases in pulse fraction with energy. We have also investigated broad-band spectral characteristics, phase-averaged spectra and resolving the pulse phase into peak and trough phases. The phase-averaged spectrum has a very high NH(∼ 3 × 1023 cm−2) and is described by a power law (Γ ∼ 0.9) with a high-energy cut-off above 20 keV. We find a change in the spectral index in the peak and trough phases, implying an underlying change in the source spectrum.
Description: Open Access.
ISSN: 0035-8711
1365-2966 - (online)
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Copyright: 2015 The authors & the Royal Astronomical Society
Appears in Collections:Research Papers (A&A)

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