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http://hdl.handle.net/2289/6130| Title: | A Suzaku view of IGR J16393-4643 |
| Authors: | Islam, Nazma Maitra, Chandreyee Pradhan, Pragati Paul, Biswajit |
| Keywords: | Neutron stars X-ray binaries X-ray:stars |
| 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. |
| URI: | http://hdl.handle.net/2289/6130 |
| ISSN: | 0035-8711 1365-2966 - (online) |
| Alternative Location: | http://adsabs.harvard.edu/abs/2015MNRAS.446.4148I http://arxiv.org/abs/1411.3108 http://dx.doi.org/10.1093/mnras/stu2395 |
| Copyright: | 2015 The authors & the Royal Astronomical Society |
| Appears in Collections: | Research Papers (A&A) |
Files in This Item:
| File | Description | Size | Format | |
|---|---|---|---|---|
| 2015_MNRAS_446_4148.pdf | Open Access | 758.58 kB | Adobe PDF | View/Open |
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