proposed, on the basis of their orbital parameters, that IGR J16393-4643 is a supergiant wind-accretion powered HMXB. (2006, Ap J 649, 373) to have a 3.6875 Â☐.0006 day orbital period from a pulse timing analysis, although other solutions with orbital periods of 50.2 and 8.1 days could not be excluded. The 910s X-ray pulsar IGR J16393-4643 was reported by Thompson et al. Spectral timing analysis allows derivation of the wind properties of the massive star.Ī 4.2 Day Period in the X-ray Pulsar IGR J16393-4643 from Swift/BAT and RXTE/PCA ObservationsĬorbet, R. A refined orbital solution can be derived. IGR J17252-3616 shows a varying column density NH and Fe Kα line when fit with simple phenomenological models. Observations were scheduled in order to cover the orbital-phase space as much as possible. IGR J17252-3616, a highly absorbed High Mass X-ray Binary ( HMXB) with Hydrogen column density NH~(2-4)Ã-1023 cm-2, has been observed with XMM-Newton for about one month. We present the spectral and timing properties of our first target, IGR J18214-1318. The absence of such features would make an HMXB an excellent black hole candidate. ![]() Therefore, we are trying to identify the nature of the compact objects in the IGR HMXBs by using NuSTAR and XMM-Newton to search for NS signatures in these systems: pulsations, cyclotron absorption lines, and exponential cutoffs with e-folding energies below ~20 keV. Cyg X-1), it is possible that some of the supergiant HMXBs discovered by INTEGRAL may host BHs. However, since luminous supergiant BH HMXBs are known to exist (i.e. Some population synthesis studies have shown that BHs are likely to be rare among the Be HMXB population (Belczynki & Ziolkowski, 2009, Ap J, 707, 870) and the one BH Be HMXB that has been discovered has very low X-ray luminosity (Casares et al., 2014, Nature, 505, 378), indicating that BH Be HMXBs may exist but remain undetected by current surveys. ![]() Measuring the fraction of high-mass X-ray binaries (HMXBs) that harbors a black hole (BH) rather than a neutron star (NS) can improve our understanding of the role of stellar winds and mass transfer in the evolution of massive stars and help constrain estimates of the numbers of NS/BH and BH/BH binaries in the Galaxy, potential sources of gravitational waves that could be detected by Advanced-LIGO. ![]() Does the HMXB IGR J18214-1318 contain a black hole or neutron star?įornasini, Francesca Tomsick, John Bachetti, Matteo Fuerst, Felix Natalucci, Lorenzo Pottschmidt, Katja Smith, David M.
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