Peering through the stellar wind of IGR J19140+0951 with simultaneous INTEGRAL/RXTE observations

Abstract

We have used the RXTE and INTEGRAL satellites simultaneously to observe the High Mass X-ray binary IGR J19140+0951. The spectra obtained in the 3--80 keV range have allowed us to perform a precise spectral analysis of the system along its binary orbit. The spectral evolution confirms the supergiant nature of the companion star and the neutron star nature of the compact object. Using a simple stellar wind model to describe the evolution of the photoelectric absorption, we were able to restrict the orbital inclination angle in the range 38--75 degrees. This analysis leads to a wind mass-loss rate from the companion star of ~5x 10e-8 Msun/year, consistent with an OB I spectral type. We have detected a soft excess in at least four observations, for the first time for this source. Such soft excesses have been reported in several HMXBs in the past. We discuss the possible origin of this excess, and suggest, based on its spectral properties and occurrences around the superior conjunction, that it may be explained as the reprocessing of the X-ray emission originating from the neutron star by the surrounding ionised gas.

11 pages, 7 figures, accepted in MNRAS

References in corpus (14)

• ISGRI: the INTEGRAL Soft Gamma-Ray Imager
• Calibration of the Rossi X-ray Timing Explorer Proportional Counter Array
• Catalogue of high-mass X-ray binaries in the Galaxy ($4^{th}$ edition)
• Origin of the Soft Excess in X-ray Pulsars
• RXTE Measurement of the Diffuse X-ray Emission From the Galactic Ridge: Implications for the Energetics of the Interstellar Medium
• A Systematic Search for Periodicities in RXTE/ASM Data
• A description of sources detected by INTEGRAL during the first 4 years of observations
• A two-dimensional electrodynamical outer gap model for gamma-ray pulsars: Gamma-ray spectrum
• X1908+075: A Pulsar Orbiting in the Stellar Wind of a Massive Companion
• INTEGRAL and XMM-Newton observations of the X-ray pulsar IGR J16320-4751/AX J1631.9-4752
• Unveiling the Nature of the High Energy Source IGR J19140+0951
• The nature of the infrared counterpart of IGR J19140+0951
• Discovery of a new INTEGRAL source: IGR J19140+0951
• Optical identification of IGR J19140+0951

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