INTEGRAL and XMM-Newton observations of the X-ray pulsar IGR J16320-4751/AX J1631.9-4752

Abstract

We report on observations of the X-ray pulsar IGR J16320-4751 (a.k.a. AX J1631.9-4752) performed simultaneously with INTEGRAL and XMM-Newton. We refine the source position and identify the most likely infrared counterpart. Our simultaneous coverage allows us to confirm the presence of X-ray pulsations at ~1300 s, that we detect above 20 keV with INTEGRAL for the first time. The pulse fraction is consistent with being constant with energy, which is compatible with a model of polar accretion by a pulsar. We study the spectral properties of IGR J16320-4751 during two major periods occurring during the simultaneous coverage with both satellites, namely a flare and a non-flare period. We detect the presence of a narrow 6.4 keV iron line in both periods. The presence of such a feature is typical of supergiant wind accretors such as Vela X-1 or GX 301-2. We inspect the spectral variations with respect to the pulse phase during the non-flare period, and show that the pulse is solely due to variations of the X-ray flux emitted by the source and not to variations of the spectral parameters. Our results are therefore compatible with the source being a pulsar in a High Mass X-ray Binary. We detect a soft excess appearing in the spectra as a blackbody with a temperature of ~0.07 keV. We discuss the origin of the X-ray emission in IGR J16320-4751: while the hard X-rays are likely the result of Compton emission produced in the close vicinity of the pulsar, based on energy argument we suggest that the soft excess is likely the emission by a collisionally energised cloud in which the compact object is embedded.

arXiv commentAccepted for publication in MNRAS, 10 pages, 8 figures

References in corpus (14)

• The European Photon Imaging Camera on XMM-Newton: The MOS Cameras
• ISGRI: the INTEGRAL Soft Gamma-Ray Imager
• Observations of Accreting Pulsars
• The INTEGRAL Science Data Centre (ISDC)
• Photoionization Modeling and the K Lines of Iron
• Faint X-ray sources resolved in the ASCA Galactic plane survey and their contribution to the Galactic ridge X-ray emission
• The INTEGRAL/IBIS Scientific Data Analysis
• Origin of the Soft Excess in X-ray Pulsars
• INTEGRAL discovery of a bright highly obscured galactic X-ray binary source IGR J16318-4848
• X-Ray Observations of the Black Hole Transient 4U 1630-47 During Two Years of X-Ray Activity
• Chandra Grating Spectroscopy of the X-ray Binary 4U 1700-37 in a Flaring State
• An XMM Observation of IGR J16320-4751=AX J1631.9-4752
• Discovery of X-ray pulsations from IGR J16320-4751 = AX J1631.9-4752
• Unveiling the Nature of the High Energy Source IGR J19140+0951

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