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Prospecting the wind structure of IGR J16320–4751 with XMM-Newton and Swift

Published online by Cambridge University Press:  30 December 2019

F. García Open the ORCID record for F. García [Opens in a new window] ,
F. A. Fogantini ,
S. Chaty  and
J. A. Combi
F. García
Affiliation:
AIM, CEA, CNRS, Université Paris-Saclay, Université Paris Diderot, Sorbonne Paris Cité, F-91191 Gif-sur-Yvette, France email: federico.garcia@cea.fr
F. A. Fogantini
Affiliation:
Instituto Argentino de Radioastronomía (CONICET; CICPBA) & Facultad de Ciencias Astronómicas y Geofísicas, Universidad Nacional de La Plata, Argentina
S. Chaty
Affiliation:
AIM, CEA, CNRS, Université Paris-Saclay, Université Paris Diderot, Sorbonne Paris Cité, F-91191 Gif-sur-Yvette, France email: federico.garcia@cea.fr
J. A. Combi
Affiliation:
Instituto Argentino de Radioastronomía (CONICET; CICPBA) & Facultad de Ciencias Astronómicas y Geofísicas, Universidad Nacional de La Plata, Argentina
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Abstract

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. The INTEGRAL satellite has revealed a previously hidden population of absorbed High Mass X-ray Binaries (HMXBs) hosting supergiant (SG) stars. Among them, IGR J16320–4751 is a classical system intrinsically obscured by its environment, with a column density of ~1023 cm-2, more than an order of magnitude higher than the interstellar absorption along the line of sight. It is composed of a neutron star (NS) rotating with a spin period of ~1300 s, accreting matter from the stellar wind of an O8I SG, with an orbital period of ~9 days. We analyzed all existing archival XMM- Newton and Swift/BAT observations of the obscured HMXB IGR J16320–4751 performing a detailed temporal and spectral analysis of the source along its orbit. Using a typical model for the supergiant wind profile, we simultaneously fitted the evolution of the hard X-ray emission and intrinsic column density along the full orbit of the NS around the SG, which allowed us to constrain physical and geometrical parameters of the binary system.

Keywords

X-ray: individual objects (IGR J16320–4751)stars: supergiantsstars: neutronX-ray: binaries
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 14 , Symposium S346: High-mass X-ray Binaries: Illuminating the Passage from Massive Binaries to Merging Compact Objects , August 2018 , pp. 212 - 215
Copyright
© International Astronomical Union 2019 

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