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Investigating High Mass X-ray Binaries at hard X-rays with INTEGRAL

Published online by Cambridge University Press:  30 December 2019

Lara Sidoli Open the ORCID record for Lara Sidoli [Opens in a new window]  and
Adamantia Paizis
Lara Sidoli
Affiliation:
INAF/IASF Milano, Istituto di Astrofisica e Fisica Cosmica di Milano via A. Corti 12, I-20133, Milano, Italy emails: lara.sidoli@inaf.it, adamantia.paizis@inaf.it
Adamantia Paizis
Affiliation:
INAF/IASF Milano, Istituto di Astrofisica e Fisica Cosmica di Milano via A. Corti 12, I-20133, Milano, Italy emails: lara.sidoli@inaf.it, adamantia.paizis@inaf.it
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Abstract

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The INTEGRAL archive developed at INAF-IASF Milano with the available public observations from late 2002 to 2016 is investigated to extract the X-ray properties of 58 High Mass X-ray Binaries (HMXBs). This sample consists of sources hosting either a Be star (Be/XRBs) or an early-type supergiant companion (SgHMXBs), including the Supergiant Fast X-ray Transients (SFXTs). INTEGRAL light curves (sampled at 2 ks) are used to build their hard X-ray luminosity distributions, returning the source duty cycles, the range of variability of the X-ray luminosity and the time spent in each luminosity state. The phenomenology observed with INTEGRAL, together with the source variability at soft X-rays taken from the literature, allows us to obtain a quantitative overview of the main sub-classes of massive binaries in accretion (Be/XRBs, SgHMXBs and SFXTs). Although some criteria can be derived to distinguish them, some SgHMXBs exist with intermediate properties, bridging together persistent SgHMXBs and SFXTs.

Keywords

X–rays: binariesaccretion

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