The Be X-ray Binary Outburst Zoo II

Kühnel, Matthias; Kretschmar, P.; Okazaki, Atsuo T.; Schönherr, G.; Wilson-Hodge, C.; Falkner, Sebastian; Brand, Thorsten; Anders, F.; Schwarm, Fritz-Walter; Kreykenbohm, I.; Müller, Sebastian; Pottschmidt, K.; Fürst, Felix; Grinberg, V.; Wilms, J.

doi:10.22323/1.228.0078

Cited by 3 publications

(1 citation statement)

References 16 publications

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“…To highlight such variability, we fitted the outbursts with an asymmetric Gaussian function and a constant (red lines in top panels of Fig. 3; see Kühnel et al 2015, for details about the asymmetric Gaussian model). Then, we subtracted the fitting functions from the outburst profiles and we plotted the resulting detrended lightcurves (bottom panels of Fig.…”

Section: Outburst Profilesmentioning

confidence: 99%

Two giant outbursts of V0332+53 observed with INTEGRAL

Ferrigno

Ducci

Bozzo

et al. 2016

A&A

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Context. In July 2015, the high-mass X-ray binary V0332+53 underwent a giant outburst, a decade after the previous one. V0332+53 hosts a strongly magnetized neutron star. During the 2004-2005 outburst, an anti-correlation between the centroid energy of its fundamental cyclotron resonance scattering features (CRSFs) and the X-ray luminosity was observed. Aims. The long (≈100 d) and bright (L x ≈ 10 38 erg s −1 ) 2015 outburst provided the opportunity to study the unique properties of the fundamental CRSF during another outburst and to study its dependence on the X-ray luminosity. Methods. The source was observed by the INTEGRAL satellite for ∼330 ks. We exploit the spectral resolution at high energies of the SPectrometer on INTEGRAL (SPI) and the Joint European X-ray Monitors to characterize its spectral properties, focusing in particular on the CRSF-luminosity dependence. We complement the data of the 2015 outburst with those collected by SPI in [2004][2005], which have so far been left unpublished. Results. We find a highly significant anti-correlation of the centroid energy of the fundamental CRSF and the 3-100 keV luminosity of E 1 ∝ −0.095(8)L 37 keV. This trend is observed for both outbursts. We confirm the correlation between the width of the fundamental CRSF and the X-ray luminosity previously found in the JEM-X and IBIS dataset of the 2004-2005 outburst. By exploiting the RXTE/ASM and Swift/BAT monitoring data, we also report on the detection of a ∼34 d modulation superimposed on the mean profiles and roughly consistent with the orbital period of the pulsar. We discuss possible interpretations of such variability.

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Section: Outburst Profilesmentioning

confidence: 99%

Two giant outbursts of V0332+53 observed with INTEGRAL

Ferrigno

Ducci

Bozzo

et al. 2016

A&A

Self Cite

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

Sidoli¹,

Paizis²

2018

Proc. IAU

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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.

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An INTEGRAL overview of High-Mass X–ray Binaries: classes or transitions?

Sidoli

Paizis

2018

Monthly Notices of the Royal Astronomical Society

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We analyzed in a systematic way the public INTEGRAL observations spanning from December 2002 to September 2016, to investigate the hard X-ray properties of about 60 High Mass X-ray Binaries (HMXBs). We considered both persistent and transient sources, hosting either a Be star (Be/XRBs) or a blue supergiant companion (SgHMXBs, including Supergiant Fast X-ray Transients, SFXTs), a neutron star or a black hole. INTEGRAL X-ray light curves (18-50 keV), sampled at a bin time of about 2 ks, were extracted for all HMXBs to derive the cumulative distribution of their hard X-ray luminosity, their duty cycle, the range of variability of their hard X-ray luminosity. This allowed us to obtain an overall and quantitative characterization of the long-term hard X-ray activity of the HMXBs in our sample. Putting the phenomenology observed with INTEGRAL into context with other known source properties (e.g. orbital parameters, pulsar spin periods) together with observational constraints coming from softer X-rays (1-10 keV), enabled the investigation of the way the different HMXB subclasses behave (and sometimes overlap). For given source properties, the different sub-classes of massive binaries seem to cluster in a suggestive way. However, for what concerns supergiant systems (SgHMXBs versus SFXTs), several sources with intermediate properties exist, suggesting a smooth transition between the two sub-classes.

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The Be X-ray Binary Outburst Zoo II

Cited by 3 publications

References 16 publications

Two giant outbursts of V0332+53 observed with INTEGRAL

Two giant outbursts of V0332+53 observed with INTEGRAL

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

An INTEGRAL overview of High-Mass X–ray Binaries: classes or transitions?

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