NuSTAR Observations of the Unidentified INTEGRAL Sources: Constraints on the Galactic Population of HMXBs

Clavel, M.; Tomsick, John A.; Hare, Jeremy; Krivonos, R.; Mori, Kaya; Stern, Daniel

doi:10.3847/1538-4357/ab4b55

Cited by 13 publications

(7 citation statements)

References 68 publications

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“…It appears to be variable both in radio [119] and in X-rays [120]. Recently, using a Keck/LRIS spectrum, Clavel et al [121] classified this source as a highly absorbed BL Lac object on the basis of a red and featureless continuum; the optical extinction is consistent with the high column density found in X-rays, which can be ascribed to both Galactic and intrinsic absorption.…”

Section: Soft γ-Ray To Tev Radiation In Integral Agnmentioning

confidence: 89%

INTEGRAL View of TeV Sources: A Legacy for the CTA Project

et al. 2021

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Investigations that were carried out over the last two decades with novel and more sensitive instrumentation have dramatically improved our knowledge of the more violent physical processes taking place in galactic and extra-galactic Black-Holes, Neutron Stars, Supernova Remnants/Pulsar Wind Nebulae, and other regions of the Universe where relativistic acceleration processes are in place. In particular, simultaneous and/or combined observations with γ-ray satellites and ground based high-energy telescopes, have clarified the scenario of the mechanisms responsible for high energy photon emission by leptonic and hadronic accelerated particles in the presence of magnetic fields. Specifically, the European Space Agency INTEGRAL soft γ-ray observatory has detected more than 1000 sources in the soft γ-ray band, providing accurate positions, light curves and time resolved spectral data for them. Space observations with Fermi-LAT and observations that were carried out from the ground with H.E.S.S., MAGIC, VERITAS,and other telescopes sensitive in the GeV-TeV domain have, at the same time, provided evidence that a substantial fraction of the cosmic sources detected are emitting in the keV to TeV band via Synchrotron-Inverse Compton processes, in particular from stellar galactic BH systems as well as from distant black holes. In this work, employing a spatial cross correlation technique, we compare the INTEGRAL/IBIS and TeV all-sky data in search of secure or likely associations. Although this analysis is based on a subset of the INTEGRAL all-sky observations (1000 orbits), we find that there is a significant correlation: 39 objects (∼20% of the VHE γ-ray catalogue) show emission in both soft γ-ray and TeV wavebands. The full INTEGRAL database, now comprising almost 19 years of public data available, will represent an important legacy that will be useful for the Cherenkov Telescope Array (CTA) and other ground based large projects.

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Section: Soft γ-Ray To Tev Radiation In Integral Agnmentioning

confidence: 89%

INTEGRAL View of TeV Sources: A Legacy for the CTA Project

et al. 2021

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“…It appears to be variable both in radio [120] and in X-rays [121]. Recently, using a Keck/LRIS spectrum, Clavel et al [122] classified this source as a highly absorbed BL Lac object on the basis of a red and featureless continuum; the optical extinction is consistent with the high column density found in X-rays, which can be ascribed to both Galactic and intrinsic absorption.…”

Section: Soft γ-Ray To Tev Radiation In Integral Agnmentioning

confidence: 89%

INTEGRAL View of TeV Sources: A Legacy for the CTA Project

Malizia¹,

Fiocchi²,

Natalucci³

et al. 2021

Preprint

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“…Appendix B: IGR J17315−3221 IGR J17315−3221 was reported for the first time in the catalogue of the INTEGRAL sources published by Krivonos et al (2012) and suspected to be another HMXB discovered by IN-TEGRAL, possibly an SgXB (see also Clavel et al 2019). The source is reported in the catalogue at a best determined position of RA=262.818, DEC=-32.306, with an associated positional accuracy of 2 arcmin.…”

Section: Discussionmentioning

confidence: 99%

XMM-Newton and Swift observations of supergiant high mass X-ray binaries

Ferrigno,

Bozzo,

Romano

2022

Preprint

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Wind-fed supergiant X-ray binaries are precious laboratories not only to study accretion under extreme gravity and magnetic field conditions, but also to probe still highly debated properties of massive star winds. These includes the so-called clumps, originated from the inherent instability of line driven winds, and larger structures. In this paper, we report on the results of the last (and not yet published) monitoring campaigns that our group has been carrying out since 2007 with both XMM-Newton and the Swift Neil Gehrels observatory. Data collected with the EPIC cameras on-board XMM-Newton allow us to carry out a detailed hardness ratioresolved spectral analysis that can be used as an efficient way to detect spectral variations associated to the presence of clumps. Long-term observations with the XRT on-board Swift, evenly sampling the X-ray emission of supergiant X-ray binaries over many different orbital cycles, are exploited to look for the presence of large scale structures in the medium surrounding the compact objects. These can be associated either to corotating interaction regions or to accretion/photoionization wakes, as well as tidal streams. The results reported in this paper represent the outcomes of the concluded observational campaigns we carried out on the supergiant X-ray binaries 4U 1907+09, IGR J16393−4643, IGR J19140+0951, and XTE J1855−026, as well as the supergiant fast X-ray transients IGR J17503−2636, IGR J18410−0535, and IGR J11215−5952. All results are discussed in the context of wind-fed supergiant X-ray binaries and shall ideally serve to optimally shape the next observational campaigns aimed at sources in the same classes. We show in one of the paper appendices that IGR J17315−3221, preliminary classified in the literature as a possible supergiant X-ray binary discovered by INTEGRAL, is the product of a data analysis artifact and should thus be disregarded for future studies.

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NuSTAR Observations of the Unidentified INTEGRAL Sources: Constraints on the Galactic Population of HMXBs

Cited by 13 publications

References 68 publications

INTEGRAL View of TeV Sources: A Legacy for the CTA Project

INTEGRAL View of TeV Sources: A Legacy for the CTA Project

INTEGRAL View of TeV Sources: A Legacy for the CTA Project

XMM-Newton and Swift observations of supergiant high mass X-ray binaries

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