ISGRI: The INTEGRAL Soft Gamma-Ray Imager

Lebrun, F.; Leray, J. P.; Lavocat, P.; Cretolle, J.; Arques, M.; Blondel, C.; Bonnin, C.; Bouere, A.; Cara, C.; Chaleil, T.; Daly, F.; Desages, F.; Dzitko, H.; Horeau, B.; Laurent, Philippe; Limousin, O.; Mathy, F.; Mauguen, V.; Meignier, F.; Molinié, F.; Poindron, E.; Rouger, M.; Sauvageon, A.; Tourrette, Thierry

doi:10.1051/0004-6361:20031367

Cited by 759 publications

(637 citation statements)

References 15 publications

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“…different pointings lasting each ∼ 2 − 3 ks. We analyzed data from the IBIS/ISGRI (Ubertini et al 2003;Lebrun et al 2003), covering the energy range 20-300 keV energy band, and from the two JEM-X monitors (Lund et al 2003), operating in the range 3-20 keV. As the source position varied with respect to the aim point of the satellite during the observational period ranging from 2015 March 12 at 19:07 (satellite revolution 1517) to 2015 April 28 at 11:40 UTC (satellite revolution 1535), the coverage provided by IBIS/ISGRI was generally much larger than that of the two JEM-X monitors due to their smaller field of view.…”

Section: Integralmentioning

confidence: 99%

XMM-Newtonand INTEGRAL view of the hard state of EXO 1745−248 during its 2015 outburst

Matranga

Papitto

Salvo

et al. 2017

A&A

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Context. Transient low-mass X-ray binaries (LMXBs) often show outbursts lasting typically a few-weeks and characterized by a high X-ray luminosity (L x ≈ 10 36 − 10 38 erg s −1 ), while for most of the time they are found in X-ray quiescence (L X ≈ 10 31 − 10 33 erg s −1 ). EXO 1745-248 is one of them. Aims. The broad-band coverage, and the sensitivity of instrumet on board of XMM-Newton and INTEGRAL, offers the opportunity to characterize the hard X-ray spectrum during EXO 1745-248 outburst. Methods. In this paper we report on quasi-simultaneous XMM-Newton and INTEGRAL observations of the X-ray transient EXO 1745-248 located in the globular cluster Terzan 5, performed ten days after the beginning of the outburst (on 2015 March 16th) shown by the source between March and June 2015. The source was caught in a hard state, emitting a 0.8-100 keV luminosity of ≃ 10 37 erg s −1 . Results. The spectral continuum was dominated by thermal Comptonization of seed photons with temperature kT in ≃ 1.3 keV, by a cloud with moderate optical depth τ ≃ 2 and electron temperature kT e ≃ 40 keV. A weaker soft thermal component at temperature kT th ≃ 0.6-0.7 keV and compatible with a fraction of the neutron star radius was also detected. A rich emission line spectrum was observed by the EPIC-pn on-board XMM-Newton; features at energies compatible with K-α transitions of ionized sulfur, argon, calcium and iron were detected, with a broadness compatible with either thermal Compton broadening or Doppler broadening in the inner parts of an accretion disk truncated at 20 ± 6 gravitational radii from the neutron star. Strikingly, at least one narrow emission line ascribed to neutral or mildly ionized iron is needed to model the prominent emission complex detected between 5.5 and 7.5 keV. The different ionization state and broadness suggest an origin in a region located farther from the neutron star than where the other emission lines are produced. Seven consecutive type-I bursts were detected during the XMM-Newton observation, none of which showed hints of photospheric radius expansion. A thorough search for coherent pulsations from the EPIC-pn light curve did not result in any significant detection. Upper limits ranging from a few to 15% on the signal amplitude were set, depending on the unknown spin and orbital parameters of the system.

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Section: Integralmentioning

confidence: 99%

XMM-Newtonand INTEGRAL view of the hard state of EXO 1745−248 during its 2015 outburst

Matranga

Papitto

Salvo

et al. 2017

A&A

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“…For the study of AXPs the low-energy detector of IBIS, called IS-GRI (20-300 keV, Lebrun et al 2003), has proven itself to be of great importance. The serendipitous discovery of AXPs in the INTEGRAL energy band was a result of the combination of long exposure times and the 29 • wide FOV of IBIS.…”

Section: Hard X-rays: Integralmentioning

confidence: 99%

The first multi-wavelength campaign of AXP 4U 0142+61 from radio to hard X-rays

Hartog

Kuiper

Hermsen

et al. 2007

Astrophys Space Sci

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For the first time a quasi-simultaneous multiwavelength campaign has been performed on an Anomalous X-ray Pulsar from the radio to the hard X-ray band. 4U 0142+61 was an INTEGRAL target for 1 Ms in July 2005. During these observations it was also observed in the X-ray band with Swift and RXTE, in the optical and NIR with Gemini North and in the radio with the WSRT. In this paper we present the source-energy distribution. The spectral results obtained in the individual wave bands do not connect smoothly; apparently components of different origin contribute to the total spectrum. Remarkable is that the INTEGRAL hard X-ray spectrum (power-law index 0.79 ± 0.10) is now measured up to an energy of ∼230 keV with no indication of a spectral break. Extrapolation of the INTEGRAL power-law spectrum to lower energies passes orders of magnitude underneath the NIR and optical fluxes,

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“…Large field-of-view (FoV) hard X-ray imagers, like the IBIS/ ISGRI on-board INTEGRAL (20 keV-1 MeV; Ubertini et al, 2003;Lebrun et al, 2003) and the BAT on-board Swift (15-150 keV; Barthelmy et al, 2005), have been very efficient in catching a large number of sporadic SFXT outbursts and proved particularly well suited to study the brightest luminosity states achieved by these sources ( 10 35 erg s −1 ; see, e.g., Romano et al, 2014a). The long-term monitoring data now available have been exploited to estimate the SFXT activity duty-cycle (DC; see, e.g., R14; Paizis & Sidoli, 2014, hereafter P14).…”

Section: Introductionmentioning

confidence: 99%

Supergiant fast X-ray transients as an under-luminous class of supergiant X-ray binaries

Bozzo

Romano

Ducci

et al. 2015

Advances in Space Research

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The usage of cumulative luminosity distributions, constructed thanks to the long-term observations available through wide field hard X-ray imagers, has been recently exploited to study the averaged high energy emission (>17 keV) from Supergiant Fast X-ray Transients (SFXTs) and classical Supergiant High Mass X-ray Binaries (SgXBs). Here, we take advantage of the long term monitorings now available with Swift/XRT to construct for the first time the cumulative luminosity distributions of a number of SFXTs and the classical SgXB IGR J18027-2016 in the soft X-ray domain with a high sensitivity focusing X-ray telescope (0.3-10 keV).By complementing previous results obtained in the hard X-rays, we found that classical SgXBs are characterized by cumulative distributions with a single knee around ∼10 36 -10 37 erg s −1 , while SFXTs are found to be systematically sub-luminous and their distributions are shifted at significantly lower luminosities (a factor of ∼10-100). As the luminosity states in which these sources spend most of their time are typically below the sensitivity limit of large field of view hard X-ray imagers, we conclude that soft X-ray monitorings carried out with high sensitivity telescopes are particularly crucial to reconstruct the complete profile of the SFXT cumulative luminosity distributions.The difference between the cumulative luminosity distributions of classical SgXBs and SFXTs is interpreted in terms of accretion from a structured wind in the former sources and the presence of magnetic/centrifugal gates or a quasi-spherical settling accretion regime in the latter.

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ISGRI: The INTEGRAL Soft Gamma-Ray Imager

Cited by 759 publications

References 15 publications

XMM-Newtonand INTEGRAL view of the hard state of EXO 1745−248 during its 2015 outburst

XMM-Newtonand INTEGRAL view of the hard state of EXO 1745−248 during its 2015 outburst

The first multi-wavelength campaign of AXP 4U 0142+61 from radio to hard X-rays

Supergiant fast X-ray transients as an under-luminous class of supergiant X-ray binaries

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