The INTEGRAL/IBIS scientific data analysis

Goldwurm, A.; David, Pedro; Foschini, L.; Gros, A.; Laurent, Philippe; Sauvageon, A.; Bird, A. J.; Lerusse, L.; Produit, N.

doi:10.1051/0004-6361:20031395

Cited by 288 publications

(301 citation statements)

References 21 publications

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“…ISGRI sky mosaics (a combination of deconvolved images of single science windows) were produced in 10 logarithmically binned energy bands covering the 20-300 keV energy window. We used the imaging software tools (Goldwurm et al 2003) of the Offline Scientific Analysis (OSA) package version 5.1 distributed by the INTEGRAL Science Data Centre (ISDC, see e.g. Courvoisier et al 2003).…”

Section: Deep Isgri Sky Map Of Scutum Regionmentioning

confidence: 99%

High-energy characteristics of the schizophrenic pulsar PSR J1846-0258 in Kes 75

Kuiper

Hermsen

2009

A&A

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Aims. PSR J1846−0258 is a young rotation-powered pulsar with one of the highest surface magnetic field strengths, located in the centre of SN-remnant Kes-75. In June 2006 a magnetar-like outburst took place. Using multi-year RXTE and INTEGRAL observations covering the epoch of the outburst, we aim to study the temporal and spectral characteristics of PSR J1846−0258 over a broad ∼3-300 keV energy range to derive constraints on theoretical scenarios aiming to explain this schizophrenic behaviour. Methods. We explored all publically available RXTE observations of PSR J1846−0258 to generate accurate ephemerides over the period January 30, 2000-November 7, 2007. Phase-folding procedures yielded pulse profiles for RXTE PCA (∼3-30 keV), RXTE HEXTE (∼15-250 keV) and INTEGRAL ISGRI (∼20-300 keV). The pulsed spectrum over the full ∼3-300 keV energy range was derived, as well as the total spectrum (including the pulsar wind nebula) over the 20-300 keV band with the ISGRI. The timing, spatial, and spectral analyses were applied for epochs before, during, and after the magnetar-like outburst to study the evolution of the high-energy characteristics. Results. ISGRI detected PSR J1846−0258/Kes-75 before outburst during 2003-2006 with a power-law-shape spectrum over the 20-300 keV energy range with photon index Γ = 1.80 ± 0.06 and energy flux (20-300 keV) of (6.62 ± 0.35) × 10 −11 erg/cm 2 s. More than 90 days after the onset of the outburst, still during the decay phase, the same spectral shape was measured (Γ = 1.75 +0.27 −0.31 ) with an indication for a 52% (2.3σ) enhanced total emission, while one year after the outburst the hard X-ray non-thermal emission of PSR J1846−0258/Kes-75 was found to be back to its pre-outburst values. PCA monitoring of PSR J1846−0258 before the outburst yielded phase-coherent ephemerides confirming the earlier derived breaking index of the spindown. During the outburst, incoherent solutions have been derived. We show that the radiative outburst was triggered by a major spin-up glitch near MJD 53 883 ± 3 with a glitch size Δν/ν in the range (2.0−4.4) × 10 −6 . Using all pre-outburst observations of ISGRI and HEXTE for the first time pulse profiles have been obtained up to 150 keV with a broad single asymmetric pulse. The pulse shape did not vary with energy over the 2.9-150 keV energy range, nor did it change during the magnetar-like outburst. The time-averaged pre-outburst ∼3-300 keV pulsed spectrum measured with the PCA, HEXTE, and ISGRI was fitted with a power-law model with Γ = 1.20 ± 0.01. A fit with a curved power-law model gives an improved fit. Around 150 keV the pulsed fraction approaches 100%. For the first 32 days of the magnetarlike outburst, the 3-30 keV pulsed spectrum can be represented with two power laws, a soft component with index Γ s = 2.96 ± 0.06 and a hard component with the pre-outburst value Γ h ∼ 1.2. Above ∼9 keV, all spectra during outburst are consistent with the latter single power-law shape with index ∼1.2. The 2-10 keV flux increased by a factor ∼5 and the 10...

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Section: Deep Isgri Sky Map Of Scutum Regionmentioning

confidence: 99%

High-energy characteristics of the schizophrenic pulsar PSR J1846-0258 in Kes 75

Kuiper

Hermsen

2009

A&A

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“…The IBIS/ISGRI and JEM-X data were reduced with the standard analysis procedures of the Off-Line Scientific Analysis OSA 7.0 released by ISDC, with algorithms described in Goldwurm et al (2003) and Westergaard et al (2003) for ISGRI and JEM-X respectively. Systematic errors of 2% were added for both JEM-X (in the 5-25 keV range) and ISGRI (in the 18-200 keV range).…”

Section: Integralmentioning

confidence: 99%

Detailed radio to softγ-ray studies of the 2005 outburst of the new X-ray transient XTE J1818-245

Bel¹,

Prat

Rodríguez

et al. 2009

A&A

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Context. XTE J1818−245 is an X-ray nova that experienced an outburst in 2005, as first seen by the RXTE satellite. The source was observed simultaneously at various wavelengths up to soft γ-rays with the INTEGRAL satellite, from 2005 February to September, during our INTEGRAL Target of Opportunity program dedicated to new X-ray novae and during Galactic Bulge observations. Aims. X-ray novae are extreme systems that often harbor a black hole, and are known to emit throughout the electromagnetic spectrum when in outburst. The goals of our programme are to understand the physical processes close to the black hole and to study the possible connection with the jets that are observed in the radio. Methods. We analysed radio, (N)IR, optical, X-ray and soft γ-ray observations. We constructed simultaneous broad-band X-ray spectra covering a major part of the outburst, which we fitted with physical models. Analyzing both the light curves in various energy ranges and the hardness-intensity diagram enabled us to study the long-term behaviour of the source. Results. Spectral parameters were typical of the Soft Intermediate States and the High Soft States of a black hole candidate. The source showed relatively small spectral variations in X-rays with considerable flux variation in radio. Spectral studies showed that the accretion disc cooled down from 0.64 to 0.27 keV in ∼100 days and that the total flux decreased while the relative flux of the hot medium increased. Radio emission was detected several times, and, interestingly, five days after entering the HSS. Modeling the spectral energy distribution from the radio to the soft γ-rays reveals that the radio flares arise from several ejection events. Conclusions. XTE J1818−245 probably belongs to the class of low-mass X-ray binaries and is likely a black hole candidate transient source that might be closer than the Galactic Bulge. The results from the data analysis trace the physical changes that took place in the system (disc, jet/corona) at a maximum bolometric luminosity of 0.4-0.9 ×10 38 erg s −1 (assuming a distance between 2.8-4.3 kpc) and they are discussed within the context of disc and jet models.

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“…ISGRI data were processed using the standard INTEGRAL analysis software (OSA 5 v5.1; Goldwurm et al 2003). Events in the band 20-200 keV, coming from both fullycoded and partially-coded observations of the field of view of Swift J1656.3−3302, were included in the analysis.…”

Section: X-/gamma-ray Observationsmentioning

confidence: 99%

High-redshift blazar identification for Swift J1656.3-3302

Masetti

Mason

Landi

et al. 2008

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We report on the high-redshift blazar identification of a new gamma-ray source, Swift J1656.3−3302, detected with the BAT imager onboard the Swift satellite and the IBIS instrument on the INTEGRAL satellite. Follow-up optical spectroscopy has allowed us to identify the counterpart as an R ∼ 19 mag source that shows broad Lyman-α, Si iv, He ii, C iv, and C iii] emission lines at redshift z = 2.40 ± 0.01. Spectral evolution is observed in X-rays when the INTEGRAL/IBIS data are compared to the Swift/BAT results, with the spectrum steepening when the source gets fainter. The 0.7-200 keV X-ray continuum, observed with Swift/XRT and INTEGRAL/IBIS, shows the power law shape typical of radio loud (broad emission line) active galactic nuclei (with a photon index Γ ∼ 1.6) and a hint of spectral curvature below ∼2 keV, possibly due to intrinsic absorption (N H ∼ 7× 10 22 cm −2 ) local to the source. Alternatively, a slope change (∆Γ ∼ 1) around 2.7 keV can describe the X-ray spectrum equally well. At this redshift, the observed 20-100 keV luminosity of the source is ∼10 48 erg s −1 (assuming isotropic emission), making Swift J1656.3−3302 one of the most X-ray luminous blazars. This source is yet another example of a distant gamma-ray loud quasar discovered above 20 keV. It is also the farthest object, among the previously unidentified INTEGRAL sources, whose nature has been determined a posteriori through optical spectroscopy.

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The INTEGRAL/IBIS scientific data analysis

Cited by 288 publications

References 21 publications

High-energy characteristics of the schizophrenic pulsar PSR J1846-0258 in Kes 75

High-energy characteristics of the schizophrenic pulsar PSR J1846-0258 in Kes 75

Detailed radio to softγ-ray studies of the 2005 outburst of the new X-ray transient XTE J1818-245

High-redshift blazar identification for Swift J1656.3-3302

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