A5101619191- Astrophysical Phenomena and Observations
- Gamma-ray bursts and supernovae
- Astrophysics and Cosmic Phenomena
- Astronomical Observations and Instrumentation
- Particle Detector Development and Performance
- Astronomy and Astrophysical Research
- Pulsars and Gravitational Waves Research
- Nuclear Physics and Applications
- Stellar, planetary, and galactic studies
- Astro and Planetary Science
- Astrophysics and Star Formation Studies
- Dark Matter and Cosmic Phenomena
- Particle Accelerators and Free-Electron Lasers
- Calibration and Measurement Techniques
- X-ray Spectroscopy and Fluorescence Analysis
- Mechanics and Biomechanics Studies
- Radiation Detection and Scintillator Technologies
- High-pressure geophysics and materials
- Geophysics and Gravity Measurements
- Solar and Space Plasma Dynamics
- Atomic and Molecular Physics
- Advanced X-ray Imaging Techniques
- Scientific Research and Discoveries
- Advanced X-ray and CT Imaging
- CCD and CMOS Imaging Sensors
Institut de Recherche en Astrophysique et Planétologie
2013-2024
Université de Toulouse
2009-2024
Centre National de la Recherche Scientifique
2007-2024
Université Toulouse III - Paul Sabatier
1998-2024
Roche (France)
2004-2024
Roche (Switzerland)
2001-2013
Max Planck Institute for Extraterrestrial Physics
2013
Laboratoire d'Analyse et d'Architecture des Systèmes
1997-2010
Université Paris Cité
2010
Laboratoire AstroParticule et Cosmologie
2010
SPI is a high spectral resolution gamma-ray telescope on board the ESA mission INTEGRAL (International Gamma Ray Astrophysics Laboratory). It consists of an array 19 closely packed germanium detectors surrounded by active anticoincidence shield BGO. The imaging capabilities instrument are obtained with tungsten coded aperture mask located 1.7 m from Ge array. fully field-of-view , partially field view amounts to and angular . energy range extends 20 keV 8 MeV typical 2.5 at 1.3 MeV. Here we...
A recent redetermination of the nonthermal component hard X-ray to soft γ-ray emission from Galactic ridge, using SPI instrument on International Gamma-Ray Astrophysics Laboratory (INTEGRAL), is shown be well reproduced as inverse Compton interstellar medium. Both cosmic-ray primary electrons and secondary positrons contribute emission. The prediction uses GALPROP model includes a new calculation radiation field. This may solve long-standing mystery origin this emission, potentially opens...
Aims. We study the spectrum of cosmic X-ray background (CXB) in energy range ~5-100 keV.
We have processed the data accumulated with INTEGRAL SPI instrument over 4 years (~51 Ms) to study morphology of Galactic "diffuse" emission in 20 keV 8 MeV energy range. To achieve this, we simultaneously derived an all-sky census emitting sources and images ridge (GR) emission. In central radian, resolved point-source amounts 88%, 91%, 68% total 25-50, 50-100, 100-300 domains, respectively. compare spatial distribution GR distributions obtained from CO near-IR maps quantify our results...
Significant advances have been made in the understanding of diffuse Galactic hard X-ray continuum emission using data from INTEGRAL observatory. The power-law component seen with INTEGRAL/SPI spectrometer has identified inverse-Compton relativistic (GeV) electrons on cosmic microwave background and interstellar radiation field. In present analysis, SPI 2003 to 2009, a total exposure time ~ 10^8 s, are used derive ridge spatial distribution spectrum between 20 keV 2.4 MeV. Both consistent...
To take advantage of the astrophysical potential Gamma-Ray Bursts (GRBs), Chinese and French astrophysicists have engaged SVOM mission (Space-based multi-band astronomical Variable Objects Monitor). Major advances in GRB studies resulting from synergy between space ground observations, implements instrumentation. The scientific objectives put a special emphasis on two categories GRBs: very distant GRBs at z$>$5 which constitute exceptional cosmological probes, faint/soft nearby allow...
Context. Gamma-ray bursts (GRBs) can be detected at cosmological distances, and therefore used to study the contents phases of early Universe. The 4−150 keV wide-field trigger camera ECLAIRs on board Space-based multi-band Variable Object Monitor (SVOM) mission, dedicated studying high-energy transient sky in synergy with multi-messenger follow-up instruments, has been adapted detect high- z GRBs. Aims. Investigating detection capabilities for high-redshift GRBs estimating impacts...
The diffuse continuum emission from the Galactic plane in energy range 18–1000 keV has been studied using 16 Ms of data SPI instrument on INTEGRAL. With such an exposure we can exploit imaging properties to achieve a good separation point sources various components. Using candidate-source catalogue derived with IBIS INTEGRAL and number sky distribution models obtained spectra resolved longitude. We identify spectral components power law shape index about 1.7, positron annihilation component...
The SPI instrument has been launched on-board the INTEGRAL observatory on October 17, 2002. is a spectrometer devoted to sky observation in 20 keV–8 MeV energy range using 19 germanium detectors. performance of cryogenic system nominal and allows cool kg down 85 K with comfortable margin. resolution whole camera 2.5 keV at 1.1 MeV. This degrades time due particle irradiation space. We show that annealing process recovery initial performance. anticoincidence shield works as expected, low...
view Abstract Citations (191) References (26) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS SIGMA Discovery of Variable E +- - Annihilation Radiation from the Near Galactic Center Compact Source 1E 1740.7-2942 Bouchet, L. ; Mandrou, P. Roques, J. Vedrenne, G. Cordier, B. Goldwurm, A. Lebrun, F. Paul, Sunyaev, R. Churazov, E. Gilfanov, M. Pavlinsky, Grebenev, S. Babalyan, Dekhanov, I. Khavenson, N. A series observations center have been performed by hard...
The source 1E 1740.7-2942 is known to be the brightest hard X-ray close dynamic center of our Galaxy. Three apparently different spectral states this were detected by GRANAT observatory during 1990-1991 observations Galactic Center (GC) region. In almost all 1990 had Cyg X-1-like spectrum with nearly constant flux. hardest (observed on October 13-14) exhibits a prominent high-energy bump at 300-600 keV, probably related annihilation processes in relatively cold electron-positron plasma
Diffuse emission is often challenging since it undetectable by most instruments, which are generally dedicated to point-source studies. The 26Al a good illustration: the only available map date has been released, more than 15 yr ago, thanks COMPTEL instrument. However, at present time, SPI spectrometer aboard International Gamma-Ray Astrophysics Laboratory mission offers unique opportunity enrich this first result. In paper, 2 × 108 s of data accumulated between 2003 and 2013 used perform...
The 511 keV positron annihilation emission remains a mysterious component of the high energy our Galaxy. Its study was one key scientific objectives SPI spectrometer on board International Gamma-Ray Astrophysics Laboratory satellite. In fact, lot observing time has been dedicated to Galactic disk with particular emphasis central region. A crucial issue in such an analysis concerns reduction technique used treat this huge quantity data, and more particularly background modeling. Our method,...
The different electron distributions in the hard and soft spectral states (HS SS) of BH binaries could be caused by kinetic processes changing because varying physical conditions corona. In presence a magnetic field corona, distribution can appear thermal, even when acceleration mechanisms would produce non thermal distributions. This is due to fast efficient thermalization through synchrotron self-absorption. We have analyzed data from 6 years observations Cygnus X-1 with INTEGRAL...
Gamma-Ray Bursts (GRBs) are often referred to as the most luminous explosions in Universe, due their short and highly prompt emission. This apparent luminosity, however, does not reflect true energy budget of emission, which is strongly beamed. Accurate estimations radiated during phase require taking into account geometry GRB jets, remains poorly known. Nevertheless, one may establish distribution well measured quantities, like Eiso, isotropic equivalent energy, encrypts crucial information...
Abstract Gamma-ray bursts (GRBs) are often referred to as the most luminous explosions in Universe, due their short and highly prompt emission. This apparent luminosity, however, does not reflect true energy budget of emission, which is strongly beamed. Accurate estimations radiated during phase require taking geometry GRB jets into account, remains poorly known. Nevertheless, one may establish distribution well-measured quantities, like E iso , isotropic equivalent energy, encrypts crucial...
Three calibration campaigns of the spectrometer SPI have been performed before launch in order to determine instrument characteristics, such as effective detection area, spectral resolution and angular resolution. Absolute determination area has obtained from simulations measurements. At 1 MeV, is 65 cm^2 for a point source on optical axis, ~2.3 keV. The better than 2.5 deg separation capability about deg. Some temperature dependant parameters will require permanent in-flight calibration.
The day after its discovery by the Watch instrument, X-ray nova GRS 1124-684 in Musca was detected soft γ-ray telescope SIGMA at limit of field view. pointed source seven other times between 1991 January and February, has always been up to 300 keV, showing it one hardest objects sky. After flare 9 average spectrum is well fitted a power law index 2.38, light curve shows slower decrease than observed low energy with superposed variability on time scales several hours
The microquasar 1E 1740.7-2942 is observed with Integral since Spring 2003. Here, we report on the source high energy behaviour by using first three years of data collected SPI and IBIS telescopes, taking advantage instruments complementarity. Light curves analysis showed two main states for 1740.7-2942: canonical low/hard state black-hole candidates a ``dim'' state, characterised ~ 20 times fainter emission, detected only below 50 keV when summing more than 1Ms data. For time continuum has...
We present the updated INTEGRAL catalogue of gamma-ray bursts (GRBs) observed between December 2002 and February 2012. The contains spectral parameters for 59 GRBs localized by Burst Alert System (IBAS). used data from two main instruments on board satellite: spectrometer SPI (SPectrometer INTEGRAL) nominally covering energy range 20 keV−8 MeV, imager IBIS (the Imager Board Satellite) operating in 15 keV to 10 MeV. For analysis we applied a new extraction technique, developed explore regions...
view Abstract Citations (57) References (25) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Sigma Detection of Hard X-Ray Emission from the Soft Transient Type I Burster KS 1731-260 Barret, D. ; Bouchet, L. Mandrou, P. Roques, J. Cordier, B. Laurent, Ph. Lebrun, F. Paul, Sunyaev, R. Churazov, E. Gilfanov, M. Diachkov, A. Khavenson, N. Novikov, Chulkov, I. Kuznetsov, Observations 1731 - 260 by French hard X-ray/soft gamma-ray telescope reveal existence a...
The nebula powered by the Vela pulsar is one of best examples an evolved wind nebula, allowing access to particle injection history and interaction with supernova ejecta. We report on INTEGRAL discovery extended emission above 18 keV from nebula. northern side has no known counterparts it appears larger more significant than southern one, which in turn partially coincident cocoon, soft X-ray, TeV filament toward center remnant. also present spectrum 18–400 energy range as measured IBIS/ISGRI...