Search Publications
Discovery of the binary pulsar PSR B1259-63 in very-high-energy gamma rays around periastron with HESS
Raux, J.; Ripken, J.; Funk, S. +99 more
We report the discovery of very-high-energy (VHE) γ-ray emission of the binary system
The all-sky distribution of 511 keV electron-positron annihilation emission
Knödlseder, J.; Schanne, S.; Schönfelder, V. +11 more
We present a map of 511 keV electron-positron annihilation emission, based on data accumulated with the SPI spectrometer aboard ESA's INTEGRAL gamma-ray observatory, that covers approximately ~95% of the celestial sphere. Within the exposed sky area, 511 keV line emission is significantly detected towards the galactic bulge region and, at a very l…
INTEGRAL observations of recurrent fast X-ray transient sources
Hill, A. B.; Bird, A. J.; Ubertini, P. +9 more
Fast X-ray Transients (FXTs) are believed to be non-recurrent bright X-ray sources lasting less than a day and occuring at serendipitous positions, they can best be detected and discovered by instruments having a sufficiently wide field of view and high sensitivity. The IBIS/ISGRI instrument onboard INTEGRAL is particularly suited to detect new or…
INTEGRAL insight into the inner parts of the Galaxy. High mass X-ray binaries
Sunyaev, R.; Revnivtsev, M.; Lutovinov, A. +3 more
Since its launch INTEGRAL has devoted a significant fraction of its observing time to the Galactic plane region. We present the results of INTEGRAL observations of the inner spiral arms of the Galaxy (Norma, Scutum and Sagittarius) with attention to high mass X-ray binaries. The increased sensitivity of the survey and possibility to detect absorbe…
Gamma-ray continuum emission from the inner Galactic region as observed with INTEGRAL/SPI
Strong, A. W.; Bouchet, L.; Terrier, R. +5 more
The diffuse continuum emission from the Galactic plane in the energy range 18-1000 keV has been studied using 16 Ms of data from the SPI instrument on INTEGRAL. With such an exposure we can exploit the imaging properties of SPI to achieve a good separation of point sources from the various diffuse components. Using a candidate-source catalogue der…
INTEGRAL and RXTE observations of accreting millisecond pulsar IGR J00291+5934 in outburst
Goldoni, P.; Stella, L.; Kuiper, L. +7 more
Simultaneous observations of the accretion-powered millisecond pulsar IGR J00291+5934 by the International Gamma-Ray Astrophysics Laboratory and Rossi X-ray Timing Explorer during the 2004 December outburst are analysed. The average spectrum is well described by thermal Comptonization with an electron temperature of 50 keV and Thomson optical dept…
INTEGRAL discovery of persistent hard X-ray emission from the Soft Gamma-ray Repeater SGR 1806-20
Hurley, K.; Götz, D.; Mereghetti, S. +1 more
We report the discovery of persistent hard X-ray emission extending up to 150 keV from the soft gamma-ray repeater SGR 1806-20 using data obtained with the INTEGRAL satellite in 2003-2004. Previous observations of hard X-rays from objects of this class were limited to short duration bursts and rare transient episodes of strongly enhanced luminosit…
INTEGRAL spectroscopy of the accreting millisecond pulsar XTE J1807-294 in outburst
Goldoni, P.; Bonnet-Bidaud, J. M.; Kuiper, L. +6 more
The transient X-ray accreting millisecond pulsar XTE J1807-294 was observed during its February/March 2003 outburst by INTEGRAL, partly simultaneously with the XMM-Newton and RXTE satellites. We present here the first study of the 0.5-200 keV broad-band spectra of the source. On February 28, the source spectrum was consistent with thermal Comptoni…
Characterizing a new class of variability in GRS 1915+105 with simultaneous INTEGRAL/RXTE observations
Belloni, T.; Rodriguez, J.; Mirabel, I. F. +14 more
We report on the analysis of 100 ks INTEGRAL observations of the Galactic microquasar
INTEGRAL observations of SS433: Results of a coordinated campaign
Bikmaev, I. F.; Sunyaev, R. A.; Sakhibullin, N. A. +18 more
Results of simultaneous INTEGRAL and optical observations of the galactic microquasar SS433 in May 2003 and INTEGRAL /RXTE observations in March 2004 are presented. Persistent precessional variability with a maximum to minimum uneclipsed hard X-ray flux ratio of ∼ 4 is discovered. The 18 60 keV X-ray eclipse is found to be in phase with optical an…