Search Publications
INTEGRAL/IBIS search for e-e+ annihilation radiation from the galactic center region
Capitanio, F.; Ubertini, P.; Bazzano, A. +5 more
Electron positron annihilation radiation from the Galactic Center Region has been detected since the seventies, but its astrophysical origin is still a topic of a scientific debate. We have analyzed data of the gamma-ray imager IBIS/ISGRI onboard of ESA’s INTEGRAL platform in the e-e+ line. During the first year of the missio…
INTEGRAL and RXTE power spectra of Cygnus X-1
Nowak, M. A.; Wilms, J.; Pottschmidt, K. +3 more
We evaluate 0.03 20 Hz power spectra of the bright black hole binary Cyg X-1 obtained from non-deconvolved INTEGRAL-ISGRI event data. The ISGRI power spectra are compared to contemporary RXTE-PCA ones in the same hard X-ray energy band of 15 70 keV. They agree well in shape. Since the ISGRI power spectrum of Cyg X-1 is not background corrected it …
Two years of INTEGRAL observation of the BHC IGR J17464-3213
Capitanio, F.; Ubertini, P.; Bazzano, A. +4 more
On March 2003, IBIS, the γ-ray imager on board the INTEGRAL satellite, detected an outburst from a new source, IGR J17464-3213, that turned out to be an HEAO-1 transient, namely H1743-322. The spectral and temporal evolutions of the source were observed by INTEGRAL in different periods. Also RXTE observed the source for the first time on 2003 Marc…
Search for cyclotron lines in INTEGRAL/SPI spectra of Vela X-1
von Kienlin, A.; Schanne, S.; Kretschmar, P. +5 more
The wind-accreting X-ray binary pulsar Vela X-1 has been observed during the two INTEGRAL Core Program observations of the Vela region in June July and November December 2003. Preliminary results on time averaged and time resolved spectra of INTEGRAL/SPI for the two observation epochs are presented. Time averages have been used in order to increas…
Two years of INTEGRAL result on X-ray binaries
Ubertini, P.; ISWT Survey Team
INTEGRAL is the ESA lead International Gamma-Ray Astrophysical Laboratory, successfully launched the 17th October 2002 from Baikonur with a Proton vehicle. In view of the high sensitivity of the two γ-ray instruments IBIS and SPI and their capability to provide at the same time image, spectra and time profiles of all the sources in their wide fiel…
INTEGRAL: New perspectives for astrophysical nucleospectroscopy
Diehl, Roland
The high-energy spectrum of Cygnus X-1 as measured by INTEGRAL
Goldoni, P.; Rodriguez, J.; Malzac, J. +6 more
The INTEGRAL satellite observed the binary black hole system Cygnus X-1 on 2003 June 7 11. The source was detected up to 800 keV, its spectrum beeing compatible with a power law of photon index 2.3. In the framework of the accreting black hole phenomenology, the source was in an unusual state, probably the so-called “intermediate state”. Using the…
X-ray and Gamma-ray properties of AGN: Results from XMM-Newton, Chandra and INTEGRAL
Komossa, Stefanie
The X-ray observatories XMM-Newton and Chandra provided a wealth of exciting new results on active galaxies, and many more are expected to emerge soon from the Gamma-ray mission INTEGRAL. Chandra delivered X-ray images of outstanding detail, reaching subarcsecond spatial resolution for the first time in X-ray astronomy. XMM-Newton with its high se…
26Al spectroscopy with SPI: The challenge to detect Galactic rotation
Strong, A. W.; Hartmann, D. H.; Diehl, R. +1 more
The shape of the γ-ray line from radioactive 26Al, at 1808.7 keV energy in the frame of the decaying isotope, is determined by its kinematics when it decays, typically 10 6 yr after its ejection into the interstellar medium from its nucleosynthesis source. Three prior measurements of the line width exist: HEAO-C's 1982 value …
Spectral behaviour of an INTEGRAL sample of black hole candidates: Initial results
Capitanio, F.; Bazzano, A.; Cadolle Bel, M. +13 more
In this paper, we present the spectral characteristics of a sample of Black Hole Candidates observed with the IBIS, SPI and JEM-X instruments on board the INTEGRAL Gamma-ray Observatory. This work is part of the long term, systematic, spectral study programme of intermediate intensity BHC (<500 mCrab) within the INTEGRAL Core Programme observat…