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25 papers · 2 filters
New outbursts of the black hole candidate H1743-322/IGR J17464-3213 observed by INTEGRAL
F. Capitanio, A. Bazzano, P. Ubertini +1
On March 2003, INTEGRAL/IBIS detected an outburst from a new source, IGR J17464-3213, that turned out to be a HEAO-1 transient, namely H1743-322. Its fux decayed below the RXTE PCA…
Soft X and Gamma ray emission from TeV sources observed with Swift and INTEGRAL
A. De Rosa, P. Ubertini, A. Bazzano +4
The soft X-ray and soft gamma observations of the new discovered TeV sources by HESS and MAGIC are crucial to discriminate between various emitting scenarios and to fully understan…
The first detection of Compton Reflection in the Low-Mass X-ray Binary 4U1705-44 with INTEGRAL and BeppoSAX
Mariateresa Fiocchi, Angela Bazzano, Pietro Ubertini +1
We present data from INTEGRAL and BeppoSAX satellites showing spectral state transitions of the neutron-star, atoll-type, low-mass X-ray binary 1705-44. Its energy spectrum can be…
The 3rd IBIS/ISGRI soft gamma-ray survey catalog
A. J. Bird, A. Malizia, A. Bazzano +20
In this paper we report on the third soft gamma-ray source catalog obtained with the IBIS/ISGRI gamma-ray imager on board the INTEGRAL satellite. The scientific dataset is based on…
INTEGRAL and Swift observations of the supergiant fast X-ray transient AXJ1845.0-0433=IGRJ18450-0435
V. Sguera, A. J. Bird, A. J. Dean +8
Context: AXJ1845.0-0433 was discovered by ASCA in 1993 during fast outburst activity characterized by several flares on short timescales. Up to now, the source was not detected aga…
INTEGRAL observations of the X-ray burster 4U1850-087: first detection of hard X-ray emission extending above 50keV
Lara Sidoli, Ada Paizis, Angela Bazzano +1
The X-ray burster 4U1850-087, located in the globular cluster NGC6712, is an ultracompact binary likely harbouring a degenerate companion.The source has been observed with INTEGRAL…
A Possible Magnetar Nature for IGR J16358-4726
S. K. Patel, J. Zurita, M. Del Santo +10
We present detailed spectral and timing analysis of the hard x-ray transient IGR J16358-4726 using multi-satellite archival observations. A study of the source flux time history ov…
SWIFT/XRT follow-up observations of INTEGRAL AGNs
R. Landi, A. Malizia, L. Bassani +9
In five years of operation, data from INTEGRAL has been used to discover a large number of gamma-ray sources, a substantial fraction of which have turned out to be active galactic…
Following the Colour of the Low Mass X-ray Binary 4U 1820-30 with INTEGRAL
Antonella Tarana, Angela Bazzano, Pietro Ubertini +2
The 4-200 keV spectral and temporal behaviour of the low mass X-ray binary 4U 1820-30 has been studied with INTEGRAL during 2003-2005. This source as been observed in both the soft…
Observing the high energy behaviour of the low mass X-ray binary XB 1832-330 with INTEGRAL
Antonella Tarana, Angela Bazzano, Pietro Ubertini +1
We report INTEGRAL/IBIS results on temporal and spectral behaviour of the Low Mass X-ray Binary XB 1832-330 located in the globular cluster NGC 6652. During the 2003-2005 monitorin…
Hard tail detection in the LMXB 4U1636-53 from INTEGRAL
M. Fiocchi, A. Bazzano, P. Ubertini +1
Recent INTEGRAL observations and archival BeppoSAX data have been analyzed to deeply investigate the hard X-ray behavior of the neutron star, atoll type, low mass X-ray Binary 4U16…
Spectral analysis of the Low-Mass X-ray Binary 4U~1705--44
M. Fiocchi, A. Bazzano, P. Ubertini +1
\integral and \sax observations of the neutron-star LMXB 4U~1705--44 have been analysed to deeply investigate the spectral state transitions nature. Its energy spectrum can be desc…
The ultra-compact binary 4U1850-087 observed with INTEGRAL: hard X-ray emission from an X-ray burster
L. Sidoli, A. Paizis, A. Bazzano +1
The X-ray burster 4U1850-087, located in the Galactic globular cluster NGC6712, is an ultracompact binary (orbital period~21 min),likely harbouring a degenerate companion.The sourc…
On the multiwavelength spectrum of the microquasar 1E 1740.7-2942
V. Bosch-Ramon, G. E. Romero, J. M. Paredes +3
Context. The microquasar 1E 1740.7-2942 is a source located in the direction of the Galactic Center. It has been detected at X-rays, soft gamma-rays, and in the radio band, showing…
INTEGRAL spectral variability study of the atoll 4U 1820-30: first detection of hard X-ray emission
Antonella Tarana, Angela Bazzano, Pietro Ubertini +1
We study the 4-200 keV spectral and temporal behaviour of the low mass X-ray binary 4U 1820-30 with INTEGRAL during 2003-2005. This source as been observed in both the soft (banana…
Unveiling the nature of INTEGRAL objects through optical spectroscopy. V. Identification and properties of 21 southern hard X-ray sources
N. Masetti, L. Morelli, E. Palazzi +13
Optical spectroscopic identification of the nature of 21 unidentified southern hard X-ray objects is reported here in the framework of our campaign aimed at determining the nature…
A Hard X-ray View on Scorpius X-1 with INTEGRAL: non-Thermal Emission ?
T. Di Salvo, P. Goldoni, L. Stella +12
We present here simultaneous INTEGRAL/RXTE observations of Sco X-1, and in particular a study of the hard X-ray emission of the source and its correlation with the position in the…
Integral/Ibis Census of the Sky Beyond 100 kev
A. Bazzano, J. B. Stephen, M. Fiocchi +8
We report on the first census of INTEGRAL/IBIS detections ( significance) above 100 keV based on the Core Program and public Open time observations up to April 2005. Th…
INTEGRAL observations of the cosmic X-ray background in the 5-100 keV range via occultation by the Earth
E. Churazov, R. Sunyaev, M. Revnivtsev +32
We study the spectrum of the cosmic X-ray background (CXB) in energy range 5-100 keV. Early in 2006 the INTEGRAL observatory performed a series of four 30ksec observations wi…
First broad band study of the mysterious source 1E 1743.1-2843
M. Del Santo, L. Sidoli, A. Bazzano +4
In the last years, the persistent source 1E 1743.1-2843 has been observed in the X-rays, but never above 20 keV. In previous works, it was stressed that a possible high energy emis…
Swift/XRT follow-up observations of TeV sources of the HESS Inner Galaxy survey
R. Landi, L. Bassani, A. Malizia +6
In order to provide a firm identification of the newly discovered Galactic TeV sources, a search for counterparts in a broad band from soft X-ray to soft gamma-rays is crucial as d…
Average hard X-ray emission from NS LMXBs: Observational evidence of different spectral states in NS LMXBs
A. Paizis, R. Farinelli, L. Titarchuk +9
We studied and compared the long-term average hard X-ray (>20keV) spectra of a sample of twelve bright low-mass X-ray binaries hosting a neutron star (NS). Our sample comprises the…
Disc-Jet coupling in the LMXB 4U1636-53 from INTEGRAL
Mariateresa Fiocchi, Angela Bazzano, Pietro Ubertini +1
We report on the spectral analysis results of the neutron star, atoll type, low mass X-ray Binary 4U1636-53 observed by INTEGRAL and BeppoSAX satellites. Spectral behavior in three…
Unveiling the nature of INTEGRAL objects through optical spectroscopy. IV. A study of six new hard X-ray sources
N. Masetti, L. Bassani, A. Bazzano +9
We present further results from our ongoing optical spectrophotometric campaign at the Astronomical Observatory of Bologna in Loiano (Italy) on unidentified hard X-ray sources dete…