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Unveiling the nature of INTEGRAL objects through optical spectroscopy. VII. Identification of 20 Galactic and extragalactic hard X-ray sources
N. Masetti, P. Parisi, E. Palazzi +17
Within the framework of our program of assessment of the nature of unidentified or poorly known INTEGRAL sources, we present here spectroscopy of optical objects, selected through…
Hard X-ray observations of PSR J1833-1034 and its associated pulsar wind nebula
A. De Rosa, P. Ubertini, R. Campana +3
PSR J1833-1034 and its associated Pulsar Wind Nebula (PWN) has been investigated in depth through X-ray observations ranging from 0.1 to 200 keV. The low energy X-ray data from Cha…
INTEGRAL/IBIS and Swift/XRT observations of hard cataclysmic variables
R. Landi, L. Bassani, A. J. Dean +5
The analysis of the third INTEGRAL/IBIS survey has revealed several new cataclysmic variables, most of which turned out to be intermediate polars, thus confirming that these object…
The two INTEGRAL X-ray transients IGR J17091--3624 and IGR J17098--3628: a multi-wavelength long term campaign
F. Capitanio, M. Giroletti, M. Molina +7
IGR J17091-3624 and IGR J17098-3628 are two X-ray transients discovered by INTEGRAL and classified as possible black hole candidates (BHCs). We present here the results obtained fr…
A broad-band spectral analysis of eight radio loud type 1 AGN selected in the hard X-ray band
M. Molina, L. Bassani, A. Malizia +6
Starting from a complete sample of type I AGN observed by INTEGRAL in the 20-40 keV band, we have selected a set of 8 AGN which can be classified as radio loud objects according to…
X-ray observations of the Large Magellanic Cloud pulsar PSR B0540-69 and its PWN
R. Campana, T. Mineo, A. De Rosa +3
PSR B0540-69 is a young pulsar in the Large Magellanic Cloud that has similar properties with respect to the Crab Pulsar, and is embedded in a Pulsar Wind Nebula. We have analyzed…
The properties of the putative pulsar associated with IGR J18135-1751/HESS J1813-178
A. J. Dean, A. B. Hill
Context: We investigate the possible theoretical properties of the putative pulsar associated with the pulsar wind nebula IGR J18135-1751/HESS J1813-178 based upon recent gamma-ray…
Unveiling the nature of INTEGRAL objects through optical spectroscopy. VI. A multi-observatory identification campaign
N. Masetti, E. Mason, L. Morelli +18
Using 8 telescopes in the northern and southern hemispheres, plus archival data from two on-line sky surveys, we performed a systematic optical spectroscopic study of 39 putative c…
High-redshift blazar identification for Swift J1656.3-3302
N. Masetti, E. Mason, R. Landi +9
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…
Probing the nature of IGR J16493-4348: Spectral and temporal analysis of the 1-100 keV emission
A. B. Hill, A. J. Dean, R. Landi +5
IGR J16493-4348 was one of the first new sources to be detected by the INTEGRAL gamma-ray telescope in the 18-100 keV energy band. Based upon spatial coincidence the source was ori…
INTEGRAL observations of PSR J1811-1925 and its associated Pulsar Wind Nebula
A. J. Dean, A. De Rosa, V. A. McBride +6
We present spectral measurements made in the soft (20-100 keV) gamma-ray band of the region containing the composite supernova remnant G11.2-0.3 and its associated pulsar PSR J1811…
INTEGRAL detection of the pulsar wind nebula in PSR J1846-0258
V. A. McBride, A. J. Dean, A. Bazzano +6
We communicate the detection of soft (20--200 keV) gamma-rays from the pulsar and pulsar wind nebula of PSR J1846-0258 and aim to identify the component of the system which is resp…
IGR J22517+2218=MG3 J225155+2217: a new gamma-ray lighthouse in the distant Universe
L. Bassani, R. Landi, A. Malizia +7
We report on the identification of a new soft gamma ray source, namely IGR J22517+2218, detected with IBIS/INTEGRAL. The source, which has an observed 20-100 keV flux of ~4 x10^-11…
Broadband X-ray spectrum of the newly discovered broad line radio galaxy IGR J21247+5058
M. Molina, M. Giroletti, A. Malizia +7
In this paper we present radio and high energy observations of the INTEGRAL source IGR J21247+5058, a broad line emitting galaxy obscured by the Galactic plane. Archival VLA radio…
INTEGRAL observations of the Small Magellanic Cloud
V. A. McBride, M. J. Coe, A. J. Bird +10
The first INTEGRAL observations of the Small Magellanic Cloud (carried out in 2003) are reported in which two sources are clearly detected. The first source, SMC X-1, shows a hard…
An unexpected outburst from A0535+262
A. B. Hill, A. J. Bird, A. J. Dean +6
A0535+262 is a transient Be/X-ray binary system which was in a quiescent phase from 1994-2005. In this paper we report on the timing and spectral properties of the INTEGRAL detecti…
HESS J1616-508: likely powered by PSR J1617-5055
R. Landi, A. De Rosa, A. J. Dean +3
HESS J1616-508 is one of the brightest emitters in the TeV sky. Recent observations with the IBIS/ISGRI telescope on board the INTEGRAL spacecraft have revealed that a young, nearb…
The AGN nature of 11 out of 12 Swift/RXTE unidentified sources through optical and X-ray spectroscopy
R. Landi, N. Masetti, L. Morelli +9
The Swift Burst Alert Telescope (BAT) is performing a high Galactic latitude survey in the 14-195 keV band at a flux limit of ~10^{-11} erg cm^{-2} s^{-1}, leading to the discovery…
INTEGRAL high energy detection of the transient IGR J11321-5311
V. Sguera, A. Bazzano, A. J. Bird +5
Context: The transient hard X-ray source IGR J11321-5311 was discovered by INTEGRAL on June 2005, during observations of the Crux spiral arm. To date, this is the only detection of…
Polarisation studies of the prompt gamma-ray emission from GRB 041219a using the Spectrometer aboard INTEGRAL
S. McGlynn, D. J. Clark, A. J. Dean +6
The spectrometer aboard INTEGRAL, SPI, has the capability to detect the signature of polarised emission from a bright gamma-ray source. GRB 041219a is the most intense burst locali…
IGR J18483-0311: an accreting X-ray pulsar observed by INTEGRAL
V. Sguera, A. B. Hill, A. J. Bird +8
IGR J18483-0311 is a poorly known transient hard X-ray source discovered by INTEGRAL during observations of the Galactic Center region performed between 23--28 April 2003. Aims: To…
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…
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…