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Broad-Band Spectrum of The Black Hole Candidate IGR J17497-2821 Studied with Suzaku
A. Paizis, K. Ebisawa, H. Takahashi +9
The broad-band 1-300 keV Suzaku spectrum of IGR J17497-2821, the X-ray transient discovered by INTEGRAL in September 2006, is presented. Suzaku observed IGR J17497-2821 on Septembe…
INTEGRAL and XMM-Newton observations of AX J1845.0-0433
J. A. Zurita Heras, R. Walter
AX J1845.0-0433 is a transient high-mass X-ray binary discovered by ASCA. The source displays bright and short flares observed recently with INTEGRAL. The transient behaviour and t…
The multiwavelength variability of 3C 273
S. Soldi, M. Türler, S. Paltani +11
We present an update of 3C 273's database hosted by the ISDC, completed with data from radio to gamma-ray observations over the last 10 years. We use this large data set to study t…
A deep INTEGRAL hard X-ray survey of the 3C 273/Coma region
S. Paltani, R. Walter, I. M. McHardy +3
(abridged) We present an analysis of the deepest hard X-ray survey to date of about 2500 deg^2 performed by the IBIS instrument on board INTEGRAL in the 20-60 keV band, with a tota…
Probing Clumpy Stellar Winds in SFXTs
R. Walter, J. Zurita-Heras
Quantitative constraints on the wind clumping of massive stars can be obtained from the study of the hard X-ray variability of SFXTs. In these systems, a large fraction of the hard…
Multi-wavelength observations of Galactic hard X-ray sources discovered by INTEGRAL. I. The nature of the companion star
Sylvain Chaty, Farid Rahoui, Cédric Foellmi +3
Context: The INTEGRAL hard X-ray observatory has revealed an emerging population of highly obscured X-ray binary systems through multi-wavelength observations. Previous studies hav…
Probing clumpy stellar winds with a neutron-star
R. Walter, J. Zurita-Heras, J. -C. Leyder
INTEGRAL tripled the number of super-giant high-mass X-ray binaries (sgHMXB) known in the Galaxy by revealing absorbed and fast transient (SFXT) systems. Quantitative constraints o…
Hard X-ray emission from Eta Carinae
Jean-Christophe Leyder, Roland Walter, Gregor Rauw
Context : If relativistic particle acceleration takes place in colliding-wind binaries, hard X-rays and gamma-rays are expected through inverse Compton emission, but to date these…
Hard X-ray flares in IGR J08408-4503 unveil clumpy stellar winds
Jean-Christophe Leyder, Roland Walter, Michalis Lazos +2
Context : A 1000-s flare from a new hard X-ray transient, IGR J08408-4503, was observed by INTEGRAL on May 15, 2006 during the real-time routine monitoring of IBIS/ISGRI images per…
Probing clumpy stellar winds with a neutron star
R. Walter, J. Zurita Heras
INTEGRAL, the European Space Agency's gamma-ray observatory, tripled the number of super-giant high-mass X-ray binaries (sgHMXB) known in the Galaxy by revealing absorbed and fast…
2003--2005 INTEGRAL and XMM-Newton observations of 3C 273
M. Chernyakova, A. Neronov, T. J. -L. Courvoisier +9
The aim of this paper is to study the evolution of the broadband spectrum of one of the brightest and nearest quasars 3C 273. We analyze the data obtained during quasi-simultaneous…
The XMM-Newton/INTEGRAL monitoring campaign of IGR J16318-4848
A. Ibarra, G. Matt, M. Guainazzi +5
IGR J16318-4848 is the prototype and one of the more extreme examples of the new class of highly obscured Galactic X-ray sources discovered by INTEGRAL. A monitoring campaign on th…
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…
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…
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…
INTEGRAL and XMM-Newton observations of LSI +61 303
M. Chernyakova, A. Neronov, R. Walter
LSI +61 303 is one of the few X-ray binaries with Be star companion from which both radio and high-energy gamma-ray emission have been observed. We present XMM-Newton and INTEGRAL…
Orbital Parameters for the X-ray Pulsar IGR J16393-4643
T. W. J. Thompson, J. A. Tomsick, R. E. Rothschild +2
With recent and archival Rossi X-Ray Timing Explorer (RXTE) X-ray measurements of the heavily obscured X-ray pulsar IGR J16393-4643, we carried out a pulse timing analysis to deter…
INTEGRAL/IBIS Extragalactic survey: 20-100 keV selected AGN
L. Bassani, M. Molina, A. Malizia +10
Analysis of INTEGRAL Core Program and public Open Time observations performed up to April 2005 provides a sample of 62 active galactic nuclei in the 20-100 keV band above a flux li…
IGR J17252-3616: an accreting pulsar observed by INTEGRAL and XMM-Newton
J. A. Zurita Heras, G. De Cesare, R. Walter +5
The discovery of the X-ray source IGR J17252-3616 by INTEGRAL was reported on 9 February 2004. Regular monitoring by INTEGRAL shows that IGR J17252-3616 is a persistent hard X-ray…
Is the INTEGRAL/IBIS source IGR J17204-3554 a gamma-ray emitting galaxy hidden behind the molecular cloud NGC 6334 ?
L. Bassani, A. De Rosa, A. Bazzano +9
We report on the identification of a soft gamma-ray source, IGR J17204-3554, detected with the IBIS imager on board the INTEGRAL satellite. The source has a 20-100 keV flux of ~3x1…
IGR J16393-4643: a new heavily-obscured X-ray pulsar
A. Bodaghee, R. Walter, J. A. Zurita Heras +5
An analysis of the high-energy emission from IGR J16393-4643 (=AX J1639.0-4642) is presented using data from INTEGRAL and XMM-Newton. The source is persistent in the 20-40 keV band…
Using the ROSAT Catalogues to find counterparts for the second IBIS/ISGRI Survey Sources
J. B. Stephen, L. Bassani, A. Malizia +6
The second IBIS/ISGRI survey has produced a catalogue containing 209 hard X-ray sources visible down to a flux limit of around 1 milliCrab. The point source location accuracy of ty…
Global characteristics of the first IBIS/ISGRI catalogue sources: unveiling a murky episode of binary star evolution
A. J. Dean, A. Bazzano, A. B. Hill +10
INTEGRAL is the first gamma-ray astronomy mission with a sufficient sensitivity and angular resolution combination appropriate to the detection and identification of considerable n…