AGN's UV and X-ray luminosities in clumpy accretion flows (2008)
Ishibashi, W., Courvoisier, T. J. -L.
We consider the fuelling of the central massive black hole in Active Galactic Nuclei, through an inhomogeneous accretion flow. Performing simple analytical treatments, we show that shocks between...
AGN population in the deepest hard X-ray extragalactic survey (2008)
Paltani, S., Courvoisier, T. J. -L., Dwelly, T., McHardy, I. M., Walter, R.
We present the results of the analysis of the AGN population in the deepest extragalactic hard X-ray survey. The survey is based on INTEGRAL observation of the 3C 273/Coma cluster region, and covers...
The efficient low-mass Seyfert MCG-05-23-016 (2008)
Beckmann, V., Courvoisier, T. J. -L., Gehrels, N., Lubinski, P., Malzac, J., ...
The Seyfert 1.9 galaxy MCG-05-23-016 has been shown to exhibit a complex X-ray spectrum. This source has moderate X-ray luminosity, hosts a comparably low-mass black hole, but accretes at a high...
The multiwavelength variability of 3C 273 (2008)
Soldi, S., Türler, M., Paltani, S., Aller, H. D., Aller, M. F., Burki, G., ...
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 the multiwavelength...
A deep INTEGRAL hard X-ray survey of the 3C 273/Coma region (2008)
Paltani, S., Walter, R., McHardy, I. M., Dwelly, T., Steiner, C., Courvoisier, T. J. -L.
(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 total exposure time of...
INTEGRAL discovery of non-thermal hard X-ray emission from the Ophiuchus cluster (2007)
Eckert, D., Produit, N., Paltani, S., Neronov, A., Courvoisier, T. J. -L.
We present the results of deep observations of the Ophiuchus cluster of galaxies with INTEGRAL in the 3-80 keV band. We analyse 3 Ms of INTEGRAL data on the Ophiuchus cluster with the IBIS/ISGRI hard...
A particle acceleration site in the Coma cluster? (2007)
Eckert, D., Produit, N., Neronov, A., Courvoisier, T. J. -L.
We present the results of a deep (1.1 Ms) observation of the Coma cluster of galaxies in the 18-30 keV band with the IBIS/ISGRI imager on board the INTEGRAL satellite. We show that the source...
Hard X-ray Variability of AGN (2007)
Beckmann, V., Barthelmy, S. D., Courvoisier, T. J. -L., Gehrels, N., Soldi, S., Tueller, J., ...
Aims: Active Galactic Nuclei are known to be variable throughout the electromagnetic spectrum. An energy domain poorly studied in this respect is the hard X-ray range above 20 keV. Methods: The first...
Cygnus X-3 transition from the ultrasoft to the hard state (2007)
Beckmann, V., Soldi, S., Belanger, G., Brandt, S., Caballero-Garcia, M. D., De Cesare, G., ...
Aims: The nature of Cygnus X-3 is still not understood well. This binary system might host a black hole or a neutron star. Recent observations by INTEGRAL have shown that Cygnus X-3 was again in an...
South-West extension of the hard X-ray emission from the Coma cluster (2007)
Eckert, D., Neronov, A., Courvoisier, T. J. -L., Produit, N.
We explore the morphology of hard (18-30 keV) X-ray emission from the Coma cluster of galaxies. We analyze a deep (1.1 Ms) observation of the Coma cluster with the ISGRI imager on board the...
Bykov, A.M., Krassilchtchikov, A.M., Uvarov, Yu.A., Lebrun, F., Renaud, M., Terrier, R., ...
We report the detection of hard X-ray emission from the field of the star-forming region NGC 6334 with the the International Gamma-Ray Astrophysics Laboratory INTEGRAL. The JEM-X monitor and ISGRI...
A description of sources detected by INTEGRAL during the first 4 years of observations (2007)
Bodaghee, A., Courvoisier, T. J. -L., Rodriguez, J., Beckmann, V., Produit, N., Hannikainen, D., ...
Parameters from the literature, such as positions, photoelectric absorption (nH), spin and orbital periods, and distances or redshifts, were collected for all ~500 sources detected by INTEGRAL-ISGRI...
2003--2005 INTEGRAL and XMM-Newton observations of 3C 273 (2007)
Chernyakova, M., Neronov, A., Courvoisier, T. J. -L., Turler, M., Soldi, S., Beckmann, V., ...
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 INTEGRAL and XMM...
Paizis, A., Farinelli, R., Titarchuk, L., Courvoisier, T. J. -L., Bazzano, A., Beckmann, V., ...
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 six well studied...
The INTEGRAL Galactic bulge monitoring program: the first 1.5 years (2007)
Kuulkers, E., Shaw, S. E., Paizis, A., Chenevez, J., Brandt, S., Courvoisier, T. J. -L., ...
The Galactic bulge region is a rich host of variable high-energy point sources. Since 2005, February 17 we are monitoring the source activity in this region about every three days with INTEGRAL....
Cygnus X-3 transition from the ultrasoft to the hard state (2007)
Beckmann, V., Soldi, S., Bélanger, G., Brandt, S., Caballero-García, M. D., De Cesare, G., ...
Hunting the nature of IGR J17497-2821 with X-ray and NIR observations (2006)
Paizis, A., Nowak, M. A., Chaty, S., Rodriguez, J., Courvoisier, T. J. -L., Del Santo, M., ...
We report on a Chandra grating observation of the recently discovered hard X-ray transient IGR J17497-2821. The observation took place about two weeks after the source discovery at a flux level of...
Paizis, A., Farinelli, R., Titarchuk, L., Courvoisier, T. J. -L., Bazzano, A., Beckmann, V., ...
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 six well studied...
A historic jet-emission minimum reveals hidden spectral features in 3C 273 (2006)
Turler, M., Chernyakova, M., Courvoisier, T. J. -L., Foellmi, C., Aller, M. F., Aller, H. D., ...
Aims. The aim of this work is to identify and study spectral features in the quasar 3C 273 usually blended by its strong jet emission. Method. A historic minimum in the sub-millimetre emission of 3C...
IGR J16393-4643: a new heavily-obscured X-ray pulsar (2006)
Bodaghee, A., Walter, R., Zurita Heras, J.A., Bird, A.J., Courvoisier, T.J.-L., Malizia, A., ...
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 at an average flux...
Opening a New Window to Fundamental Physics and Astrophysics: X-ray Polarimetry (2006)
Costa, E., Bellazzini, R., Soffitta, P., Di Persio, G., Feroci, M., Morelli, E., ...
An extensive theoretical literature predicts that X-ray Polarimetry can directly determine relevant physical and geometrical parameters of astrophysical sources, and discriminate between models...
The INTEGRAL Galactic Bulge monitoring program (2006)
Kuulkers, E., Shaw, S., Brandt, S., Chenevez, J., Courvoisier, T. J. -L., Ebisawa, K., ...
The Galactic Bulge region is a rich host of variable high-energy point sources. These sources include bright and relatively faint X-ray transients, X-ray bursters, persistent neutron star and...
IGR J16393-4643: a new heavily-obscured X-ray pulsar (2006)
Bodaghee, A., Walter, R., Zurita Heras, J.A., Bird, A.J., Courvoisier, T.J.-L., Malizia, A., ...
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 at an average flux...
IGR J16393-4643: a new heavily-obscured X-ray pulsar (2006)
Bodaghee, A., Walter, R., Zurita Heras, J.A., Bird, A.J., Courvoisier, T.J.-L., Malizia, A., ...
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 at an average flux...
The INTEGRAL mission - an overview (2006)
Kretschmar, P., Winkler, C., Courvoisier, T.J.-L., Di Cocco, G., Diehl, R., Gehrels, N., ...
The INTEGRAL mission - an overview (2006)
Kretschmar, P., Winkler, C., Courvoisier, T.J.-L., Di Cocco, G., Diehl, R., Gehrels, N., ...
Bykov, A. M., Krassilchtchikov, A. M., Uvarov, Yu. A., Lebrun, F., Renaud, M., Terrier, R., ...
We report the detection of hard X-ray emission from the field of the star-forming region NGC 6334 with the the International Gamma-Ray Astrophysics Laboratory INTEGRAL. The JEM-X monitor and ISGRI...
IGR J16393-4643: a new heavily-obscured X-ray pulsar (2005)
Bodaghee, A., Walter, R., Heras, J. A. Zurita, Bird, A. J., Courvoisier, T. J. -L., Malizia, A., ...
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 at an average flux...
INTEGRAL observations of AGN in the Galactic Plane (2005)
Soldi, S., Beckmann, V., Bassani, L., Courvoisier, T. J. -L., Landi, R., Malizia, A., ...
We present results on approximately one year of INTEGRAL observations of six AGN detected during the regular scans of the Galactic Plane. The sample is composed by five Seyfert 2 objects (MCG...
AGN variability time scales and the discrete-event model (2005)
Favre, P., Courvoisier, T. J. -L., Paltani, S.
We analyse the ultraviolet variability time scales in a sample of 15 Type 1 Active Galactic Nuclei (AGN) observed by IUE. Using a structure function analysis, we demonstrate the existence in most...
Cascades of shocks in Active Galactic Nuclei and their radiation (2005)
Courvoisier, T. J. -L., Turler, M.
We discuss accretion flows on massive black holes in which different elements of the flow (clumps) have velocities that may differ substantially. We estimate the consequence of collisions between...
Chandra and RXTE spectroscopy of the accreting msec pulsar IGR J00291+5934 (2005)
Paizis, A., Nowak, M. A., Wilms, J., Courvoisier, T. J. -L., Ebisawa, K., Rodriguez, J., ...
We report on an observation of the recently discovered accreting millisecond X-ray pulsar IGR J00291+5934 performed with the RXTE-Proportional Counter Array (PCA) and Chandra-High Energy Transmission...
Resolving the Hard X-ray Emission of GX 5-1 with INTEGRAL (2005)
Paizis, A., Ebisawa, K., Tikkanen, T., Rodriguez, J., Chenevez, J., Kuulkers, E., ...
We present the study of one year of INTEGRAL data on the neutron star low mass X-ray binary GX 5-1. Thanks to the excellent angular resolution and sensitivity of INTEGRAL, we are able to obtain a...
Ebisawa, K., Tsujimoto, M., Paizis, A., Hamaguchi, K., Bamba, A., Cutri, R., ...
Using the Chandra Advanced CCD Imaging Spectrometer Imaging array (ACIS-I), we have carried out a deep hard X-ray observation of the Galactic plane region at (l,b) ~ (28.5, 0.0), where no discrete...
Hard X-ray diffuse emission from the Galactic Center seen by INTEGRAL (2005)
Neronov, A., Chernyakova, M., Courvoisier, T. J. -L., Walter, R.
We study the hard X-ray (20-100 keV) variability of the Galactic Center (GC) and of the nearby sources on the time scale of 1000 s. We find that 3 of the 6 hard X-ray sources detected by INTEGRAL...
Shaw, S. E., Mowlavi, N., Rodriguez, J., Ubertini, P., Capitanio, F., Ebisawa, K., ...
We report the discovery of a high-energy transient with the IBIS/ISGRI detector on board the INTEGRAL observatory. The source, namely IGR J00291+5934, was first detected on 2nd December 2004 in the...
Bykov, A.M., Krassilchtchikov, A.M., Uvarov, Yu.A., Lebrun, F., Renaud, M., Terrier, R., ...
We report the detection of hard X-ray emission from the field of the star-forming region NGC 6334 with the the International Gamma-Ray Astrophysics Laboratory INTEGRAL. The JEM-X monitor and ISGRI...
Bykov, A.M., Krassilchtchikov, A.M., Uvarov, Yu.A., Lebrun, F., Renaud, M., Terrier, R., ...
We report the detection of hard X-ray emission from the field of the star-forming region NGC 6334 with the the International Gamma-Ray Astrophysics Laboratory INTEGRAL. The JEM-X monitor and ISGRI...
INTEGRAL sees XTE J1739-285 change to hard state (2005)
Shaw, S.E., Kuulkers, E., Oosterbroek, T., Courvoisier, T.J.-L., Paizis, A., Ebisawa, K., ...
Continuing INTEGRAL Galactic Bulge Monitoring observations have detected the X-ray transient XTE J1739-285 above 20 keV. XTE J1739-285 was first detected by INTEGRAL during JEM-X observations on...
Type-I X-ray bursts from XTE J1739-285 (2005)
Brandt, S., Kuulkers, E., Bazzano, A., Courvoisier, T.J.-L., Domingo, A., Ebisawa, K., ...
During the Galactic Bulge Monitoring and Galactic Centre Scan observations performed with INTEGRAL, two X-ray flares coming from XTE J1739-285 were observed with the X-ray monitor JEM-X (3-25 keV)....
On the (hard) X-ray activity of SAX J1747.0-2853 as seen with INTEGRAL (2005)
Kuulkers, E., Kretschmar, P., Brandt, S., Wijnands, R.A.D., Courvoisier, T.J.-L., Ebisawa, K., ...
Following the report of the X-ray activity of the neutron star transient SAX J1747.0-2853 (ATels #637, #638, #641) we add that its current outburst was detected by INTEGRAL on Oct 10 and 12, 2005....
A possible feature of thermal matter in relativistic jets of radio-loud quasars (2004)
Wang, Jian-Min, Staubert, Ruediger, Courvoisier, T. J. -L.
It has been suggested that relativistic jets in quasars may contain a considerable amount of thermal matter. In this paper, we explore the possibility that the K-alpha line from the thermal matter...
INTEGRAL and XMM-Newton Spectral Studies of NGC 4388 (2004)
Beckmann, V., Gehrels, N., Favre, P., Walter, R., Courvoisier, T. J. -L., ...
We present first INTEGRAL and XMM-Newton observations of a Seyfert galaxy, the type 2 AGN NGC 4388. Several INTEGRAL observations performed in 2003 allow us to study the spectrum in the 20 - 300 keV...
The INTEGRAL LMXRB Monitoring Programme (2004)
Paizis, A., Courvoisier, T. J. -L., Vilhu, O., Chernyakova, M., Tikkanen, T., Bazzano, A., ...
Our collaboration is responsible for the study of a sample of 72 low mass X-ray binaries (LMXRB) using the INTEGRAL Core Programme data. In this paper we describe the monitoring programme we have...
Scientific Performance of the ISDC Quick Look Analysis (2004)
Shaw, S. E., Mowlavi, N., Ebisawa, K., Paizis, A., Rodriguez, J., Zurita, J., ...
The INTEGRAL Science Data Centre (ISDC) routinely monitors the Near Real Time data (NRT) from the INTEGRAL satellite. A first scientific analysis is made in order to check for the detection of new,...
INTEGRAL and RXTE observations of broad-line radio galaxy 3C 111 (2004)
Chernyakova, M., Favre, P., Courvoisier, T. J. -L., Lutovinov, A., Molkov, S., Beckmann, V., ...
3C 111 is an X-ray bright broad-line radio galaxy which is classified as a Fanaroff-Riley type II source with a double-lobe/single jet morphology, and reported superluminal motion. It is a well-known...
BeppoSAX observations of the quasar Markarian 205 (2004)
Favre, P., Beckmann, V., Courvoisier, T. J. -L.
We present the first BeppoSAX observation (0.1 to 220 keV) of the quasar Mrk 205. We have searched for the unusual Fe line profile claimed in the XMM-Newton spectrum which has been widely discussed...
Quasar jet emission model applied to the microquasar GRS 1915+105 (2004)
Turler, M., Courvoisier, T. J. -L., Chaty, S., Fuchs, Y.
The true nature of the radio emitting material observed to be moving relativistically in quasars and microquasars is still unclear. The microquasar community usually interprets them as distinct...
Time resolved spectroscopy of GRB030501 using INTEGRAL (2004)
Beckmann, V., Borkowski, J., Courvoisier, T. J.-L., Götz, D., Favre, P., Hudec, R., ...
INTEGRAL-RXTE observations of Cygnus X-1 (2004)
Pottschmidt, K., Wilms, J., Nowak, M. A., Dubath, P., Kreykenbohm, I., Gleissner, T., ...
Scientific performance of the ISDC quick look analysis (2004)
Shaw, S. E., Mowlavi, N., Ebisawa, K., Paizis, A., Rodriguez, J., Zurita, J., ...
INTEGRAL/RXTE observations of Cygnus X-1 (2004)
Wilms, J., Pottschmidt, K., Nowak, M. A., Chernyakova, M., Rodriguez, J., Zdziarski, A. A., ...
XMM-Newton Observations of the Ultraluminous Nuclear X-ray Source in M33 (2003)
Foschini, L., Rodriguez, J., Fuchs, Y., Ho, L. C., Dadina, M., Di Cocco, G., ...
We present observations with XMM-Newton of M33 X-8, the ultraluminous X-ray source (L_{0.5-10 keV} ~ 2x10^39 erg/s) closest to the centre of the galaxy. The best-fit model is similar to the typical...
INTEGRAL timing and localization performance (2003)
Walter, R., Favre, P., Dubath, P., Domingo, A., Gienger, G., Hermsen, W., ...
In this letter we report on the accuracy of the attitude, misalignment, orbit and time correlation which are used to perform scientific analyses of the INTEGRAL data. The boresight attitude during...
INTEGRAL discovery of a bright highly obscured galactic X-ray binary source IGR J16318-4848 (2003)
Walter, R., Rodriguez, J., Foschini, L., De Plaa, J., Corbel, S., Courvoisier, T. J. -L., ...
INTEGRAL regularly scans the Galactic plane to search for new objects and in particular for absorbed sources with the bulk of their emission above 10-20 keV. The first new INTEGRAL source was...
High-Energy sources before INTEGRAL -- INTEGRAL reference catalog -- (2003)
Ebisawa, Ken, Bourban, G., Bodaghee, A., Mowlavi, N., Courvoisier, T. J. -L.
We describe the INTEGRAL reference catalog which classifies previously known bright X-ray and gamma-ray sources before the launch of INTEGRAL. These sources are, or have been at least once, brighter...
First INTEGRAL observations of Cygnus X-3 (2003)
Vilhu, O., Hjalmarsdotter, L., Zdziarski, A. A., Paizis, A., McCollough, M. L., Beckmann, V., ...
We present the first INTEGRAL results on Cyg X-3 from the PV phase observations of the Cygnus region. The source was clearly detected by the JEM-X, ISGRI and SPI detectors. The INTEGRAL observations...
Simultaneous observations of the quasar 3C 273 with INTEGRAL, XMM-Newton and RXTE (2003)
Courvoisier, T. J. -L., Beckmann, V., Bourban, G., Chenevez, J., Chernyakova, M., Deluit, S., ...
INTEGRAL has observed the bright quasar 3C 273 on 3 epochs in January 2003 as one of the first observations of the open programme. The observation on January 5 was simultaneous with RXTE and...
First INTEGRAL Observations of Eight Persistent Neutron Star Low Mass X-ray Binaries (2003)
Paizis, A., Beckmann, V., Courvoisier, T. J. -L., Vilhu, O., Lutovinov, A., Ebisawa, K., ...
Early results from the INTEGRAL Core Program, for a sample of eight persistently bright neutron star low mass X-ray binaries in the energy range from 5 keV to 200 keV are presented. It is shown that...
The INTEGRAL Science Data Centre (ISDC) (2003)
Courvoisier, T. J. -L., Walter, R., Beckmann, V., Dean, A. J., Dubath, P., Hudec, R., ...
The INTEGRAL Science Data Centre (ISDC) provides the INTEGRAL data and means to analyse them to the scientific community. The ISDC runs a gamma ray burst alert system that provides the position of...
The Peculiar X-ray Transient IGR 16358-4726 (2003)
Patel, S. K., Kouveliotou, C., Tennant, A., Woods, P. M., King, A., Ubertini, P., ...
The new transient IGR 16358-4726 was discovered on 2003 March 19 with INTEGRAL. We detected the source serendipitously during our 2003 March 24 observation of SGR 1627-41 with the Chandra X-ray...