Simulating acceleration and radiation processes in X-ray binaries (2008)
Belmont, R., Malzac, J., Marcowith, A.
The high energy emission of microquasars is thought to originate from high energy particles. Depending on the spectral state, the distribution of these particles can be thermal with a high...
Radiation processes around accreting black holes (2008)
Belmont, R., Malzac, J., Marcowith, A.
Accreting sources such as AGN, X-ray binaries or gamma-ray bursts are known to be strong, high energy emitters. The hard emission is though to originate from plasmas of thermal and/or non-thermal...
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...
A model of the TeV flare of Cygnus X-1: electron acceleration and extended pair cascades (2008)
Zdziarski, A. A., Malzac, J., Bednarek, W.
We consider theoretical models of emission of TeV photons by Cyg X-1 during a flare discovered by the MAGIC detector. We study acceleration of electrons to energies sufficient for TeV emission, and...
Simulating radiation and kinetic processes in relativistic plasmas (2008)
Belmont, R., Malzac, J., Marcowith, A.
Modelling the emission properties of compact high energy sources such as X-ray binaries, AGN or gamma-ray bursts represents a complex problem. Contributions of numerous processes participate non...
Spectral variability of GX 339-4 in a hard-to-soft state transition (2008)
Del Santo, M., Malzac, J., Jourdain, E., Belloni, T., Ubertini, P.
We report on INTEGRAL observations of the bright black-hole transient GX 339-4 performed during the period August-September 2004. Our data cover three different spectral states, namely...
Malzac, J., Lubinski, P., Zdziarski, A. A., Bel, M. Cadolle, Turler, M., Laurent, P.
We present INTEGRAL light curves and spectra of the black-hole binary Cyg X-1 during a bright event that occurred in 2006 September, and which was simultaneous with a detection at 0.15-1 TeV energies...
A new code for radiation processes in high energy plasmas (2008)
Belmont, R., Malzac, J., Marcowith, A.
Extreme objects such as X-ray binaries, AGN, or $\gamma$-ray bursters harbor high energy plasmas whose properties are not well understood yet. Not only are they responsible of the hard X- and...
Constraints on light bending and reflection from the hard X-ray background (2007)
Gandhi, P., Fabian, A. C., Suebsuwong, T., Malzac, J., Miniutti, G., Wilman, R. J.
Light bending due to strong gravity has recently been invoked to explain variability and flux correlations between different bands in some accreting black holes. A characteristic feature of light...
Unveiling the broad band X-ray continuum and iron line complex in Mkr 841 (2007)
Petrucci, P.O., Ponti, G., Matt, G., Longinotti, A. L., Malzac, J., Mouchet, M., ...
Mkr 841 is a bright Seyfert 1 galaxy known to harbor a strong soft excess and a variable K$\alpha$ iron line. It has been observed during 3 different periods by XMM for a total cumulated exposure...
Bimodal spectral variability of Cygnus X-1 in an intermediate state (2007)
Malzac, J., Petrucci, P.O., Jourdain, E., Cadolle Bel, M., Sizun, P., Pooley, G., ...
We report the results of an observation of Cygnus X-1 with INTEGRAL, that we combine with simultaneous radio observations with the Ryle telescope. Both spectral and variability properties of the...
Bimodal spectral variability of Cygnus X-1 in an intermediate state (2007)
Malzac, J., Petrucci, P.O., Jourdain, E., Cadolle Bel, M., Sizun, P., Pooley, G., ...
We report the results of an observation of Cygnus X-1 with INTEGRAL, that we combine with simultaneous radio observations with the Ryle telescope. Both spectral and variability properties of the...
Bimodal spectral variability of Cygnus X-1 in an intermediate state (2007)
Malzac, J., Petrucci, P.O., Jourdain, E., Cadolle Bel, M., Sizun, P., Pooley, G., ...
We report the results of an observation of Cygnus X-1 with INTEGRAL, that we combine with simultaneous radio observations with the Ryle telescope. Both spectral and variability properties of the...
Unveiling the broad band X-ray continuum and iron line complex in Mkr 841 (2007)
Petrucci, P. O., Ponti, G., Matt, G., Longinotti, A. L., Malzac, J., Mouchet, M., ...
Mkr 841 is a bright Seyfert 1 galaxy known to harbor a strong soft excess and a variable K$\alpha$ iron line. It has been observed during 3 different periods by XMM for a total cumulated exposure...
The origin of the strong soft excess and puzzling iron line complex in Mkn 841 (2006)
Petrucci, P. O., Ponti, G., Matt, G., Maraschi, L., Malzac, J., Mouchet, M., ...
Mkn 841 has been observed during 3 different periods (January 2001, January 2005 and July 2005) by XMM-Newton for a total cumulated exposure time of ~108 ks. We present in this paper a broad band...
Spectral variability modes of GX 339-4 in a hard-to-soft state transition (2006)
Del Santo, M., Malzac, J., Ubertini, P., Belloni, T.
We report on INTEGRAL observations performed during the 2004 outburst of the bright black hole transient GX 339-4. We analysed IBIS and JEM-X public data starting on 9th August and lasting about one...
Hard X-ray emission of the microquasar GX 339-4 in the low/hard state (2006)
Joinet, A., Jourdain, E., Malzac, J., Roques, J. P., Corbel, S., Rodriguez, J., ...
We present the analysis of the high energy emission of the Galactic black hole binary GX 339-4 in a low/hard state at the beginning of its 2004 outburst. The data from 273 ks of INTEGRAL...
On the X-ray spectra of luminous, inhomogeneous accretion flows (2006)
Merloni, A., Malzac, J., Fabian, A. C., Ross, R. R.
We discuss the expected X-ray spectral and variability properties of black hole accretion discs at high luminosity, under the hypothesis that radiation pressure dominated discs are subject to violent...
Gravitational effects on the high energy emission of accreting black holes (2006)
Suebsuwong, T., Malzac, J., Jourdain, E., Marcowith, A.
We extend the investigation of general relativistic effects on the observed X-ray continuum of Kerr black holes in the context of the light bending model (Miniutti & Fabian, 2004). Assuming a...
The broad-band spectrum of Cygnus X-1 measured by INTEGRAL (2006)
Cadolle Bel, M., Sizun, P., Goldwurm, A., Rodriguez, J., Laurent, P., Zdziarski, A.A., ...
The INTEGRAL satellite extensively observed the black hole binary Cygnus X-1 from 2002 November to 2004 November during calibration, open time and core program (Galactic Plane Scan) observations....
The broad-band spectrum of Cygnus X-1 measured by INTEGRAL (2006)
Cadolle Bel, M., Sizun, P., Goldwurm, A., Rodriguez, J., Laurent, P., Zdziarski, A.A., ...
The INTEGRAL satellite extensively observed the black hole binary Cygnus X-1 from 2002 November to 2004 November during calibration, open time and core program (Galactic Plane Scan) observations....
The broad-band spectrum of Cygnus X-1 measured by INTEGRAL (2006)
Cadolle Bel, M., Sizun, P., Goldwurm, A., Rodriguez, J., Laurent, P., Zdziarski, A.A., ...
The INTEGRAL satellite extensively observed the black hole binary Cygnus X-1 from 2002 November to 2004 November during calibration, open time and core program (Galactic Plane Scan) observations....
Bimodal spectral variability of Cygnus X-1 in an intermediate state (2005)
Malzac, J., Petrucci, P. O., Jourdain, E., Cadolle, M., Sizun, P., Pooley, G., ...
We report the results of an observation of Cygnus X-1 with INTEGRAL, that we combine with simultaneous radio observations with the Ryle telescope. Both spectral and variability properties of the...
The broad-band spectrum of Cygnus X-1 measured by INTEGRAL (2005)
Bel, M. Cadolle, Sizun, P., Goldwurm, A., Rodriguez, J., Laurent, P., Zdziarski, A. A., ...
The INTEGRAL satellite extensively observed the black hole binary Cygnus X-1 from 2002 November to 2004 November during calibration, open time and core program (Galactic Plane Scan) observations....
The High Energy Spectrum of NGC 4151 (2005)
Beckmann, V., Shrader, C. R., Gehrels, N., Soldi, S., Lubinski, P., Zdziarski, A. A., ...
We present the first INTEGRAL observations of the type 1.5 Seyfert galaxy NGC 4151. Combining several INTEGRAL observations performed during 2003, totaling about 400 ks of exposure time, allows us to...
Joinet, A., Jourdain, E., Malzac, J., Roques, J. P., Schoenfelder, V., Ubertini, P., ...
IGR J17464-3213, already known as the HEAO-1 transient source H1743-322, has been detected during a state transition by the SPI/INTEGRAL telescope. We describe the spectral evolution and flaring...
Bimodal spectral variability of Cygnus X-1 in an intermediate state (2005)
Malzac, J., Petrucci, P.O., Jourdain, E., Cadolle Bel, M., Sizun, P., Pooley, G., ...
We report the results of an observation of Cygnus X-1 with INTEGRAL, that we combine with simultaneous radio observations with the Ryle telescope. Both spectral and variability properties of the...
Bimodal spectral variability of Cygnus X-1 in an intermediate state (2005)
Malzac, J., Petrucci, P.O., Jourdain, E., Cadolle Bel, M., Sizun, P., Pooley, G., ...
We report the results of an observation of Cygnus X-1 with INTEGRAL, that we combine with simultaneous radio observations with the Ryle telescope. Both spectral and variability properties of the...
State transition and flaring activity of IGR J17464-3213/H1743-322 with INTEGRAL SPI (2005)
Joinet, A., Jourdain, E., Malzac, J., Roques, J. P., Schönfelder, V., Ubertini, P., ...
Integral observation of Cyg X-1 in an intermediate state (2004)
Malzac, J., Petrucci, P. O., Jourdain, E., Sizun, P., Cadolle, M., Pooley, G., ...
We present preliminary results of an observation of Cygnus X-1 with INTEGRAL performed on June 7-11 2003. Both spectral and variability properties of the source indicate that Cygnus X-1 was in an...
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...
Chaty, S., Haswell, C.A., Malzac, J., Hynes, R.I., Shrader, C.R., Cui, W.
We report multiwavelength observations of the soft X-ray transient XTE J1118+480, which we observed with UKIRT, Hubble Space Telescope (HST), RXTE, Extreme Ultraviolet Explorer (EUVE) and many other...
Chaty, S., Haswell, C. A., Malzac, J., Hynes, R. I., Shrader, C. R., Cui, W.
We report multiwavelength observations of the soft X-ray transient (SXT) XTE J1118+480, which we observed with UKIRT, HST, RXTE, EUVE and many other instruments and facilities. Adding radio (Ryle...
The optical and X-ray flickering of XTE J1118+480 (2003)
Malzac, J., Belloni, T., Spruit, H. C., Kanbach, G.
We use both time-domain and Fourier techniques to study the correlated optical and X-rays variability in the black hole X-ray nova XTE J1118+480. Its X-ray timing properties, such as the shape of the...
Chaty, S., Haswell, C. A., Malzac, J., Hynes, R. I., Shrader, C. R., Cui, W.
We report multiwavelength observations of the soft X-ray transient XTE J1118 + 480, which we observed with UKIRT, Hubble Space Telescope (HST), RXTE, Extreme Ultraviolet Explorer (EUVE) and many...
Reflection at large distance from the central engine in Seyferts (2001)
We consider the possibility that most of the reflection component, observed in the hard X-ray spectra of Seyfert galaxies, could be formed on an extended medium, at large distance from the central...
Testing Comptonisation models using BeppoSAX observations of Seyfert 1 galaxies (2001)
Petrucci, P. O., Haardt, F., Maraschi, L., Grandi, P., Malzac, J., Matt, G., ...
We have used realistic Comptonization models to fit high quality BeppoSAX data of 6 Seyfert galaxies. Our main effort was to adopt a Comptonization model taking into account the anisotropy of the...
Testing Comptonization models using BeppoSAX observations of Seyfert 1 galaxies (2001)
Petrucci, P. O., Haardt, F., Maraschi, L., Grandi, P., Malzac, J., Matt, G., ...
We used high quality BeppoSAX data of 6 Seyfert galaxies to test realistic thermal Comptonization models. Our main effort was to adopt a Comptonization model taking into account the anisotropy of the...
Malzac, J., Jourdain, E., Petrucci, P. O., Henri, G.
We calculate the reflection component predicted by the anisotropic illumination model of Henri & Petrucci 1997. This component appears to be more important than for isotropic models. The overall...
SIGMA observations of X-ray Nova Velorum 1993 (GRS 1009-45) (1997)
Goldoni, P., Vargas, M., Goldwurm, A., Laurent, P., Jourdain, E., ...
We report on hard X-ray observations of X-ray Nova Velorum 1993 (GRS 1009-45) performed with the SIGMA coded mask X-ray telescope in January 1994. The source was clearly detected with a flux of about...
An Anisotropic Illumination Model of Seyfert I Galaxies (1997)
Petrucci, P. O., Henri, G., Malzac, J., Jourdain, E.
We develop a self-consistent model of Seyfert galaxies continuum emission. High energy emission is produced by Inverse Compton process on soft photons emitted as thermal radiation by the accretion...