Search Publications
Gamma-rays from the vicinity of accreting neutron stars inside compact high-mass X-ray binaries
Bednarek, W.
The dense wind of a massive star can be captured partially by a neutron star (NS) inside a compact binary system. Depending on the parameters of the NS and the wind, the matter can penetrate the inner NS magnetosphere. At some distance from the NS, a turbulent and magnetized transition region is formed due to the balance between the magnetic press…
Solar source of energetic particles in interplanetary space during the 2006 December 13 event
Vial, J. -C.; Fazakerley, A. N.; Owen, C. J. +5 more
An X3.4 solar flare and a fast halo coronal mass ejection (CME) occurred on 2006 December 13, accompanied by a high flux of energetic particles recorded both in near-Earth space and at ground level. Our purpose is to provide evidence of flare acceleration in a major solar energetic particle (SEP) event. We first present observations from ACE/EPAM,…
An ISO/SWS study of the dust composition around S stars. A novel view of S-star dust
Heras, A. M.; Hony, S.; Molster, F. J. +1 more
Aims: We investigate the composition of the solid-state materials in the winds around S-type AGB stars. The S stars produce dust in their wind that bears a resemblance to the dust produced in some O-rich AGB stars. However, the reported resemblance is mostly based on IRAS/LRS spectra with limited spectral resolution, sensitivity, and wavelength co…
Properties of the ionised plasma in the vicinity of the neutron-star X-ray binary EXO 0748-676
Costantini, E.; Méndez, M.; Paerels, F. B. S. +2 more
Aims: We present the spectral analysis of a large set of XMM-Newton observations of EXO 0748-676, a bright dipping low-mass X-ray binary. In particular, we focus on the dipping phenomenon as a result of changes in the properties of the ionised gas close to the source.
Methods: We analysed the high-resolution spectra collected with the reflecti…
Lithium and magnetic fields in giant stars. HD 232 862: a magnetic and lithium-rich giant
de Laverny, P.; de Medeiros, J. R.; Palacios, A. +5 more
Aims: We report the detection of an unusually high lithium content in HD 232 862, a field giant classified as a G8II star, and hosting a magnetic field.
Methods: With the spectropolarimeters ESPaDOnS at CFHT and NARVAL at TBL, we collected high resolution and high signal-to-noise spectra of three giants: HD 232 862, KU Peg and HD 21 018. From …
A Suzaku observation of the ULIRG IRAS19254-7245: discerning the AGN component
Ptak, A.; Reeves, J. N.; Braito, V. +3 more
We discuss a long Suzaku observation of IRAS 19254-7245 (also known as the Superantennae), one of the brightest and well studied Ultra Luminous Infrared Galaxies in the local Universe. This long observation provided the first detection of IRAS 19254-7245 above 10 keV, and a measurement of a 15-30 keV flux of ~5× 10-12 erg cm-2
The early phase of a H1743-322 outburst observed by INTEGRAL, RXTE, Swift, and XMM/Newton
Rodriguez, J.; Wilms, J.; Cadolle Bel, M. +7 more
Aims: We investigate the early phase of the first state change during the 2008 September-November outburst of H1743-322, first detected by the INTEGRAL satellite. We focus on the preliminary hard X-ray state with the aim of investigating the possible influence of this phase on the subsequent evolution during the outburst.
Methods: The outburst…
A surviving disk from a galaxy collision at z = 0.4
Yang, Y.; Flores, H.; Hammer, F. +2 more
Context: Spiral galaxies dominate the local galaxy population. Disks are known to be fragile to collisions. Thus it is worthwhile to probe under what conditions a disk can possibly survive such interactions.
Aims: We present a detailed morpho-kinematic study of a massive galaxy with two nuclei,
Detailed radio to soft γ-ray studies of the 2005 outburst of the new X-ray transient XTE J1818-245
D'Avanzo, P.; Campana, S.; Goldoni, P. +11 more
Context: XTE J1818-245 is an X-ray nova that experienced an outburst in 2005, as first seen by the <sl>RXTE</sl> satellite. The source was observed simultaneously at various wavelengths up to soft γ-rays with the <sl>INTEGRAL</sl> satellite, from 2005 February to September, during our <sl>INTEGRAL</sl> Target of…
The AGN nature of three INTEGRAL sources: IGR J18249-3243, IGR J19443+2117, and IGR J22292+6647
Masetti, N.; Gehrels, N.; Capitanio, F. +6 more
Context: The third INTEGRAL/IBIS survey has revealed several new hard X-ray sources, which are still unidentified or unclassified. To identify these sources, we need to find their counterparts at other wavelengths and then study their nature.
Aims: The aim of this work is to employ the capability of the X-ray telescope (XRT) onboard Swift to l…