349 citations · 2.8k across the 42 of their papers we have counts for
10 papers · 1 filter
Very high energy gamma-ray observations of the galaxy clusters Abell 496 and Abell 85 with H.E.S.S
H. E. S. S. Collaboration, :, F. Aharonian
Aims: The nearby galaxy clusters Abell 496 and Abell 85 are studied in the very high energy (VHE, E > 100 GeV) band to investigate VHE cosmic rays (CRs) in this class of objects wh…
Serendipitous discovery of the unidentified extended TeV gamma-ray source HESS J1303-631
H. E. S. S. Collaboration, :, F. Aharonian
The serendipitous discovery of an unidentified extended TeVgamma-ray source close to the galactic plane named HESS J1303-631 at a significance of 21 standard deviations is reported…
Radio and X-ray observations during the outburst decay of the Black Hole Candidate XTE J1908+094
P. G. Jonker, E. Gallo, V. Dhawan +3
Obtaining simultaneous radio and X-ray data during the outburst decay of soft X-ray transients is a potentially important tool to study the disc - jet connection. Here we report re…
Excess mid-IR emission in Cataclysmic Variables
G. Dubus, R. Campbell, B. Kern +2
We present a search for excess mid-IR emission due to circumbinary material in the orbital plane of cataclysmic variables (CVs). Our motivation stems from the fact that the strong…
VLT spectroscopy of XTE J2123-058 during quiescence
J. Casares, G. Dubus, T. Shahbaz +2
We present VLT low resolution spectroscopy of the neutron star X-ray transient XTE J2123-058 during its quiescent state. Our data reveal the presence of a K7V companion which contr…
The disc instability model for X-ray transients: evidence for truncation and irradiation
G. Dubus, J. -M. Hameury, J. -P. Lasota
We study the prospect of explaining the outbursts of Soft X-ray Transients (SXTs) by the thermal-viscous instability in a thin disc. This instability is linked to hydrogen ionizati…
BeppoSAX spectroscopy of the luminous X-ray sources in M33
A. N. Parmar, L. Sidoli, T. Oosterbroek +6
The nearby galaxy M33 was observed by the imaging X-ray instruments on-board BeppoSAX. Two observations at different phases of the 105.9 day intensity cycle of the luminous central…
Precessing warped accretion discs in X-ray binaries
G. I. Ogilvie, G. Dubus
We study the radiation-driven warping of accretion discs in the context of X-ray binaries. The latest evolutionary equations are adopted, which extend the classical alpha theory to…
X-ray irradiation in low mass binary systems
G. Dubus, J. -P. Lasota, J. -M. Hameury +1
We calculate self-consistent models of X-ray irradiated accretion discs in close binary systems. We show that a point X-ray source powered by accretion and located in the disc plan…
Hot white dwarfs and the UV delay in dwarf novae
J. -M. Hameury, J. -P. Lasota, G. Dubus
We calculate the effect of illumination of dwarf nova accretion discs by radiation from a hot, central, white dwarf. We show that only for very hot white dwarfs (Teff ~ 40 000$ K)…