Search Publications
Late evolution of the X-ray afterglow of GRB 030329
Ghirlanda, G.; Ghisellini, G.; Tiengo, A. +2 more
The X-ray afterglow of the Gamma-Ray Burst GRB 030329, associated with SN2003dh at z= 0.1685, has been observed with XMM-Newton 258 days after the burst explosion. A source with a flux of (6.2 ± 2.3) × 10-16 erg cm-2 s-1 (0.5-2 keV) has been detected at the GRB position. This measurement, together with a re-analysi…
Molecular and ionized gas in the tidal tail in Stephan's Quintet
Duc, P. -A.; Braine, J.; Charmandaris, V. +3 more
We have mapped with the IRAM interferometer at Plateau de Bure (PdBI) the 12CO emission towards intergalactic star forming regions located in the tidal tail stemming from NGC 7319, in the Stephan's Quintet compact group of galaxies. The 13CO emission of the same region was observed with the IRAM 30 m telescope and optical spe…
XMM-Newton observations of the ultraluminous nuclear X-ray source in M 33
Rodriguez, J.; Foschini, L.; Ho, L. C. +5 more
We present observations with XMM-Newton of M 33 X-8, the ultraluminous X-ray source (L0.5-10 keV ≈ 2× 1039 erg/s) closest to the centre of the galaxy. The best-fit model is similar to the typical model of Galactic black holes in very high state. Comparison with previous observations indicates that the source is still in a ver…
Circumstellar dust shells of hot post-AGB stars
Parthasarathy, M.; Gauba, G.
Parameters of the circumstellar dust shells of 15 hot post-AGB stars have been derived using a radiative transfer code (DUSTY). Combining the optical, near and far-infrared (ISO, IRAS) data of the stars, we have reconstructed their spectral energy distributions (SEDs) and estimated the dust temperatures, mass loss rates, angular radii of the inner…
Solar cycle dependence of the helium focusing cone from SOHO/UVCS observations. Electron impact rates and associated pickup ions
Bertaux, J. -L.; Raymond, J. C.; Uzzo, M. +5 more
The Ultraviolet Coronograph on board SOHO (UVCS) has observed the 58.4 nm glow of the interplanetary He focusing cone at regular intervals since 1996. The intensity decrease with time already observed during the first two years (Michels et al. \cite{michels}) has dramatically amplified during the solar activity increase. Intensities seem to reach …
On the Wolf-Rayet counterpart to IC 10 X-1
Crowther, P. A.; Clark, J. S.
Recent CHANDRA observations of the starburst galaxy
Spectral evolution of weak bursts from SGR 1806-20 observed with INTEGRAL
Hurley, K.; Götz, D.; Mereghetti, S. +1 more
We report on bursts from the Soft Gamma-Ray Repeater SGR 1806-20 detected with INTEGRAL in October 2003, during a period of moderate activity of the source. The spectral and temporal properties of 21 short bursts are consistent with those found in previous observations, even if these bursts are among the faintest observed in the 15-200 keV range f…
Studies of orbital parameters and pulse profile of the accreting millisecond pulsar XTE J1807-294
Freyberg, M. J.; Kendziorra, E.; Smith, M. J. S. +4 more
The accreting millisecond pulsar XTE J1807-294 was observed as a Target of Opportunity (ToO) by XMM-Newton on March 22, 2003 after its discovery on February 21, 2003 by RXTE. The source was detected in its bright phase with an observed average count rate of 33.3 cts s-1 in the EPIC-pn camera in the 0.5-10 keV energy band (3.7 mCrab). Us…
Dynamical mass estimates for two luminous young stellar clusters in Messier 83
Larsen, S. S.; Richtler, T.
Using new data from the UVES spectrograph on the ESO Very Large Telescope and archive images from the Hubble Space Telescope, we have measured projected velocity dispersions and structural parameters for two bright young star clusters in the nearby spiral galaxy
Visible spectral properties of asteroid 21 Lutetia, target of Rosetta Mission
Barbieri, C.; Lazzarin, M.; Marchi, S. +1 more
Rosetta spacecraft was successfully launched on March 2nd 2004 after its launch postponement in January 2003. Owing to this delay all the original targets, comet and asteroids, have been changed. In particular, on its 10 years journey to the new comet 67P/Churyumov-Gerasimenko, the spacecraft will pass close to the asteroid 21 Lutetia. In this pap…