Search Publications
Sicily 2002 balloon campaign: a test of the HASI instrument
Fulchignoni, M.; Colombatti, G.; Ferri, F. +9 more
A mock-up of the probe descending in the Titan atmosphere as part of the Huygens Cassini Mission was successfully launched and recovered on 30th May 2002 after a stratospheric balloon launch from the Italian Space Agency Base "Luigi Broglio" in Trapani, Sicily. To simulate the Huygens mission at Titan, the probe was lifted to an altitude of 32 km …
Deep surveys of the obscured universe: GOODS
Chatzichristou, E. T.; Goods Team
Astronomy in the next decade will be dominated by multi-wavelength surveys which address a wide variety of scientific issues including galaxy formation and evolution, AGN structure and demographics and galactic structure. The great observatories origins deep survey (GOODS) is a deep multi-wavelength public survey of two of the deepest fields ever …
Dust production in supernovae
Dunne, L.; Eales, S.; Ivison, R. +2 more
The question `Are supernovae important sources of dust?' is a contentious one. Condensation theory and observations of dust at very high redshifts suggests that they should be, since only massive stars evolve quickly enough to produce the large quantities of dust seen at such early times in the Universe. However, observations with IRAS and ISO hav…
Sgr A East and its surroundings observed in X-rays
Decourchelle, A.; Warwick, R. S.; Sakano, M.
We report the results of an XMM-Newton observation of Sgr A East and its surroundings. The X-ray spectrum of Sgr A East is well represented with a two-temperature plasma model with temperatures of ∼1 and ∼4 keV. Only the iron abundance shows clear spatial variation; it concentrates in the core of Sgr A East. The derived plasma parameters suggest t…
Far Ultraviolet Spectroscopic Explorer Observations of the Dwarf Nova SW Ursae Majoris during Quiescence
Raymond, J. C.; Lobel, A.; Menou, K. +1 more
We present spectroscopic observations of the short-period cataclysmic variable SW UMa obtained by the Far Ultraviolet Spectroscopic Explorer (FUSE) satellite while the system was in quiescence. The data include the resonance lines of O VI at 1031.91 and 1037.61 Å. These lines are present in emission, and they exhibit both narrow (~150 km s-1<…
HST and VLT observations of isolated neutron stars
Caraveo, P. A.; de Luca, A.; Mignani, R. P. +1 more
New results of optical observations of isolated pulsars and their environments are presented. Very Large Telescopes observations of PSR J0108-1431 set an upper limit of B~=28.6 on its optical flux, implying a neutron star surface temperature T<8.8×104 K (for d=200 pc, R∞=13 km). HST proper motion measurement of the PSR 192…
XMM-Newton study of soft excess X-ray emission in clusters of galaxies
Kaastra, J. S.; Tamura, T.; den Herder, J. W. +2 more
We discuss the detection of soft excess X-ray emission in a sample of 19 clusters of galaxies observed by XMM-Newton. In 6/19 clusters evidence for a soft X-ray excess is found. Four of these clusters show soft X-ray and O VII line emission from gas with a temperature of ∼0.2 keV. The centroid of this oxygen line is consistent with the redshift of…
Real time localization of gamma ray bursts with INTEGRAL
Götz, D.; Mereghetti, S.; Borkowski, J.
The INTEGRAL satellite has been successfully launched in October 2002 and has recently started its operational phase. The INTEGRAL burst alert system (IBAS) will distribute in real time the coordinates of the gamma ray bursts (GRBs) detected with INTEGRAL. After a brief introduction on the INTEGRAL instruments, we describe the main IBAS characteri…
Repetitive X-line Hall current structures over the dawnside ionosphere induced by successive exo-magnetosphere pressure pulses
Sarafopoulos, D.
This work is a synthesis of observational and magnetosphere model produced results. In the first place, we observe geographic latitude-dependent delays in signature arrival times at dawnside ground magnetograms. We use the IMAGE chain ground station magnetograms associated with in-situ observations obtained from the Wind, ACE, IMP-8, LANL 97A and …
Suprathermal ions of solar and interstellar origin associated with the April 9-12, 2001, CMEs
Klecker, B.; Wimmer-Schweingruber, R. F.; Hilchenbach, M. +2 more
The distribution functions of suprathermal ions associated with the two interplanetary coronal mass ejections in the time period of April 9-12, 2001, are analyzed. The data on ions in the energy range 35-2000 keV/amu were recorded by the (Highly) Suprathermal Time-of-Flight (HSTOF/STOF) Spectrometer on board the Solar and Heliospheric Observatory …