Search Publications
Missions
Journals
Publication Years
Detection of the southern counterpart of the Jovian northern polar cusp: Shared properties
Prangé, Renée; Pallier, Laurent
A transient auroral feature in the northern (N) polar region of Jupiter, referred to as an `auroral flare' [Waite et al., 2001], or as the N polar cusp [Pallier and Prangé, 2001], strangely seemed to lack any southern (S) counterpart. Here, using a new HST/STIS dataset, we find a similar bright spot in the south. We suggest that both features are …
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…
XMM-Newton observations of 3C 273
Done, C.; O'Brien, P. T.; Reeves, J. N. +4 more
A series of nine XMM-Newton observations of the radio-loud quasar 3C 273 are presented, concentrating mainly on the soft excess. Although most of the individual observations do not show evidence for iron emission, co-adding them reveals a weak, broad line (EW ~56 eV). The soft excess component is found to vary, confirming previous work, and can be…
A comparison of wave mode identification techniques
Belmont, G.; André, M.; Sahraoui, F. +6 more
Available from http://www.copernicus.org/site/EGU/annales/22/8/3021.htm?FrameEngine=false;
Energetic particle observations in the vicinity of Jupiter: Cassini MIMI/LEMMS results
Livi, S.; Krupp, N.; Woch, J. +7 more
We report on energetic particle measurements from the Low Energy Magnetospheric Measurement System (LEMMS) on board the Cassini spacecraft during the Jupiter flyby (October 2000 to April 2001). Cassini passed Jupiter on its way to Saturn on the dusk flank of the magnetosphere and explored for the first time the dusk-to-midnight magnetosheath of th…
Complex X-ray spectral behaviour of NGC 4051 in the low flux state
Page, M. J.; Uttley, P.; Mason, K. O. +4 more
The narrow-line Seyfert 1 galaxy, NGC 4051, was observed in one of its prolonged low flux states by XMM-Newton in 2002 November. Here we present the results of an analysis of the European Photon Imaging Camera (EPIC) pn data obtained during the observation. Within the low state, the source shows complex spectral variability which cannot easily be …
Discovery of a Transient U-Band Dropout in a Lyman Break Survey: A Tidally Disrupted Star at z=3.3?
Kneib, J. -P.; Bloom, J. S.; Frail, D. A. +8 more
We report the discovery of a transient source in the central regions of galaxy cluster A267. The object, which we call ``PALS-1,'' was found in a survey aimed at identifying highly magnified Lyman break galaxies in the fields of intervening rich clusters. At discovery, the source had Un>24.7 (2 σ AB), g=21.96+/-0.12, and very blue g-…
The XMM-Newton/2dF survey - II. The nature of X-ray-faint optically bright X-ray sources
Georgakakis, A.; Georgantopoulos, I.; Plionis, M. +6 more
In this paper we investigate the properties of low X-ray-to-optical flux ratio sources detected in a wide-area (2.5 deg2) shallow [fX(0.5-8 keV) ~ 10-14 erg s-1 cm-2]XMM-Newton survey. We find a total of 26 sources (5 per cent of the total X-ray-selected population) with log fX/f
A statistical study of oxygen freezing-in temperature and energetic particles inside magnetic clouds observed by Ulysses
Krupp, N.; Woch, J.; Rodriguez, L. +5 more
Interplanetary Coronal Mass Ejections (ICMEs) have proven to be very complex phenomena, not easy to unveil using a single set of observations. We combine Ulysses observations of medium energy particles, solar wind plasma parameters, magnetic field, and charge state distributions of heavy ions in order to identify and characterize CME ejecta in the…
Triple cusps observed by Cluster-Temporal or spatial effect?
Balogh, A.; Glassmeier, K. -H.; Zhang, H. +6 more
On April 18, 2002, the Cluster spacecraft were outbound in the northern hemisphere over the pole and entered the cusp. A cusp-like region was observed consecutively three times from 1620 to 1830 UT by all four Cluster Spacecraft although the solar wind dynamic pressure was small and stable. All three cusp encounters were characterized by turbulent…