Search Publications
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…
Persistent North-South Alignment of the Solar Supergranulation
Toomre, Juri; Lisle, Jason P.; Rast, Mark P.
We have found evidence of an alignment of the solar supergranulation in the direction parallel to the Sun's rotation axis. Signatures of the alignment are apparent in both time-averaged images and in three-dimensional power spectra. The north-south organization is persistent in time, extending over many supergranular lifetimes. It occurs over a wi…
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 …
The Unusual Tidal Dwarf Candidate in the Merger System NGC 3227/3226: Star Formation in a Tidal Shock?
Forbes, Duncan A.; Schinnerer, Eva; Mundell, Carole G. +2 more
We report the discovery of active star formation in the H I cloud associated with the interacting Seyfert system NGC 3227/3226 that was originally identified as a candidate tidal dwarf galaxy (TDG) by Mundell et al. and that we name J1023+1952. We present broadband optical B, R, I (from the Isaac Newton Telescope), and ultraviolet images (from XMM…
Bow shock specularly reflected ions in the presence of low-frequency electromagnetic waves: a case study
Lundin, R.; Balogh, A.; Dandouras, I. +14 more
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