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FUSE Spectroscopy of the Large Magellanic Cloud Supernova Remnant N49
Blair, William P.; Raymond, John C.; Sankrit, Ravi
Strong C III λ977 and O VI λλ1032, 1038 emission lines are detected in Far Ultraviolet Spectroscopic Explorer (FUSE) spectra of N49, the brightest optical supernova remnant in the Large Magellanic Cloud. Shocks with velocities ranging from less than 130 to more than 180 km s-1 are responsible for these emission lines and are present ove…
Correlation between suprathermal electron bursts, broadband extremely low frequency waves, and local ion heating in the midaltitude cleft/low-latitude boundary layer observed by Cluster
Balogh, A.; RèMe, H.; Fazakerley, A. N. +9 more
The Cluster spacecraft often cross the midaltitude cleft/cusp and observe a very well defined "electron-only cleft" region consisting of electron injections without magnetosheath ions. This region contains soft suprathermal (<500 eV) electron bursts in antifield and/or field-aligned directions. We present an example of such observations which s…
On comparing estimates of low-l solar p-mode frequencies from Sun-as-a-star and resolved observations
Chaplin, W. J.; Elsworth, Y.; Appourchaux, T. +3 more
Low-angular-degree (low-l) solar p modes provide a sensitive probe of the radiative interior and core of the Sun. Estimates of their centroid frequencies can be used to constrain the spherically symmetric structure of these deep-lying layers. The required data can be extracted from two types of observation: one where the modes are detected in inte…
XMM-Newton Observation of the Double Pulsar System J0737-3039
Campana, Sergio; Possenti, Andrea; Burgay, Marta
We report on a 50 ks XMM-Newton observation of the double pulsar system J0737-3039 performed in 2004 April. We present results of the spectral analysis of these data combined with the much shorter Chandra pointing performed in 2004 January. Blackbody emission with an effective temperature of 0.20+0.02-0.02 keV (90% confidence…
Anisotropy and Alfvénicity of hourly fluctuations in the fast polar solar wind
Neugebauer, M.
Ulysses magnetic and plasma data obtained in the fast polar solar wind are used to study the nature of fluctuations in the frequency range between the turbulent inertial range and the lower-frequency range dominated by quasi-static structures originating at the Sun. For daily variations of hourly averages of the magnetic field components the aniso…
On the observed disc temperature of accreting intermediate mass black holes
Fabian, A. C.; Miller, J. M.; Ross, R. R.
Some ultraluminous X-ray sources in nearby galaxies show soft components resembling thermal disc emission. Calculations based on blackbody emission then indicate that the accreting black holes at the centres of these discs have masses of hundreds to thousands solar mass. Establishing the existence of such intermediate mass black holes is of consid…
Spatially resolved X-ray emission of EQ Pegasi
Schmitt, J. H. M. M.; Ness, J. -U.; Robrade, J.
We present an analysis of an XMM-Newton observation of the M dwarf binary EQ Pegasi with a special focus on the spatial structure of the X-ray emission and the analysis of light curves. Making use of data obtained with EPIC (European Photon Imaging Camera) we were for the first time able to spatially resolve the two components in X-rays and to stu…
Systematic astrometric observations of Proteus
Andrei, A. H.; Veiga, C. H.; Descamps, P. +2 more
Earth based observations of Proteus are made highly difficult by the magnitude difference with Neptune, and the closeness to the planet. To overcome these difficulties, observation campaigns using a Hg-mask coronograph developed for astrometry are being pursued at the Laboratório Nacional de Astrofísica, Brazil. The observations are made at visibl…
Heliospheric energetic particle observations by the Cassini spacecraft: Correlation with 1 AU observations
Livi, S.; Dougherty, M. K.; Lario, D. +3 more
We present energetic particle measurements from the Low-Energy Magnetospheric Measurement System (LEMMS) on board the Cassini spacecraft during its heliospheric cruise to Saturn. We cover 3 years (2000-2002) of data during the maximum of the solar cycle 23. Cassini's heliocentric radial distance ranged from 2.5 to 8.0 AU. Energetic particle intens…
NGC 5385, NGC 2664 and Collinder 21: Three candidate open cluster remnants
Villanova, S.; Carraro, G.; de la Fuente Marcos, R. +1 more
We present CCD UBVI photometric and medium/high resolution spectroscopic observations obtained in the field of the previously unstudied dissolving open cluster candidates NGC 5385, NGC 2664 and Collinder 21. Our analysis is based on the discussion of star counts, photometry, radial velocity distribution, and proper motions available from the Tycho…