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Huygens probe entry and descent trajectory analysis and reconstruction techniques
Lebreton, J. -P.; Ferri, F.; Gaborit, V. +2 more
Cassini/Huygens is a joint National Aeronautics and Space Administration (NASA)/European Space Agency (ESA)/Agenzia Spaziale Italiana (ASI) mission on its way to explore the Saturnian system. The ESA Huygens Probe is scheduled to be released from the Orbiter on 25 December 2004 and enter the atmosphere of Titan on 14 January 2005. Probe delivery t…
Streamers and adjacent regions observed by UVCS/SOHO: A comparison between different phases of solar activity
Romoli, M.; Spadaro, D.; Ventura, R. +1 more
UVCS/SOHO observations of the O VI resonance doublet and H I Lyα line intensities and profiles, together with measurements of the visible linearly polarized radiance, have been performed during two MEDOC campaigns in 1997 and 2000, i.e. near solar minimum and approaching the solar maximum phase, respectively. During both observational runs mid-lat…
HST Images Do Not Support the Presence of Three High-Velocity, Low-Mass Runaway Stars in the Core of the Orion Nebula Cluster
O'Dell, C. R.; Robberto, Massimo; Poveda, Arcadio +1 more
A recent article has employed the determination from ground-based images of high proper motions in the Orion Nebula cluster to argue that JW 349, JW 355, and JW 451 are high-velocity (38, 89, and 69 km s-1, respectively) low-mass runaway stars. We report on the measurement of the proper motions of these stars using images made by the Hu…
On the nature of the unidentified solar emission near 117 nm
Bertaux, J. -L.; Wilhelm, K.; Marsch, E. +6 more
Spectral observations of the Sun in the vacuum-ultraviolet wavelength range by SUMER on SOHO led to the discovery of unusual emission features - called humps here - at 116.70 nm and 117.05 nm on either side of the He i 58.43 nm line. This resonance line is seen in the second order of diffraction, whereas the humps are recorded in the first order w…
COSAC Onboard Rosetta: A Bioastronomy Experiment for the Short-Period Comet 67P/Churyumov-Gerasimenko
Roll, Reinhard; Rosenbauer, Helmut; Gösmann, Fred +1 more
The COSAC (Cometary Sampling and Composition Experiment) onboard the Rosetta mission is a combined gas chromatograph (GC)-mass spectrometer (MS). It is situated on Philae, the lander of the mission, which is intended to land on the nucleus of comet 67/PChuryumov- Gerasimenko. The purpose of the experiment is to analyze the volatile fraction of soi…
SX Phoenicis Stars in the Globular Cluster M 13
Kopacki, G.
We present results of the search for SX Phe stars in the globular cluster M 13. In photometric reductions we used the image subtraction method supplemented with procedure of searching for short-period variable stars, based on the examination of each pixel in the CCD frames. We illustrate also the ability of this approach to find variability with s…
The XMM-Newton View of the Relativistic Spectral Features in AX J0447-0627
Ballo, L.; Braito, V.; Della Ceca, R. +1 more
The XMM-Newton observation of the optically type 1 active galactic nucleus (AGN) AX J0447-0627 (z=0.214) unambiguously reveals a complex, bright, and prominent set of lines in the 4-8 keV rest-frame energy range. Although from a phenomenological point of view, the observed properties can be described by a simple power-law model plus five narrow Ga…
Morphological studies of the Spitzer Wide-Area Infrared Extragalactic survey galaxy population in the UGC 10214 Hubble Space Telescope/Advanced Camera for Surveys field
Pérez-Fournon, I.; Rodighiero, G.; Hatziminaoglou, E. +16 more
We present the results of a morphological analysis of a small subset of the Spitzer Wide-Area Infrared Extragalactic survey (SWIRE) galaxy population. The analysis is based on public Advanced Camera for Surveys (ACS) data taken inside the SWIRE N1 field, which are the deepest optical high-resolution imaging available within the SWIRE fields as of …
Constraining the thermal history of the warm-hot intergalactic medium
Finoguenov, A.; Maiolino, R.; Gilli, R. +3 more
We have identified a large-scale structure traced by galaxies at z=0.8, within the Lockman Hole, by means of multi-object spectroscopic observations. By using deep XMM images we have investigated the soft X-ray emission from the Warm-Hot Intergalactic Medium (WHIM) expected to be associated with this large-scale structure and we set a tight upper …
New Observations of the Pulsar Wind Nebula in the Supernova Remnant CTB 80
Moiseev, A. V.; Blinnikov, S. I.; Lozinskaya, T. A. +1 more
We investigated the kinematics of the pulsar wind nebula (PWN) in the old supernova remnant CTB 80 using the Fabry-Perot interferometer of the 6-m Special Astrophysical Observatory telescope. In addition to the previously known expansion of the system of bright filaments with a velocity of 100 200 km s-1, we detected weak high-velocity features in…