Search Publications
Hydrogen in the extended Venus exosphere
Zhang, T. L.; Volwerk, M.; Bertaux, J. L. +4 more
The nearly absence of water in the atmosphere of Venus is a major difference to the situation at Earth. The actual content of hydrogen in the exosphere is still an open issue, since no in situ measurements are available yet. A different method uses the presence of proton cyclotron waves as an early tracer of ionized planetary hydrogen picked-up by…
Physical properties of amorphous solid interstellar material from X-ray absorption spectroscopy of Scorpius X-1
Costantini, E.; de Vries, C. P.
High-quality, high-resolution X-ray spectra were obtained of
COSMOS 5921+0638: characterization and analysis of a new strong gravitationally lensed AGN
Kneib, J. -P.; Koekemoer, A. M.; Faure, C. +4 more
Context: Strong lens candidates have been newly identified within the COSMOS field. We present VLT/FORS1 spectroscopic follow-up observations and HST/WFPC2 imaging of the system COSMOS 5921+0638, which exhibits quadruply lensed images and a perfect Einstein ring.
Aims: We investigate the nature of COSMOS 5921+0638 by studying its photometric, …
Water Production in Comets 2001 Q4 (NEAT) and 2002 T7 (LINEAR) Determined from SOHO/SWAN Observations
Bertaux, J. -L.; Combi, M. R.; Quémerais, E. +2 more
On the Heating Efficiency Derived from Observations of Young Super Star Clusters in M82
Monreal-Ibero, Ana; Tenorio-Tagle, Guillermo; Muñoz-Tuñón, Casiana +3 more
Here, we discuss the mechanical feedback that massive stellar clusters provide to the interstellar medium of their host galaxy. We apply an analytic theory developed in a previous study for M82-A1 to a sample of 10 clusters located in the central zone of the starburst galaxy M82, all surrounded by compact and dense H II regions. We claim that the …
Evidence for Mixed Helicity in Erupting Filaments
Wang, Y. -M.; Kliem, B.; Muglach, K.
Erupting filaments are sometimes observed to undergo a rotation about the vertical direction as they rise. This rotation of the filament axis is generally interpreted as a conversion of twist into writhe in a kink-unstable magnetic flux rope. Consistent with this interpretation, the rotation is usually found to be clockwise (as viewed from above) …
Suzaku observation of IGR J16318-4848
Nowak, M. A.; Tomsick, J. A.; Walter, R. +4 more
We report on the first <sl>Suzaku</sl> observation of IGR J16318-4848, the most extreme example of a new group of highly absorbed X-ray binaries that have recently been discovered by the International Gamma-Ray Astrophysics Laboratory (<sl>INTEGRAL</sl>). The <sl>Suzaku</sl> observation was carried out between 2…
The correlation of fractal structures in the photospheric and the coronal magnetic field
Moussas, X.; Anastasiadis, A.; Georgoulis, M. +4 more
Context: This work examines the relation between the fractal properties of the photospheric magnetic patterns and those of the coronal magnetic fields in solar active regions.
Aims: We investigate whether there is any correlation between the fractal dimensions of the photospheric structures and the magnetic discontinuities formed in the corona…
The nature of the X-ray binary IGR J19294+1816 from INTEGRAL, RXTE, and Swift observations
Chaty, S.; Tomsick, J. A.; Rodriguez, J. +4 more
We report the results of a high-energy multi-instrumental campaign with INTEGRAL, RXTE, and Swift of the recently discovered INTEGRAL source IGR J19294+1816. The Swift/XRT data allow us to refine the position of the source to {RA}J2000 = 19h 29m 55.9s {Dec}J2000 = +18° 18 arcmin38.4 arcsec (±3…
Episodes of floods in Mangala Valles, Mars, from the analysis of HRSC, MOC and THEMIS images
Head, James W.; Greeley, Ronald; van Gasselt, Stephan +9 more
The Mangala Valles is a 900-km long outflow channel system in the highlands adjacent to the south-eastern flank of the Tharsis bulge. This work was intended to answer the following two questions unresolved in previous studies: (1) Was there only one source of water (Mangala Fossa at the valley head which is one of the Medusae Fossae troughs or gra…