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Post-equinox dynamics and polar cloud structure on Uranus
Sromovsky, L. A.; Fry, P. M.; Hammel, H. B. +2 more
Post equinox imaging of Uranus by HST, Keck, and Gemini telescopes has enabled new measurements of winds over previously sampled latitudes as well as measurements at high northern latitudes that have recently come into better view. These new observations also used techniques to greatly improve signal to noise ratios, making possible the detection …
The Relationship between Hard X-Ray Pulse Timings and the Locations of Footpoint Sources during Solar Flares
Dennis, B. R.; Inglis, A. R.
The cause of quasi-periodic pulsations in solar flares remains the subject of debate. Recently, Nakariakov & Zimovets proposed a new model suggesting that, in two-ribbon flares, such pulsations could be explained by propagating slow waves. These waves may travel obliquely to the magnetic field, reflect in the chromosphere, and constructively i…
The VLT/VISIR mid-IR view of 47 Tucanae. A further step in solving the puzzle of RGB mass loss
Bayo, A.; Milone, A. P.; Bressan, A. +5 more
There is an ongoing debate regarding the onset luminosity of dusty mass loss in population-II red giant stars. We present VLT/VISIR mid-infrared (MIR) 8.6 µm imaging of 47 Tuc, the centre of attention of a number of space-based Spitzer observations and studies. The VISIR high-resolution (diffraction limited) observations allow excellent matc…
The three-dimensional structure of Saturn's E ring
Hedman, M. M.; Burns, J. A.; Hamilton, D. P. +1 more
Saturn's diffuse E ring consists of many tiny (micron and sub-micron) grains of water ice distributed between the orbits of Mimas and Titan. Various gravitational and non-gravitational forces perturb these particles' orbits, causing the ring's local particle density to vary noticeably with distance from the planet, height above the ring-plane, hou…
A physical model for electron radiation belts of Saturn
Lorenzato, Lise; Sicard, AngéLica; Bourdarie, SéBastien
Radiation belts cause irreversible damages to on-board instrument materials. Studies about radiation belts can provide precious information for future interplanetary missions. Pioneer 11, Voyager 2 and nowadays Cassini missions give the characteristics of Saturn's inner magnetosphere: Saturn's famous rings, various moons, neutral particles ejected…
A Comparison of Broad Iron Emission Lines in Archival Data of Neutron Star Low-mass X-Ray Binaries
Reis, Rubens C.; Fabian, Andrew C.; Miller, Jon M. +2 more
Relativistic X-ray disklines have been found in multiple neutron star low-mass X-ray binaries, in close analogy with black holes across the mass scale. These lines have tremendous diagnostic power and have been used to constrain stellar radii and magnetic fields, often finding values that are consistent with independent timing techniques. Here, we…
HerMES: A Statistical Measurement of the Redshift Distribution of Herschel-SPIRE Sources Using the Cross-correlation Technique
Scott, D.; Béthermin, M.; Wang, L. +19 more
The wide-area imaging surveys with the Herschel Space Observatory at submillimeter (sub-mm) wavelengths have now resulted in catalogs of the order of one-hundred-thousand dusty, starburst galaxies. These galaxies capture an important phase of galaxy formation and evolution, but, unfortunately, the redshift distribution of these galaxies, N(z), is …
Transiting exoplanets from the CoRoT space mission. XXIII. CoRoT-21b: a doomed large Jupiter around a faint subgiant star
Mazeh, T.; Aigrain, S.; Alonso, R. +45 more
CoRoT-21, a F8IV star of magnitude V = 16 mag, was observed by the space telescope CoRoT during the Long Run 01 (LRa01) in the first winter field (constellation Monoceros) from October 2007 to March 2008. Transits were discovered during the light curve processing. Radial velocity follow-up observations, however, were performed mainly by the 10-m K…
An Unexpected Discovery in the Rich Open Cluster NGC 6819 Using XMM-Newton
Ramirez-Ruiz, Enrico; Pooley, David; Kalirai, Jason +4 more
We present the first study of the X-ray population of the intermediate-age rich open cluster NGC 6819 using the XMM-Newton Observatory. In the past decade, Chandra X-ray observations have shown a relationship between the X-ray population of globular clusters and their internal dynamics and encounter frequency. We investigate the role dynamics poss…
Spectrally resolved C II emission in M 33 (HerM33es). Physical conditions and kinematics around BCLMP 691
Boquien, M.; Braine, J.; van der Werf, P. +7 more
This work presents high spectral resolution observations of the [C ii] line at 158 µm, one of the major cooling lines of the interstellar medium, taken with the HIFI heterodyne spectrometer on the Herschel satellite. In BCLMP 691, an H ii region far north (3.3 kpc) in the disk of M 33, the [C ii] and CO line profiles show similar velocities …