Search Publications
Mode visibilities in radial velocity and intensity Sun-as-a-star helioseismic measurements
García, R. A.; Ballot, J.; Salabert, D.
We analyze more than 5000 days of Sun-as-a-star radial velocity GOLF and intensity VIRGO observations to measure the visibilities of the I = 0, 1, 2, and 3 modes and the m-amplitude ratios of the I = 2 and 3 modes in the solar acoustic spectrum. We provide observational values that we compare to theoretical predictions.
Is a Rikitake Dynamo in Saturn's Interior at the Origin of the Variability of the Radio Rotation Periods?
Galopeau, P. H. M.
Recent observations performed by the radio and plasma wave science (RPWS) experiment on board the Cassini spacecraft have revealed the presence of two distinct and variable spin modulation periods (10.6 hours and 10.8 hours) in Saturn's radio emissions emanating from the northern and southern hemispheres respectively. The main time modulation of p…
Variation in the frequency separations with activity and impact on stellar parameter determination
García, R. A.; Creevey, O. L.; Salabert, D.
Frequency separations used to infer global properties of stars through asteroseismology can change depending on the strength and at what epoch of the stellar cycle the p-mode frequencies are measured. In the Sun these variations have been seen, even though the Sun is a low-activity star. In this paper, we discuss these variations and their impact …
On ion escape from Venus
Jarvinen, R.
This doctoral thesis is about the solar wind influence on the atmosphere of the planet Venus. A numerical plasma simulation model was developed for the interaction between Venus and the solar wind to study the erosion of charged particles from the Venus upper atmosphere. The developed model is a hybrid simulation where ions are treated as particle…
Lossy Compression of Weak-Lensing Data
Massey, Richard; Rhodes, Jason; Bernstein, Gary M. +4 more
Future orbiting observatories will survey large areas of sky in order to constrain the physics of dark matter and dark energy using weak gravitational lensing and other methods. Lossy compression of the resultant data will improve the cost and feasibility of transmitting the images through the space communication network. We evaluate the consequen…
Mimas Shape Model V1.0
Gaskell, R. W.
The shape model of Mimas derived by Robert Gaskell from Cassini ISSNA images and Voyager 1 ISSN images. The model is provided in the implicitly connected quadrilateral (ICQ) format. This version of the model was prepared on July 14, 2010. Vertex-facet versions of the models are also provided.
Preliminary velocity flows inside NOA AR 10720 derived by temporally evolving ring diagram analysis of SOHO/MDI dopplergrams
Pintér, Balázs; Burrows, Keiran
Between 13th and 16th January 2005, NOA active region 10720 was the site of several large flares, one of which induced a solar quake. The expanding wave front of the quake was visible across the surface, causing both horizontal and vertical plasma displacements. Using a new temporal scanning technique for ring diagram analysis of SOHO/MDI (Michels…
X-ray properties in massive galaxy clusters: XMM-Newton observations of the REFLEX-DXL sample (Corrigendum)
Zhang, Y. -Y.; Finoguenov, A.; Böhringer, H. +5 more
The article by Zhang et al. (2006, A&A, 456, 55) contains an error in Fig. 5 on page 64, in which we inadvertently re-called the mass distribution of RXCJ0528.9-3972. We note that this does not affect any results in Zhang et al. (2006). Nevertheless, we regret this error and provide an update of Fig. 5 here.
Cherenkov Telescope results on gamma-ray binaries
Cortina, Juan
In the past ten years of regular operations, a new generation of Cherenkov telescopes have established binary systems as a new class of Very High Energy gamma-ray (VHE) emitters. Particle acceleration in these systems may occur either in an accretion-powered jet (microquasar) or in the shock between a pulsar wind and a stellar wind (wind-wind). Th…
The cosmic history of black hole growth
Treister, E.
Significant progress has been made in the last few years in our understand- ing of how and when supermassive black holes form and grow. Here, I review our current knowledge of the cosmic evolution of the population of Active Galactic Nuclei (AGN), which hosts most of the supermassive black hole growth. Thanks to deep multiwavelength surveys it has…