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3D Reconstruction of a Rotating Erupting Prominence
Török, T.; Thompson, W. T.; Kliem, B.
A bright prominence associated with a coronal mass ejection (CME) was seen erupting from the Sun on 9 April 2008. This prominence was tracked by both the Solar Terrestrial Relations Observatory (STEREO) EUVI and COR1 telescopes, and was seen to rotate about the line of sight as it erupted; therefore, the event has been nicknamed the "Cartwheel CME…
Coronal activity cycles in nearby G and K stars. XMM-Newton monitoring of 61 Cygni and α Centauri
Schmitt, J. H. M. M.; Robrade, J.; Favata, F.
Context. While we have ample evidence of stellar analogues to the solar activity cycle for chromospheric activity, very little is known about stellar coronal cycles and their possible similarities to the solar behavior.
Aims: An ongoing X-ray monitoring program of solar-like stars with XMM-Newton is performed to investigate coronal activity c…
An optical/NIR survey of globular clusters in early-type galaxies. III. On the colour bimodality of globular cluster systems
Larsen, S. S.; Kuntschner, H.; Cantiello, M. +4 more
Context. The interpretation that bimodal colour distributions of globular clusters (GCs) reflect bimodal metallicity distributions has been challenged. Non-linearities in the colour to metallicity conversions caused for example by the horizontal branch (HB) stars may be responsible for transforming a unimodal metallicity distribution into a bimoda…
The universal Einstein radius distribution from 10 000 SDSS clusters
Broadhurst, Tom; Oguri, Masamune; Zitrin, Adi +5 more
We present results from strong lens modelling of 10 000 Sloan Digital Sky Survey (SDSS) clusters, to establish the universal distribution of Einstein radii. Detailed lensing analyses have shown that the inner mass distribution of clusters can be accurately modelled by assuming light traces mass, successfully uncovering large numbers of multiple im…
Evolution of the observed Lyα luminosity function from z = 6.5 to z = 7.7: evidence for the epoch of reionization?
Kneib, J. -P.; Lidman, C.; Willis, J. +17 more
Aims: Lyα emitters (LAEs) can be detected out to very high redshifts during the epoch of reionization. The evolution of the LAE luminosity function with redshift is a direct probe of the Lyα transmission of the intergalactic medium (IGM), and therefore of the IGM neutral-hydrogen fraction. Measuring the Lyα luminosity function (LF) of Lyα emi…
Herschel PACS and SPIRE Observations of Blazar PKS 1510-089: A Case for Two Blazar Zones
Szczerba, Ryszard; Nalewajko, Krzysztof; Madejski, Greg M. +5 more
We present the results of observations of blazar PKS 1510-089 with the Herschel Space Observatory PACS and SPIRE instruments, together with multiwavelength data from Fermi/LAT, Swift, SMARTS, and Submillimeter Array. The source was found in a quiet state, and its far-infrared spectrum is consistent with a power law with a spectral index of α ~= 0.…
The 12C/13C Ratio on Titan from Cassini INMS Measurements and Implications for the Evolution of Methane
Nixon, Conor A.; Mousis, Olivier; Lunine, Jonathan I. +6 more
We have re-evaluated the Cassini Ion Neutral Mass Spectrometer (INMS) 12C/13C ratios in the upper atmosphere of Titan based on new calibration sensitivities and an improved model for the NH3 background in the 13CH4 mass channel. The INMS measurements extrapolated to the surface give a 12<…
X-Ray Emission from an Asymmetric Blast Wave and a Massive White Dwarf in the Gamma-Ray Emitting Nova V407 Cyg
Chomiuk, Laura; Mukai, Koji; Donato, Davide +2 more
Classical nova events in symbiotic stars, although rare, offer a unique opportunity to probe the interaction between ejecta and a dense environment in stellar explosions. In this work, we use X-ray data obtained with Swift and Suzaku during the recent classical nova outburst in V407 Cyg to explore such an interaction. We find evidence of both equi…
Optical extinction due to aerosols in the upper haze of Venus: Four years of SOIR/VEX observations from 2006 to 2010
Bertaux, Jean-Loup; Vandaele, Ann Carine; Robert, Séverine +3 more
The variability of the aerosol loading in the mesosphere of Venus is investigated from a large data set obtained with SOIR, a channel of the SPICAV instrument suite onboard Venus Express. Vertical profiles of the extinction due to light absorption by aerosols are retrieved from a spectral window around 3.0 µm recorded in many solar occultati…
Solar Wind Models from the Chromosphere to 1 AU
Velli, Marco; Hansteen, Viggo H.
Recent models of the fast solar wind are characterized by low coronal electron temperatures while proton, α-particle, and minor ion temperatures are expected to be quite high and generally anisotropic, including large temperatures perpendicular to the magnetic field and parallel beams. This entails that the electric field should be relatively unim…