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Formation of Saturn's ring spokes by lightning-induced electron beams
Krupp, N.; Woch, J.; Fränz, M. +10 more
Spokes are near-linear markings sometimes visible on Saturn's rings. They are widely accepted as being electrostatically-levitated sheets of ~0.6 micron-radius charged grains. Previously-suggested causes of the grains' charging do not agree with all spoke characteristics, which include their rapid generation, localized formation primarily in Satur…
The X-ray properties of optically selected z > 0.6 clusters in the European Southern Observatory Distant Cluster Survey
Pelló, R.; Milvang-Jensen, B.; Halliday, C. +11 more
We present XMM-Newton observations of three optically selected z > 0.6 clusters from the European Southern Observatory (ESO) Distant Cluster Survey (EDisCS), comprising the first results of a planned X-ray survey of the full EDisCS high-redshift sample. The EDisCS clusters were identified in the Las Campanas Distant Cluster Survey as surface br…
The Influence of Mass and Environment on the Evolution of Early-Type Galaxies
Lanzoni, Barbara; Jørgensen, Inger; di Serego Alighieri, Sperello
We report on a uniform comparative analysis of the fundamental parameters of early-type galaxies at z~1 down to MB<=-20, both in the field and in clusters. The changes in the M/LB ratio from z~1 to today are larger for lower mass galaxies in all environments, and are larger in the field than in clusters for galaxies with t…
Lightning detection on the Venus Express mission
Russell, C. T.; Zhang, T. L.; Strangeway, R. J.
Radio waves and optical flashes consistent with the lightning generation have been reported frequently at Venus. These observations point to the presence of electrical discharges in the sulfuric acid clouds of Venus. A particularly strong whistler-mode signal has been found propagating parallel to the magnetic field in the night ionosphere near 10…
Estimated IR and phosphorescence emission fluxes for specific polycyclic aromatic hydrocarbons in the Red Rectangle
Joblin, C.; Toublanc, D.; Mulas, G. +1 more
Following tentative identification of the blue luminescence in the
On the Propagation and Dissipation of Alfvén Waves in Coronal Holes
Srivastava, A. K.; Dwivedi, B. N.
We underline the importance of Alfvén wave dissipation in the magnetic funnels through the viscous and resistive plasma. Our results show that Alfvén waves are one of the primary energy sources in the innermost part of coronal holes where the solar wind outflow starts.
XMM-Newton observations of the complex spin pulse of the intermediate polar PQ Geminorum
Hellier, Coel; Ramsay, Gavin; Evans, P. A.
The intermediate polar PQ Geminorum shows a complex pulsation, caused by a spinning white dwarf, which varies markedly with wavelength. We report XMM-Newton observations, including the soft and hard X-ray bands and the first ultraviolet light curves of this star. We update the ephemeris for PQ Gem allowing us to align these data with a compilation…
Improved input to the empirical coronal mass ejection (CME) driven shock arrival model from CME cone models
St. Cyr, O. C.; Gopalswamy, N.; Michalek, G. +4 more
We study the Sun-Earth travel time of interplanetary shocks driven by coronal mass ejections (CMEs) using empirical cone models. Three different cone models have been used to obtain the radial speeds of the CMEs, which are then used as input to the empirical shock arrival (ESA) model to obtain the Sun to Earth travel time of the shocks. We compare…
Understanding the Nuclear Gas Dispersion in Early-Type Galaxies in the Context of Black Hole Demographics
van der Marel, Roeland P.; Verdoes Kleijn, Gijs A.; Noel-Storr, Jacob
The majority of nearby early-type galaxies contain detectable amounts of emission-line gas at their centers. The nuclear gas kinematics form a valuable diagnostic of the central black hole (BH) mass. Here we analyze and model Hubble Space Telescope STIS observations of a sample of 27 galaxies; 16 Fanaroff-Riley Type I radio galaxies and 11 (more) …
A model of the ionosphere of Saturn's rings and its implications
Luhmann, J. G.; Tokar, R. L.; Johnson, R. E. +2 more
The detection of cold O2+ and O + ions in the vicinity of Saturn's rings during the Cassini Orbiter orbit insertion confirmed expectations that the rings would have a water product atmosphere and ionosphere. These observations prompted a new look at their origin and nature by Johnson et al. [Johnson, R.E., Luhmann, J.G., Tokar, R.L., Bo…