Search Publications
Local Kinetic Effects in Two-Dimensional Plasma Turbulence
Veltri, P.; Califano, F.; Servidio, S. +1 more
Using direct numerical simulations of a hybrid Vlasov-Maxwell model, kinetic processes are investigated in a two-dimensional turbulent plasma. In the turbulent regime, kinetic effects manifest through a deformation of the ion distribution function. These patterns of non-Maxwellian features are concentrated in space nearby regions of strong magneti…
HerMES: deep number counts at 250 µm, 350 µm and 500 µm in the COSMOS and GOODS-N fields and the build-up of the cosmic infrared background
Berta, S.; Aussel, H.; Le Floc'h, E. +58 more
Aims: The Spectral and Photometric Imaging REceiver (SPIRE) onboard the Herschel space telescope has provided confusion limited maps of deep fields at 250 µm, 350 µm, and 500 µm, as part of the Herschel Multi-tiered Extragalactic Survey (HerMES). Unfortunately, due to confusion, only a small fraction of the cosmic infrared b…
Particle Acceleration in the Magnetotail and Aurora
Zelenyi, L. M.; Baker, D. N.; Artemyev, A. V. +3 more
This paper deals with acceleration processes in the magnetotail and the processes that enhance particle precipitation from the tail into the ionosphere through electric fields in the auroral acceleration region, generating or intensifying discrete auroral arcs. Particle acceleration in the magnetotail is closely related to substorms and the occurr…
X-ray surface brightness and gas density fluctuations in the Coma cluster
Böhringer, H.; Sunyaev, R.; Churazov, E. +6 more
X-ray surface brightness fluctuations in the core (650 × 650 kpc) region of the Coma cluster observed with XMM-Newton and Chandra are analysed using a 2D power spectrum approach. The resulting 2D spectra are converted to 3D power spectra of gas density fluctuations. Our independent analyses of the XMM-Newton and Chandra observations are in excelle…
Electric structure of dipolarization front at sub-proton scale
André, M.; Vaivads, A.; Huang, S. Y. +2 more
Using Cluster data, we investigate the electric structure of a dipolarization front (DF) - the ion inertial length (c/ωpi) scale boundary in the Earth's magnetotail formed at the front edge of an earthward propagating flow with reconnected magnetic flux. We estimate the current density and the electron pressure gradient throughout the D…
A combined optical and X-ray study of unobscured type 1 active galactic nuclei - I. Optical spectra and spectral energy distribution modelling
Done, Chris; Ward, Martin; Jin, Chichuan +1 more
We present modelling and interpretation of the continuum and emission lines for a sample of 51 unobscured type 1 active galactic nuclei (AGNs). All of these AGNs have high-quality spectra from both XMM-Newton and the Sloan Digital Sky Survey. We extend the wavelength coverage where possible by adding simultaneous ultraviolet data from the OM onboa…
GOODS-Herschel and CANDELS: The Morphologies of Ultraluminous Infrared Galaxies at z ~ 2
Bell, Eric F.; Dickinson, Mark; Ferguson, Henry C. +40 more
Using deep 100 and 160 µm observations in GOODS-South from GOODS-Herschel, combined with high-resolution HST/WFC3 near-infrared imaging from CANDELS, we present the first detailed morphological analysis of a complete, far-infrared (FIR) selected sample of 52 ultraluminous infrared galaxies (ULIRGs; L IR > 1012 L
A Cool Dust Factory in the Crab Nebula: A Herschel Study of the Filaments
Ivison, R. J.; Henning, Th.; Krause, O. +13 more
Whether supernovae are major sources of dust in galaxies is a long-standing debate. We present infrared and submillimeter photometry and spectroscopy from the Herschel Space Observatory of the Crab Nebula between 51 and 670 µm as part of the Mass Loss from Evolved StarS program. We compare the emission detected with Herschel with multiwavele…
Composition of the Solar Corona, Solar Wind, and Solar Energetic Particles
Schmelz, J. T.; Reames, D. V.; von Steiger, R. +1 more
Along with temperature and density, the elemental abundance is a basic parameter required by astronomers to understand and model any physical system. The abundances of the solar corona are known to differ from those of the solar photosphere via a mechanism related to the first ionization potential of the element, but the normalization of these val…
Strong Tidal Dissipation in Saturn and Constraints on Enceladus' Thermal State from Astrometry
Charnoz, Sébastien; Mathis, Stéphane; Tobie, Gabriel +8 more
Tidal interactions between Saturn and its satellites play a crucial role in both the orbital migration of the satellites and the heating of their interiors. Therefore, constraining the tidal dissipation of Saturn (here the ratio k 2/Q) opens the door to the past evolution of the whole system. If Saturn's tidal ratio can be determined at…