Search Publications
Latitudinal and radial gradients of galactic cosmic ray protons in the inner heliosphere - PAMELA and Ulysses observations
Gieseler, J.; Heber, B.; Picozza, P. +5 more
Ulysses, launched on 6 October 1990, was placed in an elliptical, high inclined (80.2°) orbit around the Sun, and was switched off in June 2009. It has been the only spacecraft exploring high-latitude regions of the inner heliosphere. The Kiel Electron Telescope (KET) aboard Ulysses measures electrons from 3 MeV to a few GeV and protons and helium…
A strategy to measure the dark energy equation of state using the H II galaxy Hubble function and X-ray active galactic nuclei clustering: preliminary results
Terlevich, E.; Terlevich, R.; Bresolin, F. +4 more
We explore the possibility of setting stringent constraints to the dark energy equation of state using alternative cosmic tracers like (a) the Hubble relation using H II galaxies, which can be observed at much higher redshifts (z≲ 3.5) than those currently traced by Type Ia supernovae (SNeIa) samples, and (b) the large-scale structure using the cl…
The role of suprathermal particle measurements in CrossScale studies of collisionless plasma processes
Davies, Jackie; Hapgood, Mike; Perry, Chris +1 more
The CrossScale mission will advance our understanding of fundamental plasma processes in collisionless plasmas. It will exploit the excellent natural plasma laboratory provided by the Earth's magnetosphere and the near-Earth solar wind and, in particular, carry out multi-scale studies that will strongly complement plasma studies in ground-based la…
Dynamical evolution of a magnetic cloud from the Sun to 5.4 AU
Mandrini, C. H.; Gulisano, A. M.; Démoulin, P. +2 more
Context. Significant quantities of magnetized plasma are transported from the Sun to the interstellar medium via interplanetary coronal mass ejections (ICMEs). Magnetic clouds (MCs) are a particular subset of ICMEs, forming large-scale magnetic flux ropes. Their evolution in the solar wind is complex and mainly determined by their own magnetic for…
Proton/electron temperature ratio in the magnetotail
Petrukovich, A. A.; Dandouras, I.; Nakamura, R. +3 more
We study the temperature ratio of protons and electrons based on statistics of Cluster observations in the Earth's magnetotail from 2001 to 2004. During these years, from June to November, the Cluster spacecraft visited the plasma sheet at the distance r~-19 RE. We use proton and electron moments collected in the central region of the p…
Emission and propagation of Saturn kilometric radiation: Magnetoionic modes, beaming pattern, and polarization state
Schippers, P.; Gurnett, D. A.; Kurth, W. S. +7 more
The Cassini mission crossed the source region of the Saturn kilometric radiation (SKR) on 17 October 2008. On this occasion, the Radio and Plasma Wave Science (RPWS) experiment detected both local and distant radio sources, while plasma parameters were measured in situ by the magnetometer and the Cassini Plasma Spectrometer. A goniopolarimetric in…
On the Origin of Ultraviolet Emission and the Accretion Model of Low-luminosity Active Galactic Nuclei
Ho, Luis C.; Yuan, Feng; Yu, Zhaolong
Low-luminosity active galactic nuclei (LLAGNs) are generally believed to be powered by an inner radiatively inefficient, advection-dominated accretion flow (ADAF), an outer truncated thin disk, and a jet. Maoz recently challenged this picture based on the observation that the strength of ultraviolet emission relative to the X-ray and radio bands d…
X-ray monitoring of classical novae in the central region of M 31. II. Autumn and winter 2007/2008 and 2008/2009
Della Valle, M.; Pietsch, W.; Haberl, F. +7 more
Context. Classical novae (CNe) represent the major class of supersoft X-ray sources (SSSs) in the central region of the galaxy M 31.
Aims: We performed a dedicated monitoring of the M 31 central region with XMM-Newton and Chandra between Nov. 2007 and Feb. 2008 and between Nov. 2008 and Feb. 2009, respectively, to find SSS counterparts of CNe…
High precision thermal modeling of complex systems with application to the flyby and Pioneer anomaly
Rievers, B.; Lämmerzahl, C.
Thermal modeling of complex systems faces the problems of an effective digitalization of the detailed geometry and properties of the system, calculation of the thermal flows and temperature maps, treatment of the thermal radiation including possible multiple reflections, inclusion of additional external influences, extraction of the radiation pres…
The Resolved Stellar Halo of NGC 253
Bell, Eric F.; Radburn-Smith, David J.; Bailin, Jeremy +2 more
We have obtained Magellan/IMACS and Hubble Space Telescope (HST)/Advanced Camera for Surveys imaging data that resolve red giant branch stars in the stellar halo of the starburst galaxy NGC 253. The HST data cover a small area, and allow us to accurately interpret the ground-based data, which cover 30% of the halo to a distance of 30 kpc, allowing…