Search Publications
Phase models of the Milky Way stellar disc
Orlov, V. V.; Rodionov, S. A.
We present a new iterative method for constructing equilibrium phase models of stellar systems. Importantly, this method can provide phase models with arbitrary mass distributions. The method is based on the following principle. Our task is to generate an equilibrium N-body system with a given mass distribution. For this purpose, we let the system…
Simultaneous tracking of reconnected flux tubes: Cluster and conjugate SuperDARN observations on 1 April 2004
Lester, M.; Dunlop, M. W.; Taylor, M. G. G. T. +7 more
While the Cluster spacecraft were located near the high-latitude magnetopause, between 11:30-13:00 UT on 1 April 2004, a series of medium to large scale (40 nT, 0.6-1.2 Re) FTEs were observed. During this pass, simultaneous and conjugated SuperDARN measurements are available that show a global flow pattern which is consistent with the expected (ma…
Can the Flyby Anomalies be Explained by a Modification of Inertia
McCulloch, M. E.
The flyby anomalies are unexplained velocity increases of 3.92, 13.46, 0.11 and 1.82 mm/s observed near closest approach during the Earth flybys of the Galileo, NEAR, Cassini and Rosetta spacecraft respectively. Here, these flybys are modelled using a theory called Modified Inertia due to a Hubble-scale Casimir effect (MIHsC). The model suggests t…
The Source Region of Coronal Mass Ejections
Lara, Alejandro
We use the large database of coronal mass ejections (CMEs) observed by SOHO LASCO during solar cycle 23 to statistically obtain information about the source regions of CMEs. By determining the functional form of the position angle (P.A.) distribution, we are able to construct a random set of CME direction vectors (DVCME) under the follo…
Quiescent X-ray emission from the M9 dwarf LHS 2065
Schmitt, J. H. M. M.; Robrade, J.
Aims: X-ray emission is an important diagnostics to study magnetic activity in very low mass stars that are presumably fully convective and have an effectively neutral photosphere.
Methods: We investigate an archival XMM-Newton observation of LHS 2065, an ultracool dwarf with spectral type M9.
Results: We clearly detect LHS 2065 at soft X-…
Two sources of magnetosheath ions observed by Cluster in the mid-altitude polar cusp
Berchem, J.; Escoubet, C. P.; Pitout, F. +10 more
Double cusps have been observed on a few occasions by polar orbiting spacecraft and ground-based observatories. The four Cluster spacecraft observed two distinct regions, showing characteristics of a double cusp, during a mid-altitude cusp pass on 7 August 2004. The Wind spacecraft detected a southward turning of the Interplanetary Magnetic Field …
Hubble Space Telescope/Advanced Camera for Surveys Narrowband Imaging of the Kepler Supernova Remnant
Blair, William P.; Rudnick, Lawrence; Harrus, Ilana M. +4 more
We present narrowband images of the Kepler supernova remnant obtained with the Advanced Camera for Surveys aboard the Hubble Space Telescope. The images, with an angular resolution of 0.05'', reveal the structure of the emitting gas in unprecedented detail. Radiative and nonradiative shocks are found in close proximity, unresolvable in ground-base…
Radiation characteristics of quasi-periodic radio bursts in the Jovian high-latitude region
Morioka, Akira; Tsuchiya, Fuminori; Misawa, Hiroaki +2 more
Ulysses had a "distant encounter" with Jupiter in February 2004. The spacecraft passed from north to south, and it observed Jovian radio waves from high to low latitudes (from +80° to +10°) for few months during its encounter. In this study, we present a statistical investigation of the occurrence characteristics of Jovian quasi-periodic bursts, u…
INTEGRAL observation of the accreting pulsar 1E1145.1-6141
Santangelo, A.; Segreto, A.; Ferrigno, C. +2 more
Aims: We analyze 1050 ks of INTEGRAL data of the high mass X-ray binary pulsar 1E 1145.1-6141 to study its properties over a long time baseline, from June 2003 to June 2004, with wide spectral coverage.
Methods: We study three high luminosity episodes, two of them at the system apoastron, three brightening with lower intensity, two at the peri…
Internal kinematics of spiral galaxies in distant clusters. III. Velocity fields from FORS2/MXU spectroscopy
Böhm, A.; Peletier, R. F.; Kuntschner, H. +8 more
Context: We continue our investigation on how the cluster environment affects the evolution of galaxies.
Aims: By examining both galaxy structure and internal kinematics of cluster galaxies at lookback times of ~5 Gyr we study the nature and impact of possible interactions at the peak epoch of cluster assembly.
Methods: Going beyond our pr…