Search Publications
Missions
Journals
Publication Years
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…
Evidence for a Photoevaporated Circumbinary Disk in Orion
Robberto, M.; Da Rio, N.; Ricci, L. +1 more
We have found a photoevaporated disk in the Orion Nebula that includes a wide binary. HST ACS observations of the proplyd 124-132 show two pointlike sources separated by 0.15'', or about 60 AU at the distance of Orion. The two sources have nearly identical I and z magnitudes. We analyze the brightest component, source N, comparing the observed mag…
The Radio Signature of Magnetic Reconnection for the M-Class Flare of 2004 November 1
Ji, Haisheng; Huang, Guangli; Wu, Guiping
In this Letter, we present radio diagnostics for the magnetic field and the density distribution of nonthermal electrons in the microwave source of the M1.1 flare of 2004 November 1. We calculate the nonthermal gyrosynchrotron radiation using observations made at the Nobeyama Radio Observatory to get the longitudinal magnetic field and the magnitu…
Puzzling X-rays from the new colliding wind binary Wolf-Rayet 65 (WC9d)
Hamann, W. -R.; Oskinova, L. M.
We report the discovery of variability in the X-ray emission from the Wolf-Rayet type star WR65. Using archival Chandra data spanning over 5yr, we detect changes of the X-ray flux by a factor of 3 accompanied by changes in the X-ray spectra. We believe that this X-ray emission originates from wind-wind collision in a massive binary system. The obs…