Search Publications
New observations from Cassini and Ulysses of Jovian VLF radio emissions
Gurnett, D. A.; Hospodarsky, G. B.; Kurth, W. S. +2 more
Simultaneous observations of Jupiter's so-called reradiated VLF radio emission by the Cassini and Ulysses spacecraft confirm that the emission is radiated into all directions in a pulse or strobe light-like fashion. These observations rule out a source that corotates with the planet. Observations of the same VLF emission component during the Cassi…
Astrometric monitoring of the binary brown dwarf DENIS-P J1228.2-1547
Martín, E. L.; Bouy, H.; Brandner, W. +4 more
We present astrometric monitoring data of the binary brown dwarf DENIS-P J1228.2-1547. The data have been obtained with the Hubble Space Telescope over a time span of 5.5 yr, and confirm that DENIS-P J1228.2-1547 is indeed a common proper motion, i.e., physical, binary. The data cover about 1/8th of the binary orbit, indicating an orbital period o…
A Detailed Study of Opacity in the Upper Atmosphere of Proxima Centauri
Christian, D. J.; Mathioudakis, M.; Bloomfield, D. S. +2 more
We present far-UV and UV spectroscopic observations of Proxima Centauri obtained as part of our continued investigation into the optically thin approximation assumed for the transition regions of late-type stars. Significant opacity is found in the C III lines during both the quiescent and flaring states of Proxima Cen, with up to 70% of the expec…
Multiwavelength Properties of the X-Ray Sources in the Groth-Westphal Strip Field
Yamada, Toru; Griffiths, Richard E.; Sarajedini, Vicki +4 more
We summarize the multiwavelength properties of X-ray sources detected in the 80 ks XMM-Newton observation of the Groth-Westphal strip, a contiguous strip of 28 Hubble Space Telescope Wide Field Planetary Camera 2 (WFPC2) images. Among the ~150 X-ray sources detected in the XMM-Newton field of view, 23 are within the WFPC2 fields. Ten spectroscopic…
Acceleration of electrons by interacting CMEs
Odstrcil, D.; Vandas, M.
There is growing observational evidence that interaction of coronal mass ejections (CMEs) near the Sun is a common phenomenon, particularly during the solar cycle's maximum years. Recently, we performed 2.5-D MHD simulations of the interaction between two magnetic flux ropes. The aim was to provide some qualitative picture of the shock-cloud and c…
Cluster observations of ELF/VLF signals generated by modulated heating of the lower ionosphere with the HAARP HF transmitter
Platino, M.; Canu, P.; Bell, T. +5 more
Available from http://www.copernicus.org/site/EGU/annales/22/7/2643.htm?FrameEngine=false;
The tidally disturbed luminous compact blue galaxy Mkn 1087 and its surroundings
Esteban, C.; López-Sánchez, Á. R.; Rodríguez, M.
We present new broad-band optical and near-infrared CCD imaging together with deep optical intermediate-resolution spectroscopy of Mkn 1087 and its surrounding objects. We analyze the morphology and colors of the stellar populations of the brightest objects, some of them star-formation areas, as well as the kinematics, physical conditions and chem…
Observations of Water Vapor Outflow from NML Cygnus
Li, Di; Lim, Tanya; Feuchtgruber, Helmut +2 more
We report new observations of the far-infrared and submillimeter water vapor emission of NML Cygnus based on data gathered with the Infrared Space Observatory and the Submillimeter Wave Astronomy Satellite. We compare the emission from NML Cyg to that previously published for VY CMa and W Hya in an attempt to establish the validity of recently pro…
Gamma-ray all-sky imaging with the Burst and Transient Source Experiment
Hill, A. B.; Knödlseder, J.; Bird, A. J. +6 more
The BATSE mission aboard CGRO monitored the whole sky in the 20 keV-1 MeV energy band continuously from April 1991 until June 2000. Although BATSE had very poor intrinsic angular resolution, the data can be used to survey the entire soft gamma-ray sky with <1° angular resolution and ∼mCrab sensitivity by using the Earth occultation m…
The XMM-Newton observation of GRB 040106: Evidence for an afterglow in a wind environment
Piro, L.; De Pasquale, M.; Gendre, B.
We present the XMM-Newton observation of GRB 040106. From the X-ray spectral index and temporal decay, we argue that the afterglow is consistent with a fireball expanding in a wind environment. A constant density environment is excluded by the data. This is one of the very few cases in which this conclusion can be drawn.