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Disk-integrated Intensity Pseudomodes Measured by SOHO/VIRGO
Jiménez-Reyes, S. J.; García, R. A.; Jiménez, A.
The high-frequency spectrum above the acoustic cutoff frequency (νac) of the solar atmosphere has been observed in velocity measurements at low and high angular degrees and reveals significant evidence for the presence of pseudomodes characterized by their equally spaced signal. In this paper we study this region of the spectra using fo…
Central Blue Clumps in Elliptical Galaxies of the Hubble Ultra Deep Field
Elmegreen, Bruce G.; Elmegreen, Debra Meloy; Ferguson, Thomas E.
Elliptical galaxies larger than 10 pixels in the Hubble Ultra Deep Field (UDF) were surveyed for internal structure; 30 out of 100 in a sample of 884 morphologically classified galaxies exhibit large blue clumps near their centers. Unsharp-masked images of the clearest cases are presented. The distributions of the clumps on color-color and color-m…
Chandrayaan-1: Science goals
Bhandari, N.
The primary objectives of the Chandrayaan-1 mission are simultaneous chemical, mineralogical and topographic mapping of the lunar surface at high spatial resolution. These data should enable us to understand compositional variation of major elements, which in turn, should lead to a better understanding of the stratigraphic relationships between va…
Magnetic Clouds Observed at 1 Au During the Period 2000-2003
Nieves-Chinchilla, T.; Hidalgo, M. A.; Sequeiros, J.
In this work we have performed a systematic study of all the magnetic clouds identified in the time interval 2000-2003. The study shows that the non force-free model of Hidalgo is a good approximation to the magnetic topology of the MCs in the interplanetary medium. This conclusion is reached based on the good fits obtained with the model for most…
W Hya through the eye of Odin. Satellite observations of circumstellar submillimetre H2O line emission
Olofsson, H.; Justtanont, K.; Larsson, B. +10 more
We present Odin observations of the AGB star W Hya in the ground-state transition of ortho-H{2}O, 1{10}-101, at 557 GHz. The line is clearly of circumstellar origin. Radiative transfer modelling of the water lines observed by Odin and ISO results in a mass-loss rate of (2.5±0.5)×10-7 M⊙ yr-1, and a circu…
Solar wind from the coronal hole boundaries
Geiss, J.; McComas, D. J.; Schwadron, N. A. +3 more
Recent studies using in situ observations established that the interface between fast and slow wind in interplanetary space has two distinct parts: a smoothly varying boundary layer flow that flanks fast wind from coronal holes and a sharper plasma discontinuity between intermediate and slow solar wind. Other studies using in situ observations and…
HST/ACS imaging of a Balmer-dominated shock in Kepler’s supernova remnant
Blair, William P.; Rudnick, Lawrence; Harrus, Ilana M. +3 more
Optical images of Kepler’s supernova remnant obtained at two epochs, in 1987 at Las Campanas Observatory and in 2003 with the HST Advanced Camera for Surveys, show the motion of the Balmer-dominated forward shock. The measured proper motion, combined with estimates of the shock velocity, is used to derive a distance of 3.9-0.9+1.4 kpc to the remna…
To see or not to see a bow shock. Identifying bow shocks with Hα allsky surveys
Brown, D.; Bomans, D. J.
OB-stars have the highest luminosities and strongest stellar winds of all stars, which enables them to interact strongly with their surrounding ISM, thus creating bow shocks. These offer us an ideal opportunity to learn more about the ISM. They were first detected and analysed around runaway OB-stars using the IRAS allsky survey by van Buren et al…
Supernova Remnants in the Magellanic Clouds. V. The Complex Interior Structure of the N206 Supernova Remnant
Gruendl, R. A.; Chu, Y. -H.; Guerrero, M. A. +4 more
The N206 supernova remnant (SNR) in the Large Magellanic Cloud has long been considered a prototypical ``mixed morphology'' SNR. Recent observations, however, have added a new twist to this familiar plot: an elongated, radially oriented radio feature seen in projection against the SNR face. Utilizing the high resolution and sensitivity available w…
Major episodes of the hydrologic history in the region of Hesperia Planum, Mars
Neukum, G.; Marinangeli, L.; Ivanov, M. A. +5 more
The High Resolution Stereo Color camera (HRSC) data over Hesperia Planum and its surroundings reveal important details of geologic episodes and water-related processes in this region. (1) The Noachian fluvial events of Hesperia Planum depression included accumulation of water and formation of a water/ice reservoir there. Later, the reservoir was d…