Search Publications
Atmospheres and Plasma Interactions at Saturn's Largest Inner Icy Satellites
Saur, Joachim; Strobel, Darrell F.
We explore the possible existence of atmospheres on Saturn's icy satellites, Mimas, Enceladus, Tethys, Dione, and Rhea. Only the most massive satellite, Rhea, has the potential to hold a thin oxygen atmosphere/exosphere. The masses of the other satellites are too small to retain gravitationally atmospheres in the presence of large thermal escape r…
Rotational Tomography For 3d Reconstruction Of The White-Light And Euv Corona In The Post-Soho Era
Frazin, Richard A.; Kamalabadi, Farzad
Improving our understanding of the mechanisms that energize the solar wind and heat structures in the solar corona requires the development of empirical methods that can determine the three-dimensional (3D) temperature and density distributions with as much spatial and temporal resolution as possible. This paper reviews the solar rotational tomogr…
Analysis of CO2 non-LTE emissions at 4.3µm in the Martian atmosphere as observed by PFS/Mars Express and SWS/ISO
López-Puertas, M.; López-Moreno, J. J.; Lellouch, E. +5 more
Daytime nadir spectra of the Martian atmosphere taken by the planetary Fourier spectrometer/Mars Express (PFS) and by the infrared space observatory (ISO) in the 4.3µm region are analyzed using a theoretical non-LTE model of the CO2 infrared emissions in that atmosphere. Averaged spectra from these instruments show a double peak s…
Models of Five Absorption-Line Systems along the Line of Sight Toward PG 0117+213
Charlton, Jane C.; Masiero, Joseph R.; Churchill, Christopher W. +2 more
We present our investigation into the physical conditions of the gas in five intervening quasar absorption-line systems along the line of sight toward the quasar PG 0117+213, with redshifts of z=0.57, 0.72, 1.04, 1.32, and 1.34. Photoionization modeling of Hubble Space Telescope, Keck I, and Palomar data, using the code Cloudy, is employed to deri…
XMM-Newton spectroscopy of the metal depleted T Tauri star TWA 5
Neuhäuser, R.; Peres, G.; Stelzer, B. +2 more
We present results of X-ray spectroscopy for
The 90-110 µm dust feature in low to intermediate mass protostars: Calcite?
Maret, S.; Ceccarelli, C.; Chiavassa, A. +2 more
We present ISO spectra between 60 and 180 µm of 32 protostars of low to intermediate mass. About half of the spectra present a dust feature between ~90 and ~110 µm. We describe the observational characteristics of this feature, which seems to be due to one single carrier. In Class 0 sources the feature peaks around 100 µm, while …
The XMM-Newton Ω project
Bernard, J. -P.; Nichol, R. C.; Romer, A. K. +10 more
We study the gas mass fraction behavior in distant galaxy clusters observed within the XMM-Newton Ω project. The typical gas mass fraction fgas shape of high redshift galaxy clusters follows the global shape inferred at low redshift quite well, once scaled appropriately: the gas mass fraction increases with radius and flattens outward. …
A Starfish Preplanetary Nebula: IRAS 19024+0044
Sahai, Raghvendra; Sánchez Contreras, Carmen; Morris, Mark
Using the Hubble Space Telescope, we have imaged the OH/IR star IRAS 19024+0044 (I19024) at 0.6, 0.8, 1.1, and 1.6 µm, as part of our surveys of candidate preplanetary nebulae. The images show a multipolar nebula of size ~3.7"×2.3", with at least six elongated lobes emanating from the center of the nebula. Two of the lobes show limb-brighten…
Decay properties of the X-ray afterglows of gamma-ray bursts
Gendre, B.; Boër, M.
We present a set of seventeen Gamma-Ray Bursts (GRBs) with known redshifts and X-ray afterglow emission. We apply cosmological corrections in order to compare their fluxes normalized at a redshift of 1. Two classes of GRB can be defined using their X-ray afterglow light curves. We show that the brightest afterglows seem to decay faster than the di…
Diffuse X-Rays from the Arches and Quintuplet Clusters
Melia, Fulvio; Wang, Q. Daniel; Rockefeller, Gabriel +1 more
The origin and initial mass function of young stellar clusters near the Galactic center are still poorly understood. Two of the more prominent ones, the Arches and Quintuplet clusters, may have formed from a shock-induced burst of star formation, given their similar age and proximity to each other. Their unusual mass distribution, however, may be …