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Variations of the Mid-Infrared Emission Spectrum in Reflection Nebulae
Temi, Pasquale; Bregman, Jesse
Using spatial-spectral data cubes of reflection nebulae obtained by ISOCAM, we have observed a shift in the central wavelength of the 7.7 µm band within several reflection nebulae. This band, composed of components at 7.85 and 7.65 µm, shows a centroid shift from 7.75 µm near the edge of the nebulae to 7.65 µm toward the ce…
Mid-infrared detection of large longitudinal asymmetries in Io's SO 2 atmosphere
Lellouch, Emmanuel; Spencer, John R.; Richter, Matthew J. +4 more
We have observed about 16 absorption lines of the ν SO 2 vibrational band on Io, in disk-integrated 19-µm spectra taken with the TEXES high spectral resolution mid-infrared spectrograph at the NASA Infrared Telescope Facility in November 2001, December 2002, and January 2004. These are the first ground-based infrared observations …
A substellar companion around the intermediate-mass giant star HD 11977
Pasquini, L.; de Medeiros, J. R.; Hatzes, A. P. +6 more
We report the discovery of a substellar companion to the intermediate-mass star
Periodic intensity variations in global ENA images of Saturn
Krimigis, S. M.; Mitchell, D. G.; Paranicas, C. +4 more
During select time periods in orbit about Saturn, Cassini's Ion and Neutral Camera (INCA) has detected a periodic global ENA signal. Images taken during such periods reveal the presence of a rotating source component in addition to a steady-state component; both components have peak brightness in the midnight sector, when viewed from near dawn. We…
Jupiter Thermospheric General Circulation Model (JTGCM): Global structure and dynamics driven by auroral and Joule heating
Waite, J. H.; Gladstone, G. R.; Bougher, S. W. +1 more
A growing multispectral database plus recent Galileo descent measurements are being used to construct a self-consistent picture of the Jupiter thermosphere/ionosphere system. The proper characterization of Jupiter's upper atmosphere, embedded ionosphere, and auroral features requires the examination of underlying processes, including the feedbacks…
XMM-Newton observations of the Lockman Hole. III. A relativistic Fe line in the mean X-ray spectra of type-1 and type-2 AGN
Finoguenov, A.; Streblyanska, A.; Barcons, X. +3 more
Using the 770 ks XMM-Newton survey of the Lockman Hole field in combination with extensive optical identifications of the AGN population, we derive an average rest-frame spectrum of AGN types-1 and 2. The most prominent feature in the averaged spectrum is a strong fluorescent Fe line. In both type-1 and type-2 AGN, a clear relativistic line profil…
Fast coronal mass ejection environments and the production of solar energetic particle events
Vourlidas, A.; Kahler, S. W.
The search continues for coronal environmental factors that determine whether a fast coronal mass ejection (CME) results in a solar energetic particle (SEP) event at 1 AU. From a plot of peak 20 MeV SEP intensities versus associated CME speeds we select for comparison two groups of fast, wide, western hemisphere CMEs observed with the LASCO corona…
Reconstruction of the magnetotail current sheet structure using multi-point Cluster measurements
Balogh, A.; Zhang, T. L.; Nakamura, R. +7 more
In this paper we analyze the vertical structure of the magnetotail current sheet for a few intervals during which Cluster repeatedly crosses the neutral sheet due to fast flapping motion. They include fast flows with episodes of flow reversals. The curl, gradient and divergence of the magnetic field are estimated using linear gradient/curl estimat…
Detection of Water in the Shocked Gas Associated with IC 443: Constraints on Shock Models
Wang, Z.; Bergin, E. A.; Melnick, G. J. +5 more
We have used the Submillimeter Wave Astronomy Satellite (SWAS) to observe the ground-state 110-->101 transition of ortho-H2O at 557 GHz in three of the shocked molecular clumps associated with the supernova remnant IC 443. We also observed simultaneously the 487 GHz line (3,1-->3,2) of O2, the 492 …
HST/ACS Lyman α imaging of the nearby starburst ESO 338-IG04
Östlin, G.; Hayes, M.; Mas-Hesse, J. M. +3 more
ESO 338-IG04 (Tololo 1924-416) is a well-known, luminous (MV = -19.3) Blue Compact Galaxy in the local universe. Its complex morphology indicates a recent merger and/or close interaction, and it contains a central young starburst with compact star clusters of ages ≲ 40 Myr. The galaxy was imaged using the Advanced Camera for Surveys onb…