Search Publications
Modeling proton intensity gradients and radiation dose equivalents in the inner heliosphere using EMMREM: May 2003 solar events
Schwadron, N. A.; Desai, M. I.; Dayeh, M. A. +5 more
Solar energetic particles (SEPs) provide a significant radiation hazard for manned and unmanned interplanetary (IP) space missions. In order to estimate these hazards, it is essential to quantify the gradients of SEP intensities in the IP medium. The Earth-Moon-Mars Radiation Exposure Module (EMMREM) is a new project aimed at characterizing the ti…
The opposition and tilt effects of Saturn’s rings from HST observations
French, Richard G.; Salo, Heikki
The two major factors contributing to the opposition brightening of Saturn's rings are (i) the intrinsic brightening of particles due to coherent backscattering and/or shadow hiding on their surfaces, and (ii) the reduced interparticle shadowing when the solar phase angle α → 0°. We utilize the extensive set of Hubble Space Telescope observations …
The structured environments of embedded star-forming cores . PACS and SPIRE mapping of the enigmatic outflow source UYSO 1
Stecklum, B.; Henning, Th.; Krause, O. +6 more
The intermediate-mass star-forming core UYSO 1 has previously been found to exhibit intriguing features. While deeply embedded and previously only identified by means of its (sub-)millimeter emission, it drives two powerful, dynamically young, molecular outflows. Although the process of star formation has obviously started, the chemical compositio…
Deep GALEX Observations of the Coma Cluster: Source Catalog and Galaxy Counts
Hornschemeier, A. E.; Smith, R.; Arnouts, S. +5 more
We present a source catalog from a deep 26 ks Galaxy Evolution Explorer (GALEX) observation of the Coma cluster in the far-UV (FUV; 1530 Å) and near-UV (NUV; 2310 Å) wavebands. The observed field is centered ~0fdg9 (1.6 Mpc) southwest of the Coma core in a well-studied region of the cluster known as "Coma-3." The entire field is located within the…
Short gamma-ray bursts in the SPI-ACS INTEGRAL experiment
Minaev, P. Yu.; Pozanenko, A. S.; Loznikov, V. M.
We analyze short-duration gamma-ray bursts (T90<2 s) recorded in the SPI-ACS experiment of the INTEGRAL observatory. We found an extended emission in the averaged light curve of both short-duration gamma-ray bursts and unidentified short-duration events. We show that the fraction of short-duration gamma-ray bursts among all the gamma…
Groundwater processes in Hebes Chasma, Mars
Grindrod, Peter M.; Balme, Matthew R.
We describe a conceptual model of groundwater processes at Hebes Chasma, Mars, which can account for the distribution of hydrated minerals and their subsequent evolution. At Hebes Chasma, pressure gradients set up by the large central mound, Hebes Mensa, could cause groundwater to be sourced predominantly from beneath the central region, if such w…
Location and Magnetospheric Mapping of Saturn's Mid-latitude Infrared Auroral Oval
Cowley, Stanley W. H.; Melin, Henrik; Miller, Steve +2 more
Previous observations of Saturn's infrared aurorae have shown that a mid-latitude aurora exists significantly equatorward of the main auroral oval. Here, we present new results using data from four separate observing runs in 1998, 2003, 2008, and 2010. When combined, these provide a view of the mid-latitude aurora under a considerable range of vie…
Morphology and origin of an evaporitic dome in the eastern Tithonium Chasma, Mars
Baioni, Davide; Wezel, Forese Carlo
A 3.4 km-high, dome-shaped upland in eastern Tithonium Chasma (TC) coincides with areas containing abundant surface signatures of the sulphate mineral kiersite, as identified by the OMEGA image spectrometer. The dome has surface features on its summit, flanks, and at its base that were apparently formed by liquid water released from melting ice. T…
Associated spectral and temporal state transition of the bright ULXNGC1313 X-1
Rao, A. R.; Misra, R.; Dewangan, G. C. +1 more
Stellar mass black hole X-ray binaries exhibit X-ray spectral states which also have distinct and characteristic temporal properties. These states are believed to correspond to different accretion disc geometries. We present analysis of two XMM-Newton observations of the ultra-luminous X-ray source (ULX)NGC1313 X-1, which reveal that the system wa…
The Origin and Evolution of Titan
Choukroun, Mathieu; Lunine, Jonathan; Tobie, Gabriel +1 more
Titan was formed as a regular satellite in a disk that was the outgrowth of the formation of Saturn itself. Unlike the Jovian system, Titan is alone in terms of its size and mass, notart of a system gradational in density and hence rock abundance,erhaps reflecting a smaller disk and greater importance of stochastic events during satellite assembly…