Search Publications
Dust in Comet 103P/Hartley 2 coma during EPOXI mission
Lasue, J.; Sen, A. K.; Gupta, R. +3 more
The Deep Impact spacecraft flew by Comet 103P/Hartley 2 on 4 November 2010 (EPOXI mission). In situ observations are complemented by a systematic ground- and space-based observation campaign. In the present work, imaging polarimetry is used to emphasize different dust regions in the coma and follow their evolution over a period including the EPOXI…
Recent improvements of the Saturnian satellites atlases: Mimas, Enceladus, and Dione
Matz, K. -D.; Roatsch, Th.; Wählisch, M. +3 more
The Cassini Imaging Science Subsystem (ISS) acquired many high-resolution images (<1 km/pixel) of the Icy Saturnian satellites during the nominal mission of the Cassini spacecraft between 2004 and 2008. These images were used to create high-resolution mosaics of these satellites. The Cassini mission is expected to continue till 2017 and high-re…
A Novel Approach to Constrain the Mass Ratio of Minor Mergers in Elliptical Galaxies: Application to NGC 4889, the Brightest Cluster Galaxy in Coma
Ho, Luis C.; Huang, Song; Peng, Chien Y. +1 more
Minor mergers are thought to be important for the buildup and structural evolution of massive elliptical galaxies. In this work, we report the discovery of a system of four shell features in NGC 4889, one of the brightest members of the Coma cluster, using optical images taken with the Hubble Space Telescope and the Sloan Digital Sky Survey. The s…
Knob fields in the Terra Cimmeria/Terra Sirenum region of Mars: Stratigraphy, mineralogy and morphology
Neukum, Gerhard; Bishop, Janice L.; Wendt, Lorenz
We investigate the stratigraphy, morphology and mineralogy of five major knob fields in the region between Terra Cimmeria and Terra Sirenum on Mars based on HRSC, CTX, MOC and HiRISE imagery together with hyperspectral data from CRISM. The knob fields comprise Ariadnes Colles, Atlantis Chaos and Gorgonum Chaos and further, unnamed fields of mounds…
P/2010 A2 LINEAR. II. Dynamical dust modelling
Meech, K. J.; Hainaut, O. R.; Kleyna, J.
Estimation of the solar galactocentric distance and galactic rotation velocity from near-solar-circle objects
Bobylev, V. V.
We have tested the method of determining the solar Galactocentric distance R 0 and Galactic rotation velocity V 0 modified by Sofue et al. using near-solar-circle objects. The motion of objects relative to the local standard of rest has been properly taken into account. We show that when such young objects as star-forming reg…
Frozen Martian lahars? Evaluation of morphology, degradation and geologic development in the Utopia-Elysium transition zone
Pedersen, G. B. M.
Regional coverage of high-resolution data from the CTX camera has permitted new, detailed morphologic analysis of the enigmatic Utopia-Elysium flows which dominate the transition zone between Elysium volcanic province and Utopia Planitia. Based on topographic and morphologic analysis of the Galaxias region, this study supports the lahar hypothesis…
High-redshift Fermi blazars observed by GROND and Swift
Ghirlanda, G.; Ghisellini, G.; Tavecchio, F. +6 more
We observed five γ-ray-loud blazars at redshift greater than 2 with the X-Ray Telescope (XRT) and the UltraViolet and Optical Telescope (UVOT) on-board the Swift satellite, and the Gamma-Ray burst Optical Near-Infrared Detector (GROND) instrument. These observations were quasi-simultaneous, usually within a few hours. For four of these blazars, th…
A Redline Starburst: CO(2-1) Observations of an Eddington-limited Galaxy Reveal Star Formation at Its Most Extreme
Moustakas, J.; Rudnick, G. H.; Krips, M. +6 more
We report observations of the CO(2-1) emission of SDSS J1506+54, a compact (r e ≈ 135 pc) starburst galaxy at z = 0.6. SDSS J1506+54 appears to be forming stars close to the limit allowed by stellar radiation pressure feedback models: the measured L_IR/L^{\prime }_CO\approx 1500 is one of the highest measured for any galaxy. With its co…
Outflow channels with deltaic deposits in Ismenius Lacus, Mars
Mangold, Nicolas; Howard, Alan D.
A connected series of outflow channels in the Ismenius Lacus quadrangle are identified for the first time and characterized using High Resolution Stereo Camera images of Mars Express, the Context camera images of Mars Reconnaissance Orbiter and the topography of the Mars Observer Laser Altimeter. These channels (named Okavango Valles), which stret…