Search Publications
Convective cloud heights as a diagnostic for methane environment on Titan
Barth, Erika L.; Rafkin, Scot C. R.
The appearance of convective clouds in Titan's troposphere has been documented from ground-based observation for more than a decade. Cloud tops have been reported between 14 and 25 km. Higher resolution Cassini data have shown smaller portions of the cloud system can reach up to 42 km. We use the Titan Regional Atmospheric Modeling System (TRAMS) …
Interplanetary shock transmitted into the Earth's magnetosheath: Cluster and Double Star observations
Rème, H.; Cao, J. B.; Carr, C. M. +4 more
On day 7 May 2005, the plasma instruments on board Double Star TC1 and Cluster SC3 spacecraft register inside the magnetosheath, at 19:15:12 and 19:16:20 UT, respectively, a strong pressure pulse due to the impact of an interplanetary shock wave (IS) on the terrestrial bow shock. The analysis of this event provides clear and quantitative evidences…
Internal structure of Planum Boreum, from Mars advanced radar for subsurface and ionospheric sounding data
Plaut, J. J.; Safaeinili, A.; Aharonson, O. +1 more
An investigation of the internal structure of the ice-rich Planum Boreum (PB) deposit at the north pole of Mars is presented, using 178 orbits of Mars advanced radar for subsurface and ionospheric sounding data. For each radargram, bright, laterally extensive surface and subsurface reflectors are identified and the time delay between them is conve…
Electron temperatures in Saturn’s plasma disc
Wahlund, J. -E.; Gustafsson, G.
We present new results concerning electron temperature ( Te) mapping in the inner magnetosphere of Saturn (<7 R S). The data are obtained by the Langmuir Probe (LP) instrument of the Radio and Plasma Wave Science (RPWS) investigation on board Cassini. The study is based on the fourteen first orbits around Saturn, and focus…
A Far-ultraviolet Survey of M80: X-Ray Source Counterparts, Strange Blue Stragglers, and the Recovery of Nova T Sco
Zurek, David R.; Long, Knox S.; Knigge, Christian +2 more
Using the Advanced Camera for Surveys on Hubble Space Telescope, we have surveyed the far-ultraviolet (FUV) and near-ultraviolet (NUV) populations in the core region of M80. The color-magnitude diagram (CMD) reveals large numbers of blue and extreme horizontal branch stars and blue stragglers, as well as ≈60 objects lying in the region of the CMD …
Herschel observations of the hydroxyl radical (OH) in young stellar objects
de Graauw, Th.; Liseau, R.; Braine, J. +59 more
Aims: “Water In Star-forming regions with Herschel” (WISH) is a Herschel key program investigating the water chemistry in young stellar objects (YSOs) during protostellar evolution. Hydroxyl (OH) is one of the reactants in the chemical network most closely linked to the formation and destruction of H2O. High-temperature (T ⪆ 250 K)…
New X-ray Observations of the Geminga Pulsar Wind Nebula
Pavlov, George G.; Zavlin, Vyacheslav E.; Bhattacharyya, Sudip
Previous observations of the middle-aged pulsar Geminga with XMM-Newton and Chandra have shown an unusual pulsar wind nebula (PWN), with a 20'' long central (axial) tail directed opposite to the pulsar's proper motion and two 2' long, bent lateral (outer) tails. Here, we report on a deeper Chandra observation (78 ks exposure) and a few additional …
SDSS J150634.27+013331.6: the second compact elliptical galaxy in the NGC 5846 group
Chilingarian, Igor V.; Bergond, Gilles
We report the discovery of the second compact elliptical (cE) galaxy SDSS J150634.27+013331.6 in the nearby NGC 5846 group by the Virtual Observatory (VO) workflow. This object (MB = -15.98 mag, Re = 0.24 kpc) becomes the fifth cE where the spatially resolved kinematics and stellar populations can be obtained. We used archiva…
Mapping far-IR emission from the central kiloparsec of NGC 1097
Helou, G.; Roussel, H.; Murphy, E. J. +39 more
Using photometry of NGC 1097 from the Herschel PACS (Photodetector Array Camera and Spectrometer) instrument, we study the resolved properties of thermal dust continuum emission from a circumnuclear starburst ring with a radius ~900 pc. These observations are the first to resolve the structure of a circumnuclear ring at wavelengths that probe the …
The effects of an active galactic nucleus on host galaxy colour and morphology measurements
Ivison, R. J.; Koekemoer, A. M.; Faber, S. M. +11 more
We assess the effects of simulated active galactic nuclei (AGN) on the colour and morphology measurements of their host galaxies. To test the morphology measurements, we select a sample of galaxies not known to host AGN and add a series of point sources scaled to represent specified fractions of the observed V-band light detected from the resultin…