Search Publications
Magnetic portraits of Tethys and Rhea
Russell, C. T.; Dougherty, M. K.; Khurana, Krishan K.
The Cassini spacecraft made a single flyby each of Saturn's icy moons Tethys and Rhea in late 2005. The magnetic field observations from these flybys provide unique portraits of the magnetic properties of these moons. These are the first observations of interactions of these inert moons with the sub-magnetosonic plasma of Saturn's magnetosphere. B…
Climate, weather, and north polar observations from the Mars Reconnaissance Orbiter Mars Color Imager
Bell, James F.; Thomas, Peter C.; Wolff, Michael J. +7 more
The Mars Reconnaissance Orbiter observes Mars from a nearly circular, polar orbit. From this vantage point, the Mars Color Imager extends the ∼5 Mars years record of Mars Global Surveyor global, visible-wavelength multi-color observations of meteorological events and adds measurements at three additional visible and two ultraviolet wavelengths. Ob…
Star formation efficiency in galaxy clusters
Andrade-Santos, F.; Cypriano, E. S.; Laganá, T. F. +1 more
Context: The luminous material in clusters of galaxies exists in two forms: the visible galaxies and the X-ray emitting intra-cluster medium. The hot intra-cluster gas is the major observed baryonic component of clusters, about six times more massive than the stellar component. The mass contained within visible galaxies is approximately 3% of the …
A Radio through X-Ray Study of the Jet/Companion-Galaxy Interaction in 3C 321
Lee, Julia C.; Kraft, Ralph P.; Birkinshaw, Mark +6 more
We present a multiwavelength study of the nucleus, environment, jets, and hot spots of the nearby FR II radio galaxy 3C 321, using new and archival data from MERLIN, the VLA, Spitzer, HST, and Chandra. An initially collimated radio jet extends northwest from the nucleus of its host galaxy and produces a compact knot of radio emission adjacent (in …
Line ratios from shocked cloudlets in planetary nebulae
Velázquez, P. F.; Raga, A. C.; Esquivel, A. +2 more
Context: Some PNe and PPNe show compact knots, travelling at high velocities away from the central sources.
Aims: We compute a number of models from which we obtain predictions of the emission-line spectrum, which can be compared with the spectra of the observed knots.
Methods: We completed a series of 11 axisymmetric simulations of an ini…
Electron circulation in Saturn's magnetosphere
Coates, A. J.; Mitchell, D. G.; Paranicas, C. +4 more
We present a model wherein electrons produced in Saturn's inner magnetosphere circulate through a combination of outward and inward motions driven by the centrifugal interchange instability and azimuthal motion through gradient and curvature drifts. Cool (<100 eV) electrons produced inside L ∼ 12 move slowly outward. To balance outflowing flux,…
Titan's diverse landscapes as evidenced by Cassini RADAR's third and fourth looks at Titan
Soderblom, L. A.; Ostro, S. J.; Janssen, M. A. +41 more
Cassini's third and fourth radar flybys, T7 and T8, covered diverse terrains in the high southern and equatorial latitudes, respectively. The T7 synthetic aperture radar (SAR) swath is somewhat more straightforward to understand in terms of a progressive poleward descent from a high, dissected, and partly hilly terrain down to a low flat plain wit…
Metallicity and Physical Conditions in the Magellanic Bridge
Keenan, F. P.; Smoker, J. V.; Lehner, N. +1 more
We present a new analysis of the diffuse gas in the Magellanic Bridge (R.A. gtrsim 3h) based on HST STIS E140M and FUSE spectra of two early-type stars lying within the Bridge and a QSO behind it. We derive the column densities of the H I (from Lyα), N I, O I, Ar I, Si II, S II, and Fe II of the gas in the Bridge. Using the atomic speci…
A search for the progenitors of two TypeIa Supernovae in NGC 1316
Maoz, Dan; Mannucci, Filippo
Recent evidence of a young progenitor population for many TypeIa supernovae (SNeIa) raises the possibility that evolved intermediate-mass progenitor stars may be detected in pre-explosion images. NGC 1316, a radio galaxy in the Fornax cluster, is a prolific producer of SNeIa, with four detected since 1980. We analyse Hubble Space Telescope (HST) p…
AKARI IRC Survey of the Large Magellanic Cloud: Outline of the Survey and Initial Results
Hasegawa, Tetsuo; Onaka, Takashi; Tamura, Motohide +13 more
We observed an area of 10deg2 of the Large Magellanic Cloud using the Infrared Camera (IRC) on board AKARI. The observations were carried out using five imaging filters (3, 7, 11, 15, and 24µm) and adispersion prism (2-5µm, λ / Δλ sim 20) equipped in the IRC. This paper describes an outline of our survey project, and present…