Search Publications
Calibration of RAVE distances to a large sample of Hipparcos stars
Francis, Charles
A magnitude-limited population of 18 808 Hipparcos stars is used to calibrate distances for 52 794 RAdial Velocity Experiment (RAVE) stars, including dwarfs, giants and pre-main-sequence stars. I give treatments for a number of types of bias affecting calculation, including bias from the non-linear relationship between the quantity of interest (e.…
Dynamical processes in space: Cluster results
Escoubet, C. P.; Goldstein, M. L.; Taylor, M. G. G. T. +4 more
After 12 years of operations, the Cluster mission continues to successfully fulfil its scientific objectives. The main goal of the Cluster mission, comprised of four identical spacecraft, is to study in three dimensions small-scale plasma structures in key plasma regions of the Earth's environment: solar wind and bow shock, magnetopause, polar cus…
Timescale for oceans in the past of Titan
McKay, Christopher P.; Larsson, Richard
We estimate the past extent of liquid on the surface of Titan as a function of time assuming the current rate of destruction of methane and no sources or subsurface sinks. As methane increases for increasing past time the polar lakes expand equatorward. We use a spherical harmonics model for the surface topography to compute the fraction of the su…
On the progenitor of the type IC SN 2013dk in the antennae galaxies.
Smartt, S. J.; Benetti, S.; Maund, J. R. +7 more
We report the results of our search for the progenitor candidate of SN 2013dk, a Type Ic supernova (SN) that exploded in the Antennae galaxy system. We compare pre-explosion Hubble Space Telescope (HST) archival images with SN images obtained using adaptive optics at the ESO Very Large Telescope. We isolate the SN position to within 3σ uncertainty…
Neutral gas in Lyman-alpha emitting galaxies Haro 11 and ESO 338-IG04 measured through sodium absorption
Schaerer, D.; Östlin, G.; Hayes, M. +4 more
Context. The Lyman alpha emission line of neutral hydrogen is an important tool for finding galaxies at high redshift, thus for probing the structure of the early universe. However, the resonance nature of the line and its sensitivity to dust and neutral gas is still not fully understood.
Aims: We present measurements of the velocity, coverin…
WISE J233237.05-505643.5: A Double-peaked, Broad-lined Active Galactic Nucleus with a Spiral-shaped Radio Morphology
Tsai, Chao-Wei; Kong, Albert K. H.; Norris, Ray P. +14 more
We present radio continuum mapping, optical imaging, and spectroscopy of the newly discovered double-peaked, broad-lined active galactic nucleus (AGN) WISE J233237.05-505643.5 at redshift z = 0.3447. This source exhibits an FR-I and FR-II hybrid morphology, characterized by a bright core, jet, and Doppler-boosted lobe structures in Australian Tele…
Measurements of Anisotropic Ion Temperatures, Non-thermal Velocities, and Doppler Shifts in a Coronal Hole
Hahn, M.; Savin, D. W.
We present a new diagnostic allowing one to measure the anisotropy of ion temperatures and non-thermal velocities, as well as Doppler shifts with respect to the ambient magnetic field. This method provides new results, as well as an independent test for previous measurements obtained with other techniques. Our spectral data come from observations …
Oxygen nightglow emissions of Venus: Vertical distribution and collisional quenching
Piccioni, G.; Gérard, J. -C.; Soret, L. +1 more
We compare the altitude of three O2 night airglow emissions observed at the limb of Venus by the VIRTIS spectral imager with those values predicted by a model accounting for the different radiative lifetimes and collisional deactivation of the upper O2 states. The O and CO2 density profiles are based on remote sens…
A Lyman Break Galaxy in the Epoch of Reionization from Hubble Space Telescope Grism Spectroscopy
Dickinson, Mark; Gardner, Jonathan P.; Hathi, Nimish +28 more
We present observations of a luminous galaxy at z = 6.573—the end of the reionization epoch—which has been spectroscopically confirmed twice. The first spectroscopic confirmation comes from slitless Hubble Space Telescope Advanced Camera for Surveys grism spectra from the PEARS survey (Probing Evolution And Reionization Spectroscopically), which s…
Multichromatic colour-magnitude diagrams of the globular cluster NGC 6366
Kepler, S. O.; Bonatto, C.; Campos, Fabíola +1 more
We present multichromatic isochrone fits to the colour-magnitude data of the globular cluster NGC 6366, based on Hubble Space Telescope Advanced Camera for Surveys/Wide Field Channel and Southern Astrophysical Research photometric data. We corrected the photometric data for differential reddening and calculated the mean ridge line of the colour-ma…