Search Publications
Charged nanograins in the Enceladus plume
Lewis, G. R.; Coates, A. J.; Thomsen, M. F. +12 more
There have been three Cassini encounters with the south-pole eruptive plume of Enceladus for which the Cassini Plasma Spectrometer (CAPS) had viewing in the spacecraft ram direction. In each case, CAPS detected a cold dense population of heavy charged particles having mass-to-charge (m/q) ratios up to the maximum detectable by CAPS (∼104
Star formation and disk properties in Pismis 24
Henning, Th.; van Boekel, R.; Fang, M. +6 more
Context. Circumstellar disks are expected to evolve quickly in massive young clusters harboring many OB-type stars. Two processes have been proposed to drive the disk evolution in such cruel environments: (1) gravitational interaction between circumstellar disks and nearby passing stars (stellar encounters); and (2) photoevaporation by UV photons …
Magnetospheric location of the equatorward prebreakup arc
Nakamura, R.; Sergeev, V.; Nishimura, Y. +3 more
We address the long-standing problem of the location and origin of the equatorwardmost Pre-Breakup auroral Arc (PBA) by combining energetic particle observations from NOAA Polar Operational Environmental Satellites (POES) overpasses of prebreakup arcs with auroral imaging and magnetospheric observations from the Time History of Events and Macrosca…
IDCS J1433.2+3306: An Infrared-selected Galaxy Cluster at z = 1.89
Dey, Arjun; Gonzalez, Anthony H.; Stanford, S. A. +6 more
We report the discovery of an IR-selected galaxy cluster in the IRAC Distant Cluster Survey (IDCS). New data from the Hubble Space Telescope spectroscopically confirm IDCS J1433.2+3306 at z = 1.89 with robust spectroscopic redshifts for seven members, two of which are based on the 4000 Å break. Detected emission lines such as [O II] and Hβ indicat…
Integral field spectroscopy of 2.0< z<2.7 submillimetre galaxies: gas morphologies and kinematics
Smail, Ian; Alexander, D. M.; Umehata, H. +8 more
We present 2D, integral field spectroscopy covering the rest-frame wavelengths of strong optical emission lines in nine submillimetre luminous galaxies (SMGs) at 2.0 < z < 2.7. The Gemini-North/Near-Infrared Integral Field Spectrograph (NIFS) and Very Large Telescope (VLT) Spectrograph for INtegral Field Observations in the Near Infrared (SI…
Timescales for electron quasi-linear diffusion by parallel and oblique lower-band chorus waves
Artemyev, A. V.; Agapitov, O. V.; Krasnoselskikh, V. V. +2 more
The loss of relativistic electrons from the Earth's radiation belts can be described in terms of the quasi-linear pitch angle diffusion by cyclotron-resonant waves, provided that their frequency spectrum is broad enough. Chorus waves at large wave-normal angles with respect to the magnetic field are often present in CLUSTER and THEMIS measurements…
Evidence of Wave Damping at Low Heights in a Polar Coronal Hole
Hahn, M.; Savin, D. W.; Landi, E.
We have measured the widths of spectral lines from a polar coronal hole using the Extreme Ultraviolet Imaging Spectrometer on board Hinode. Polar coronal holes are regions of open magnetic field and the source of the fast solar wind. We find that the line widths decrease at relatively low heights. Previous observations have attributed such decreas…
High velocity dispersion in a rare grand-design spiral galaxy at redshift z = 2.18
Erb, Dawn K.; Shapley, Alice E.; Steidel, Charles C. +3 more
Although grand-design spiral galaxies are relatively common in the local Universe, only one has been spectroscopically confirmed to lie at redshift z > 2 (HDFX 28; z = 2.011); and it may prove to be a major merger that simply resembles a spiral in projection. The rarity of spirals has been explained as a result of disks being dynamically `hot' …
Titan’s global crater population: A new assessment
Lorenz, R. D.; Neish, C. D.
We report a revised crater population for Titan using Cassini RADAR data through January 2010 (flyby T65), and make a size-dependent correction for the incomplete coverage (∼33%) using a Monte-Carlo model. Qualitatively, Titan’s landscape is more heavily cratered than Earth, but much less than Mars or Ganymede: the area fraction covered by craters…
Models of the global cloud structure on Venus derived from Venus Express observations
Irwin, P. G. J.; Drossart, P.; Piccioni, G. +6 more
Spatially-resolved near-infrared spectra from the Visible and Infrared Thermal Imaging Spectrometer (VIRTIS) on Venus Express have been used to derive improved models of the vertical structure and global distribution of cloud properties in the southern hemisphere of Venus. VIRTIS achieved the first systematic, global mapping of Venus at wavelength…