Search Publications
Geophysical implications of the long-wavelength topography of Rhea
Asmar, S. W.; Nimmo, F.; Thomas, P. C. +1 more
We use limb profiles to investigate the long-wavelength topography and topographic variance spectrum of Rhea. One-dimensional variance spectra show a break in slope at a wavelength of ≈300 km; a similar effect is seen on the Moon and may be a signature of an elastic lithosphere having a thickness Te ≈ 10 km. The implied heat flux is ∼15…
Multi-frequency study of Local Group supernova remnants. The curious case of the Large Magellanic Cloud SNR J0528-6714
Pietsch, W.; Haberl, F.; Filipović, M. D. +3 more
Context. The SNRs known in the Local Group show a variety of morphological structures that are relatively uncorrelated in the different wavelength bands. This variety is probably caused by the different conditions in the surrounding medium with which the remnant interacts.
Aims: Recent ATCA, XMM-Newton and MCELS observations of the Magellanic…
Racetrack and Bonnie Claire: southwestern US playa lakes as analogs for Ontario Lacus, Titan
Lorenz, Ralph D.; Hayes, Alex; Jackson, Brian
We note the geomorphological and meteorological processes at Racetrack Playa, Death Valley National Park, as analogs for those at Ontario Lacus on Titan. Although Ontario is ∼50× larger, the planforms of the two features are nearly identical, both are extremely flat, and are in environments where infrequent rainfall occurs against a climate, where…
Warm Coronal Rain on Young Solar Analog EK Draconis?
France, Kevin; Ayres, Thomas
We report a moderate-resolution, 1290-1430 Å spectrum of young solar analog EK Draconis (HD 129333: G1.5 V), obtained by Cosmic Origins Spectrograph on Hubble Space Telescope. The 20 minute observation, remarkably, captured two distinct "flares" in the Si IV 1400 Å doublet (T ~ 6 × 104 K); very broad profiles of Si IV and the C II 1335 …
Source counts at 15 microns from the AKARI NEP survey
Lee, H. M.; White, G. J.; Serjeant, S. +11 more
We present galaxy counts at 15 microns using the Japanese AKARI satelitte's NEP-deep and NEP-wide legacy surveys at the north ecliptic pole. The total number of sources detected are approximately 6700 and 10 700 down to limiting fluxes of 117 and 250 microJy (5 sigma) for the NEP-deep and NEP-wide survey respectively. We construct the Euclidean no…
Comparison study of magnetic flux ropes in the ionospheres of Venus, Mars and Titan
Russell, C. T.; Wei, H. Y.; Dougherty, M. K. +1 more
Magnetic flux ropes are created in the ionosphere of Venus and Mars during the interaction of the solar wind with their ionospheres and also at Titan during the interaction of the Saturnian magnetospheric plasma flow with Titan's ionosphere. The flux ropes at Venus and Mars were extensively studied from Pioneer Venus Orbiter and Mars Global Survey…
Herschel deep far-infrared counts through Abell 2218 cluster-lens
Kneib, J. -P.; Berta, S.; Magnelli, B. +35 more
Gravitational lensing by massive galaxy clusters allows study of the population of intrinsically faint infrared galaxies that lie below the sensitivity and confusion limits of current infrared and submillimeter telescopes. We present ultra-deep PACS 100 and 160 µm observations toward the cluster lens Abell 2218 to penetrate the Herschel conf…
HIFI observations of warm gas in DR21: Shock versus radiative heating
Boulanger, F.; France, K.; Teyssier, D. +35 more
Context. The molecular gas in the DR21 massive star formation region is known to be affected by the strong UV field from the central star cluster and by a fast outflow creating a bright shock. The relative contribution of both heating mechanisms is the matter of a long debate.
Aims: By better sampling the excitation ladder of various tracers …
Correlated optical/X-ray variability in the high-mass X-ray binary SAX J2103.5+4545
Zezas, A.; Reig, P.; Słowikowska, A. +1 more
SAX J2103.5+4545 is the Be/X-ray binary (BeX) with the shortest orbital period. It shows extended bright and faint X-ray states that last for a few hundred days. The main objective of this work is to investigate the relationship between the X-ray and optical variability and to characterize the spectral and timing properties of the bright and faint…
Nature of the ring current in Saturn's dayside magnetosphere
Persoon, A. M.; Coates, A. J.; Dougherty, M. K. +6 more
We employ magnetic field and plasma particle data from two equatorial passes of the Cassini spacecraft spanning the radial range between ∼3 and ∼20 RS to investigate the nature of the ring current in Saturn's dayside magnetosphere (RS is Saturn's equatorial radius, equal to 60,268 km). We examine plasma parameters obtained by…