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Volcanic terrain and the possible periglacial formation of "excess ice" at the mid-latitudes of Utopia Planitia, Mars
Soare, R. J.; El-Maarry, M. R.; Conway, S. J. +2 more
At the mid-latitudes of Utopia Planitia (UP), Mars, a suite of spatially-associated landforms exhibit geomorphological traits that, on Earth, would be consistent with periglacial processes and the possible freeze-thaw cycling of water. The suite comprises small-sized polygonally-patterned ground, polygon-junction and -margin pits, and scalloped, r…
Corrugations and eccentric spirals in Saturn's D ring: New insights into what happened at Saturn in 1983
Hedman, M. M.; Burns, J. A.; Showalter, M. R.
Previous investigations of Saturn's outer D ring (73,200-74,000 km from Saturn's center) identified periodic brightness variations whose radial wavenumber increased linearly over time. This pattern was attributed to a vertical corrugation, and its temporal variability implied that some event - possibly an impact with interplanetary debris - caused…
Influence of a CME’s Initial Parameters on the Arrival of the Associated Interplanetary Shock at Earth and the Shock Propagational Model Version 3
Feng, X. S.; Zhao, X. H.
Predicting the arrival times of coronal mass ejections (CMEs) and their related waves at Earth is an important aspect of space weather forecasting. The Shock Propagation Model (SPM) and its updated version (SPM2), which use the initial parameters of solar flare-Type II burst events as input, have been developed to predict the shock arrival time. T…
UV contrasts and microphysical properties of the upper clouds of Venus from the UV and NIR VMC/VEx images
Markiewicz, Wojciech J.; Petrova, Elena V.; Shalygina, Oksana S.
The nature of UV contrasts observed on the upper cloud deck of Venus is still not known. To constrain better the properties of particles that may cause the UV contrasts, the phase dependences of brightness of the venusian clouds measured by the ultraviolet and near-infrared channels of the Venus Express Venus Monitoring Camera (VMC) in the UV dark…
Multi-frequency study of the newly confirmed supernova remnant MCSNR J0512-6707 in the Large Magellanic Cloud
Haberl, F.; Filipović, M. D.; Maggi, P. +5 more
Aims: We present a multi-frequency study of the supernova remnant MCSNR J0512-6707 in the Large Magellanic Cloud.
Methods: We used new data from XMM-Newton to characterise the X-ray emission and data from the Australian Telescope Compact Array, the Magellanic Cloud Emission Line Survey, and Spitzer to gain a picture of the environment in…
A new upper limit to the field-aligned potential near Titan
Coates, Andrew J.; Waite, J. Hunter; Jones, Geraint H. +1 more
Neutral particles dominate regions of the Saturn magnetosphere and locations near several of Saturn's moons. Sunlight ionizes neutrals, producing photoelectrons with characteristic energy spectra. The Cassini plasma spectrometer electron spectrometer has detected photoelectrons throughout these regions, where photoelectrons may be used as tracers …
Limits on Lyman Continuum Escape from z = 2.2 Hα-emitting Galaxies
Östlin, G.; Guaita, L.; Sandberg, A. +2 more
The leakage of Lyman continuum (LyC) photons from star-forming galaxies is an elusive parameter. When observed, it provides a wealth of information on star formation in galaxies and on the geometry of the interstellar medium, and puts constraints on the role of star-forming galaxies in the reionization of the universe. Hα-selected galaxies at z∼ 2…
Possibility of observable signatures of leptonium from astrophysical sources
Bland-Hawthorn, Joss; Ellis, S. C.
The formation of positronium in our Galaxy is well measured, and has led to important and unanswered questions on the origin of the positrons. In principle it should be possible to form analogous systems from µ and τ leptons, viz. true muonium and true tauonium. However the probability of formation for these systems is greatly reduced due to…
Not In Our Backyard: Spectroscopic Support for the CLASH z=11 Candidate MACS 0647-JD
Pirzkal, Nor; Donahue, Megan; Frye, Brenda L. +12 more
We report on our first set of spectroscopic Hubble Space Telescope observations of the z≈ 11 candidate galaxy, which is strongly lensed by the MACSJ 0647.7+7015 galaxy cluster. The three lensed images are faint and we show that these early slitless grism observations are of sufficient depth to investigate whether this high-redshift candidate, iden…
Infrared colour properties of nearby radio-luminous galaxies
Yang, Xiao-hong; Chen, Pei-sheng; Huang, Yan
By combining the data of the Two Micron All Sky Survey, the Wide-Field Infrared Survey Explorer and the AKARI satellite, we study the infrared colour properties of a sample of 2712 nearby radio-luminous galaxies (RLGs). These RLGs are divided into radio-loud (RL) active galactic nuclei (AGNs), mainly occurring at redshifts of 0.05 < z < 0.3 …