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Polar methane accumulation and rainstorms on Titan from simulations of the methane cycle
Brown, M. E.; Schaller, E. L.; Schneider, T. +1 more
Titan has a methane cycle akin to Earth's water cycle. It has lakes in polar regions, preferentially in the north; dry low latitudes with fluvial features and occasional rainstorms; and tropospheric clouds mainly (so far) in southern middle latitudes and polar regions. Previous models have explained the low-latitude dryness as a result of atmosphe…
Electron acceleration in the reconnection diffusion region: Cluster observations
André, M.; Vaivads, A.; Sahraoui, F. +10 more
We present one case study of magnetic islands and energetic electrons in the reconnection diffusion region observed by the Cluster spacecraft. The cores of the islands are characterized by strong core magnetic fields and density depletion. Intense currents, with the dominant component parallel to the ambient magnetic field, are detected inside the…
The Earliest Phases of Star Formation (EPoS): a Herschel key program. The precursors to high-mass stars and clusters
Henning, Th.; Krause, O.; Balog, Z. +14 more
Context. Stars are born deeply embedded in molecular clouds. In the earliest embedded phases, protostars emit the bulk of their radiation in the far-infrared wavelength range, where Herschel is perfectly suited to probe at high angular resolution and dynamic range. In the high-mass regime, the birthplaces of protostars are thought to be in the hig…
Direct Imaging Confirmation and Characterization of a Dust-enshrouded Candidate Exoplanet Orbiting Fomalhaut
Burrows, Adam; Currie, Thayne; Fukagawa, Misato +6 more
We present Subaru/IRCS J-band data for Fomalhaut and a (re)reduction of archival 2004-2006 HST/ACS data first presented by Kalas et al. We confirm the existence of a candidate exoplanet, Fomalhaut b, in both the 2004 and 2006 F606W data sets at a high signal-to-noise ratio. Additionally, we confirm the detection at F814W and present a new detectio…
Expanded Search for z ~ 10 Galaxies from HUDF09, ERS, and CANDELS Data: Evidence for Accelerated Evolution at z > 8?
Trenti, M.; Oesch, P. A.; Carollo, C. M. +7 more
We search for z ~ 10 galaxies over ~160 arcmin2 of Wide-Field Camera 3 (WFC3)/IR data in the Chandra Deep Field South, using the public HUDF09, Early Release Science, and CANDELS surveys, that reach to 5σ depths ranging from 26.9 to 29.4 in H 160 AB mag. z >~ 9.5 galaxy candidates are identified via J 125 - H
Probing the haze in the atmosphere of HD 189733b with Hubble Space Telescope/WFC3 transmission spectroscopy
Aigrain, S.; Pont, F.; Gibson, N. P. +6 more
We present Hubble Space Telescope near-infrared transmission spectroscopy of the transiting exoplanet HD 189733b, using the Wide Field Camera 3 (WFC3). This consists of time series spectra of two transits, used to measure the wavelength dependence of the planetary radius. These observations aim to test whether the Rayleigh scattering haze detected…
The Herschel Multi-tiered Extragalactic Survey: SPIRE-mm photometric redshifts
Aussel, H.; Elbaz, D.; Pérez-Fournon, I. +78 more
We investigate the potential of submm-mm and submm-mm-radio photometric redshifts using a sample of mm-selected sources as seen at 250, 350 and 500µm by the SPIRE instrument on Herschel. From a sample of 63 previously identified mm sources with reliable radio identifications in the Great Observatories Origins Deep Survey North and Lockman Ho…
Anisotropy in Space Plasma Turbulence: Solar Wind Observations
Horbury, T. S.; Chen, C. H. K.; Wicks, R. T.
The local magnetic field induces many types of anisotropy in plasma turbulence, changing the rate of energy transfer and affecting the propagation of energetic particles. It is challenging to measure this anisotropy in the solar wind due to the limited number of sampling points and measurement difficulties and many aspects remain poorly understood…
Particle Acceleration in Turbulence and Weakly Stochastic Reconnection
Lazarian, A.; Kowal, Grzegorz; de Gouveia Dal Pino, Elisabete M.
In this Letter we analyze the energy distribution evolution of test particles injected in three dimensional (3D) magnetohydrodynamic (MHD) simulations of different magnetic reconnection configurations. When considering a single Sweet-Parker topology, the particles accelerate predominantly through a first-order Fermi process, as predicted in and de…
An Integral Field Study of Abundance Gradients in nearby Luminous Infrared Galaxies
Rupke, D. S. N.; Kewley, L. J.; Dopita, M. A. +2 more
We present for the first time metallicity maps generated using data from the Wide Field Spectrograph on the ANU 2.3 m of 10 luminous infrared galaxies (LIRGs) and discuss the abundance gradients and distribution of metals in these systems. We have carried out optical integral field spectroscopy (IFS) of several LIRGs in various merger phases to in…