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Electron heating in the exhaust of magnetic reconnection with negligible guide field
Guo, Ruilong; Chen, Li-Jen; Kistler, Lynn M. +3 more
Electron heating in the magnetic reconnection exhaust is investigated with particle-in-cell simulations, space observations, and theoretical analysis. Spatial variations of the electron temperature (Te) and associated velocity distribution functions (VDFs) are examined and understood in terms of particle energization and randomization p…
67P/C-G inner coma dust properties from 2.2 au inbound to 2.0 au outbound to the Sun
Lamy, P. L.; Fulle, M.; Rodrigo, R. +36 more
GIADA (Grain Impact Analyzer and Dust Accumulator) on-board the Rosetta space probe is designed to measure the momentum, mass and speed of individual dust particles escaping the nucleus of comet 67P/Churyumov-Gerasimenko (hereafter 67P). From 2014 August to 2016 June, Rosetta escorted comet 67P during its journey around the Sun. Here, we focus on …
Flare vs. Shock Acceleration of High-energy Protons in Solar Energetic Particle Events
Cliver, E. W.
Recent studies have presented evidence for a significant to dominant role for a flare-resident acceleration process for high-energy protons in large (“gradual”) solar energetic particle (SEP) events, contrary to the more generally held view that such protons are primarily accelerated at shock waves driven by coronal mass ejections (CMEs). The new …
The Detection of a Hot Molecular Core in the Large Magellanic Cloud with ALMA
Onaka, Takashi; Aikawa, Yuri; Shimonishi, Takashi +1 more
We report the first detection of a hot molecular core outside our Galaxy based on radio observations with ALMA toward a high-mass young stellar object (YSO) in a nearby low metallicity galaxy, the Large Magellanic Cloud (LMC). Molecular emission lines of CO, C17O, HCO+, H13CO+, H2CO, NO, SiO, …
Discovery of an exceptionally bright giant arc at z = 2.369, gravitationally lensed by the Planck cluster PSZ1 G311.65-18.48
Kneissl, R.; Dahle, H.; Aghanim, N. +14 more
As part of an all-sky follow-up of the Planck catalogue of Sunyaev-Zeldovich (SZ) cluster candidates detected in the first 14 months of data, we are observing cluster candidates in the southern sky in the optical imaging and spectroscopy through an ESO Large Programme. Inspection of ESO New Technology Telescope (NTT) R-and z-band imaging data from…
Observational Signatures of Coronal Loop Heating and Cooling Driven by Footpoint Shuffling
Velli, M.; Warren, H. P.; Ugarte-Urra, I. +4 more
The evolution of a coronal loop is studied by means of numerical simulations of the fully compressible three-dimensional magnetohydrodynamic equations using the HYPERION code. The footpoints of the loop magnetic field are advected by random motions. As a consequence, the magnetic field in the loop is energized and develops turbulent nonlinear dyna…
CMB lensing beyond the power spectrum: Cosmological constraints from the one-point probability distribution function and peak counts
Sherwin, Blake D.; Hill, J. Colin; Haiman, Zoltán +3 more
Unprecedentedly precise cosmic microwave background (CMB) data are expected from ongoing and near-future CMB stage III and IV surveys, which will yield reconstructed CMB lensing maps with effective resolution approaching several arcminutes. The small-scale CMB lensing fluctuations receive non-negligible contributions from nonlinear structure in th…
Dust emissivity in the star-forming filament OMC 2/3
Di Francesco, J.; Sadavoy, S. I.; Stutz, A. M. +3 more
We present new measurements of the dust emissivity index, β, for the high-mass, star-forming OMC 2/3 filament. We combined 160-500 µm data from Herschel with long-wavelength observations at 2 mm and fit the spectral energy distributions across a ≃2 pc long, continuous section of OMC 2/3 at 15 000 AU (0.08 pc) resolution. With these data, we …
Turbulence Heating ObserveR - satellite mission proposal
Escoubet, C. P.; Vainio, R.; Eastwood, J. P. +44 more
The Universe is permeated by hot, turbulent, magnetized plasmas. Turbulent plasma is a major constituent of active galactic nuclei, supernova remnants, the intergalactic and interstellar medium, the solar corona, the solar wind and the Earth's magnetosphere, just to mention a few examples. Energy dissipation of turbulent fluctuations plays a key r…
The Carina Nebula and Gum 31 molecular complex - I. Molecular gas distribution, column densities, and dust temperatures
Elia, Davide; Molinari, Sergio; Burton, Michael +6 more
We report high-resolution observations of the 12CO(1-0) and 13CO(1-0) molecular lines in the Carina Nebula and the Gum 31 region obtained with the 22-m Mopra telescope as part of The Mopra Southern Galactic Plane CO Survey. We cover 8 deg2 from l = 285° to 290°, and from b = -1.5° to +0.5°. The molecular gas column…