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Galactic cold cores. VII. Filament formation and evolution: Methods and observational constraints
Bernard, J. -P.; Juvela, M.; Marshall, D. J. +15 more
Context. The association of filaments with protostellar objects has made these structures a priority target in star formation studies. However, little is known about the link between filament properties and their local environment.
Aims: The datasets from the Herschel Galactic Cold cores key programme allow for a statistical study of filament…
Acceleration of cometary dust near the nucleus: application to 67P/Churyumov-Gerasimenko
Hartogh, Paul; Skorov, Yuri; Reshetnyk, Volodymyr +2 more
We present a model of cometary dust capable of simulating the dynamics within the first few tens of km of the comet surface. Recent measurements by the Grain Impact Analyser and Dust Accumulator and Cometary Secondary Ion Mass Analyser instruments on Rosetta show that the nucleus emits fluffy dust particles with porosities above 50 per cent and si…
Solving 3D relativistic hydrodynamical problems with weighted essentially nonoscillatory discontinuous Galerkin methods
Dietrich, Tim; Bugner, Marcus; Bernuzzi, Sebastiano +2 more
Discontinuous Galerkin (DG) methods coupled to weighted essentially nonoscillatory (WENO) algorithms allow high order convergence for smooth problems and for the simulation of discontinuities and shocks. In this work, we investigate WENO-DG algorithms in the context of numerical general relativity, in particular for general relativistic hydrodynam…
Observations of Oppositely Directed Umbral Wavefronts Rotating in Sunspots Obtained from the New Solar Telescope of BBSO
Chen, J.; Banerjee, D.; Su, J. T. +7 more
We study the umbral waves as observed by chromospheric imaging observations of two sunspots with the New Solar Telescope at the Big Bear Solar Observatory. We find that the wavefronts (WFs) rotate clockwise and form a one-armed spiral structure in the first sunspot, whereas two- and three-armed structures arise in the second sunspot where the WFs …
Star-forming dwarf galaxies in the Virgo cluster: the link between molecular gas, atomic gas, and dust
Riguccini, L.; De Looze, I.; Hunt, L. K. +11 more
We present 12CO(1-0) and 12CO(2-1) observations of a sample of 20 star-forming dwarfs selected from the Herschel Virgo Cluster Survey, with oxygen abundances ranging from 12 + log (O / H) ~ 8.1 to 8.8. CO emission is observed in ten galaxies and marginally detected in another one. CO fluxes correlate with the FIR 250 µm…
Searching for the 3.5 keV Line in the Stacked Suzaku Observations of Galaxy Clusters
Bulbul, Esra; Markevitch, Maxim; Smith, Randall K. +5 more
We perform a detailed study of the stacked Suzaku observations of 47 galaxy clusters, spanning a redshift range of 0.01-0.45, to search for the unidentified 3.5 keV line. This sample provides an independent test for the previously detected line. We detect a 2σ -significant spectral feature at 3.5 keV in the spectrum of the full sample. When the sa…
Vertical structure and optical properties of Titan's aerosols from radiance measurements made inside and outside the atmosphere
Karkoschka, Erich; Tomasko, Martin G.; Anderson, Carrie M. +1 more
Prompted by the detection of stratospheric cloud layers by Cassini's Composite Infrared Spectrometer (CIRS; see Anderson, C.M., Samuelson, R.E. [2011]. Icarus 212, 762-778), we have re-examined the observations made by the Descent Imager/Spectral Radiometer (DISR) in the atmosphere of Titan together with two constraints from measurements made outs…
Broad [C II] Line Wings as Tracer of Molecular and Multi-phase Outflows in Infrared Bright Galaxies
Lutz, D.; Genzel, R.; Poglitsch, A. +13 more
We report a tentative correlation between the outflow characteristics derived from OH absorption at 119 µm and [C II] emission at 158 µm in a sample of 22 local and bright ultraluminous infrared galaxies (ULIRGs). For this sample, we investigate whether [C II] broad wings are a good tracer of molecular outflows, and how the two tracers…
Aerosol properties in the upper haze of Venus from SPICAV IR data
Vandaele, A. C.; Montmessin, F.; Fedorova, A. +5 more
SPICAV IR, a channel of the SPICAV/SOIR suite of instruments onboard Venus Express spacecraft measured spectra in nadir and solar occultation modes in the range of 0.65-1.7 µm. We report results from 222 solar occultations observed from May 2006 to November 2014. The vertical resolution of measurements varies from 1 to 25 km depending on the…
Time Dependent Nonequilibrium Ionization of Transition Region Lines Observed with IRIS
Martínez-Sykora, Juan; De Pontieu, Bart; Hansteen, Viggo H. +1 more
The properties of nonstatistical equilibrium ionization of silicon and oxygen ions are analyzed in this work. We focus on five solar targets (quiet Sun; coronal hole; plage; quiescent active region, AR; and flaring AR) as observed with the Interface Region Imaging Spectrograph (IRIS). IRIS is best suited for this work owing to the high cadence (up…