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83 papers · 1 filter
Herschel imaging of the dust in the Helix Nebula (NGC 7293)
G. C. Van de Steene, P. A. M. van Hoof, K. M. Exter +19
In our series of papers presenting the Herschel imaging of evolved planetary nebulae, we present images of the dust distribution in the Helix nebula (NGC 7293). Images at 70, 160,…
Formation of dense structures induced by filament collisions. Correlation of density, kinematics and magnetic field in the Pipe nebula
Pau Frau, Josep M. Girart, Felipe Alves +3
Context. The Pipe nebula is a molecular cloud that lacks star formation feedback and has a relatively simple morphology and velocity structure. This makes it an ideal target to tes…
Molecular shells in IRC+10216: tracing the mass loss history
J. Cernicharo, N. Marcelino, M. Agundez +1
The ejecta of thermally-pulsating AGB stars largely control the chemical evolution of galaxies. Yet, both, the mass-loss process and the gas chemical composition remain poorly unde…
Herschel Survey of Galactic OH+, H2O+, and H3O+: Probing the Molecular Hydrogen Fraction and Cosmic-Ray Ionization Rate
Nick Indriolo, D. A. Neufeld, M. Gerin +19
In diffuse interstellar clouds the chemistry that leads to the formation of the oxygen bearing ions OH+, H2O+, and H3O+ begins with the ionization of atomic hydrogen by cosmic rays…
Universal absorption of two-dimensional systems
T. Stauber, D. Noriega-Pérez, J. Schliemann
We discuss the optical conductivity of several non-interacting two-dimensional (2D) semiconducting systems focusing on gapped Dirac and Schrödinger fermions as well as on a system…
New N-bearing species towards OH231.8+4.2: HNCO, HNCS, HCN and NO
L. Velilla Prieto, C. Sánchez Contreras, J. Cernicharo +7
OH231.8+4.2 is a well studied O-rich CSE around an intermediate-mass evolved star that displays bipolar molecular outflows accelerated up to 400 km/s. OH231 also presents an except…