Theoretical astrophysics and plasma physics at RPC

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Optimizing stellarators for large flows

Plasma Physics and Controlled Fusion IOP Publishing 56:9 (2014) 094003

Authors:

Iván Calvo, Felix I Parra, J Arturo Alonso, José Luis Velasco
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Menus for Feeding Black Holes

Space Science Reviews Springer Nature 183:1-4 (2014) 163-187

Authors:

Bence Kocsis, Abraham Loeb
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Inboard and outboard radial electric field wells in the H- and I-mode pedestal of Alcator C-Mod and poloidal variations of impurity temperature

Nuclear Fusion IOP Publishing 54:8 (2014) 083017

Authors:

C Theiler, RM Churchill, B Lipschultz, M Landreman, DR Ernst, JW Hughes, PJ Catto, FI Parra, IH Hutchinson, ML Reinke, AE Hubbard, ES Marmar, JT Terry, JR Walk
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Reduction of core turbulence in I-mode plasmas in Alcator C-Mod

Nuclear Fusion IOP Publishing 54:8 (2014) 083019

Authors:

AE White, M Barnes, A Dominguez, M Greenwald, NT Howard, AE Hubbard, JW Hughes, DR Mikkelsen, FI Parra, ML Reinke, C Sung, J Walk, DG Whyte
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Interstellar medium. Pseudo-three-dimensional maps of the diffuse interstellar band at 862 nm.

Science (New York, N.Y.) 345:6198 (2014) 791-795

Authors:

Janez Kos, Tomaž Zwitter, Rosemary Wyse, Olivier Bienaymé, James Binney, Joss Bland-Hawthorn, Kenneth Freeman, Brad K Gibson, Gerry Gilmore, Eva K Grebel, Amina Helmi, Georges Kordopatis, Ulisse Munari, Julio Navarro, Quentin Parker, Warren A Reid, George Seabroke, Sanjib Sharma, Arnaud Siebert, Alessandro Siviero, Matthias Steinmetz, Fred G Watson, Mary EK Williams

Abstract:

The diffuse interstellar bands (DIBs) are absorption lines observed in visual and near-infrared spectra of stars. Understanding their origin in the interstellar medium is one of the oldest problems in astronomical spectroscopy, as DIBs have been known since 1922. In a completely new approach to understanding DIBs, we combined information from nearly 500,000 stellar spectra obtained by the massive spectroscopic survey RAVE (Radial Velocity Experiment) to produce the first pseudo-three-dimensional map of the strength of the DIB at 8620 angstroms covering the nearest 3 kiloparsecs from the Sun, and show that it follows our independently constructed spatial distribution of extinction by interstellar dust along the Galactic plane. Despite having a similar distribution in the Galactic plane, the DIB 8620 carrier has a significantly larger vertical scale height than the dust. Even if one DIB may not represent the general DIB population, our observations outline the future direction of DIB research.
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