Supernova-driven gas accretion in the Milky Way

Monthly Notices of the Royal Astronomical Society (2011)

Authors:

A Marasco, F Fraternali, JJ Binney

The detection and treatment of distance errors in kinematic analyses of stars

Monthly Notices of the Royal Astronomical Society (2011)

Authors:

R Schönrich, J Binney, M Asplund

Transport bifurcation induced by sheared toroidal flow in tokamak plasmas

PHYSICS OF PLASMAS 18:10 (2011) ARTN 102304

Authors:

EG Highcock, M Barnes, FI Parra, AA Schekochihin, CM Roach, SC Cowley

The Dawning of the Stream of Aquarius in RAVE

ArXiv 1012.2127 (2010)

Authors:

Mary EK Williams, Matthias Steinmetz, Sanjib Sharma, Joss Bland-Hawthorn, Roelof S de Jong, George M Seabroke, Amina Helmi, Kenneth C Freeman, James Binney, Ivan Minchev, Olivier Bienaymé, Rachel Campbell, Jon P Fulbright, Brad K Gibson, Gerard F Gilmore, Eva K Grebel, Ulisse Munari, Julio F Navarro, Quentin A Parker, Warren Reid, Arnaud Siebert, Alessandro Siviero, Fred G Watson, Rosemary FG Wyse, Tomaz Zwitter

Abstract:

We identify a new, nearby (0.5 < d < 10 kpc) stream in data from the RAdial Velocity Experiment (RAVE). As the majority of stars in the stream lie in the constellation of Aquarius we name it the Aquarius Stream. We identify 15 members of the stream lying between 30 < l < 75 and -70< b <-50, with heliocentric line-of-sight velocities V_los~-200 km/s. The members are outliers in the radial velocity distribution, and the overdensity is statistically significant when compared to mock samples created with both the Besan\c{c}on Galaxy model and newly-developed code Galaxia. The metallicity distribution function and isochrone fit in the log g - T_eff plane suggest the stream consists of a 10 Gyr old population with [m/H]~-1.0. We explore relations to other streams and substructures, finding the stream cannot be identified with known structures: it is a new, nearby substructure in the Galaxy's halo. Using a simple dynamical model of a dissolving satellite galaxy we account for the localization of the stream. We find that the stream is dynamically young and therefore likely the debris of a recently disrupted dwarf galaxy or globular cluster. The Aquarius stream is thus a specimen of ongoing hierarchical Galaxy formation, rare for being right in the solar suburb.

Comment on "nonlinear gyrokinetic theory with polarization drift" [Phys. Plasmas 17, 082304 (2010)]

Physics of Plasmas 17:12 (2010)

Authors:

S Leerink, FI Parra, JA Heikkinen

Abstract:

In this comment, we show that by using the discrete particle distribution function the changes of the phase-space volume of gyrocenter coordinates due to the fluctuating E×B velocity do not explicitly appear in the Poisson equation and the [Sosenko, Phys. Scr. 64, 264 (2001)] result is recovered. It is demonstrated that there is no contradiction between the work presented by Sosenko and the work presented by [Wang, Phys. Plasmas 17, 082304 (2010)]. © 2010 American Institute of Physics.