Publications


Extended distribution functions for our Galaxy

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 449 (2015) 3479-3502

JL Sanders, J Binney


Bringing the Galaxy's dark halo to life

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 451 (2015) 639-650

T Piffl, Z Penoyre, J Binney


Observation of particle acceleration in laboratory magnetosphere

Physics of Plasmas 22 (2015)

Y Kawazura, Z Yoshida, M Nishiura, H Saitoh, Y Yano, T Nogami, N Sato, M Yamasaki, A Kashyap, T Mushiake

© 2015 AIP Publishing LLC. The self-organization of magnetospheric plasma is brought about by inward diffusion of magnetized particles. Not only creating a density gradient toward the center of a dipole magnetic field, the inward diffusion also accelerates particles and provides a planetary radiation belt with high energy particles. Here, we report the first experimental observation of a "laboratory radiation belt" created in the ring trap 1 device. By spectroscopic measurement, we found an appreciable anisotropy in the ion temperature, proving the betatron acceleration mechanism which heats particles in the perpendicular direction with respect to the magnetic field when particles move inward. The energy balance model, including the heating mechanism, explains the observed ion temperature profile.


Hamiltonian formalism of extended magnetohydrodynamics

Journal of Physics A: Mathematical and Theoretical 48 (2015)

HM Abdelhamid, Y Kawazura, Z Yoshida

© 2015 IOP Publishing Ltd. The extended magnetohydrodynamics (MHD) system, including the Hall effect and the electron inertia effect, has a Hamiltonian structure embodied by a noncanonical Poisson algebra on an infinite-dimensional phase space. A nontrivial part of the formulation is the proof of Jacobis identity for the Poisson bracket. We unearth a basic Lie algebra that generates the Poisson bracket. A class of similar Poisson algebra may be generated by the same Lie algebra, which encompasses the Hall MHD system and inertial MHD system.


A fast algorithm for estimating actions in triaxial potentials

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 447 (2015) 2479-2496

JL Sanders, J Binney


Secular diffusion in discrete self-gravitating tepid discs II. Accounting for swing amplification via the matrix method

ASTRONOMY & ASTROPHYSICS 584 (2015) ARTN A129

JB Fouvry, C Pichon, J Magorrian, PH Chavanis


RINGS AND RADIAL WAVES IN THE DISK OF THE MILKY WAY

ASTROPHYSICAL JOURNAL 801 (2015) ARTN 105

Y Xu, HJ Newberg, JL Carlin, C Liu, L Deng, J Li, R Schoenrich, B Yanny


Overview of MAST results

NUCLEAR FUSION 55 (2015) ARTN 104008

IT Chapman, J Adamek, RJ Akers, S Allan, L Appel, O Asunta, M Barnes, N Ben Ayed, T Bigelow, W Boeglin, J Bradley, J Bruenner, P Cahyna, M Carr, J Caughman, M Cecconello, C Challis, S Chapman, J Chorley, G Colyer, N Conway, WA Cooper, M Cox, N Crocker, B Crowley, G Cunningham, A Danilov, D Darrow, R Dendy, A Diallo, D Dickinson, S Diem, W Dorland, B Dudson, D Dunai, L Easy, S Elmore, A Field, G Fishpool, M Fox, E Fredrickson, S Freethy, L Garzotti, YC Ghim, K Gibson, J Graves, C Gurl, W Guttenfelder, C Ham, J Harrison, D Harting, E Havlickova, J Hawke, N Hawkes, T Hender, S Henderson, E Highcock, J Hillesheim, B Hnat, J Holgate, J Horacek, J Howard, B Huang, K Imada, O Jones, S Kaye, D Keeling, A Kirk, I Klimek, M Kocan, H Leggate, M Lilley, B Lipschultz, S Lisgo, YQ Liu, B Lloyd, B Lomanowski, I Lupelli, G Maddison, J Mailloux, R Martin, G McArdle, K McClements, B McMillan, A Meakins, H Meyer, C Michael, F Militello, J Milnes, AW Morris, G Motojima, D Muir, E Nardon, V Naulin, G Naylor, A Nielsen, M O'Brien, T O'Gorman, Y Ono, H Oliver, S Pamela, L Pangione, F Parra, A Patel, W Peebles, M Peng, R Perez, S Pinches, L Piron, M Podesta, M Price, M Reinke, Y Ren, C Roach, J Robinson, M Romanelli, V Rozhansky, S Saarelma, S Sangaroon, A Saveliev, R Scannell, A Schekochihin, S Sharapov, R Sharples, V Shevchenko, S Silburn, J Simpson, J Storrs, Y Takase, H Tanabe, H Tanaka, D Taylor, G Taylor, D Thomas, N Thomas-Davies, A Thornton, M Turnyanskiy, M Valovic, R Vann, N Walkden, H Wilson, LV Wyk, T Yamada, S Zoletnik, MAST Team, MASTU Team


Internal alignments of red versus blue discs in dark matter haloes

Monthly Notices of the Royal Astronomical Society 452 (2015) 4094-4110

VP Debattista, FC Van Den Bosch, R Roškar, T Quinn, B Moore, DR Cole

© 2015 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society. Large surveys have shown that red galaxies are preferentially aligned with their haloes, while blue galaxies have a more isotropic distribution. Since haloes generally align with their filaments, this introduces a bias in the measurement of the cosmic shear from weak lensing. It is therefore vitally important to understand why this difference arises. We explore the stability of different disc orientations within triaxial haloes. We show that, in the absence of gas, the disc orientation is most stable when its spin is along the minor axis of the halo. Instead when gas cools on to a disc, it is able to form in almost arbitrary orientation, including offthe main planes of the halo (but avoiding an orientation perpendicular to the halo's intermediate axis). Substructure helps gasless galaxies reach alignment with the halo faster, but has less effect on galaxies when gas is cooling on to the disc. Our results provide a novel and natural interpretation for why red, gas poor galaxies are preferentially aligned with their halo, while blue, star-forming, galaxies have nearly random orientations, without requiring a connection between galaxies' current star formation rate and their merger history.


Health effects of home energy efficiency interventions in England: a modelling study.

BMJ open 5 (2015) e007298-

I Hamilton, J Milner, Z Chalabi, P Das, B Jones, C Shrubsole, M Davies, P Wilkinson

To assess potential public health impacts of changes to indoor air quality and temperature due to energy efficiency retrofits in English dwellings to meet 2030 carbon reduction targets.Health impact modelling study.England.English household population.Three retrofit scenarios were modelled: (1) fabric and ventilation retrofits installed assuming building regulations are met; (2) as with scenario (1) but with additional ventilation for homes at risk of poor ventilation; (3) as with scenario (1) but with no additional ventilation to illustrate the potential risk of weak regulations and non-compliance.Primary outcomes were changes in quality adjusted life years (QALYs) over 50 years from cardiorespiratory diseases, lung cancer, asthma and common mental disorders due to changes in indoor air pollutants, including secondhand tobacco smoke, PM2.5 from indoor and outdoor sources, radon, mould, and indoor winter temperatures.The modelling study estimates showed that scenario (1) resulted in positive effects on net mortality and morbidity of 2241 (95% credible intervals (CI) 2085 to 2397) QALYs per 10,000 persons over 50 years follow-up due to improved temperatures and reduced exposure to indoor pollutants, despite an increase in exposure to outdoor-generated particulate matter with a diameter of 2.5 μm or less (PM₂.₅). Scenario (2) resulted in a negative impact of -728 (95% CI -864 to -592) QALYs per 10,000 persons over 50 years due to an overall increase in indoor pollutant exposures. Scenario (3) resulted in -539 (95% CI -678 to -399) QALYs per 10,000 persons over 50 years follow-up due to an increase in indoor exposures despite the targeting of pollutants.If properly implemented alongside ventilation, energy efficiency retrofits in housing can improve health by reducing exposure to cold and air pollutants. Maximising the health benefits requires careful understanding of the balance of changes in pollutant exposures, highlighting the importance of ventilation to mitigate the risk of poor indoor air quality.


Recognizing the fingerprints of the Galactic bar: a quantitative approach to comparing model (l, v) distributions to observations

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 446 (2015) 4186-4204

MC Sormani, J Magorrian


INTERMITTENCY AND ALIGNMENT IN STRONG RMHD TURBULENCE

ASTROPHYSICAL JOURNAL 807 (2015) ARTN 39

BDG Chandran, AA Schekochihin, A Mallet


Action-based distribution functions for spheroidal galaxy components

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 447 (2015) 3060-3068

L Posti, J Binney, C Nipoti, L Ciotti


Early flattening of dark matter cusps in dwarf spheroidal galaxies

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 446 (2015) 1820-1828

C Nipoti, J Binney


Inertial-range kinetic turbulence in pressure-anisotropic astrophysical plasmas

JOURNAL OF PLASMA PHYSICS 81 (2015) ARTN 325810501

MW Kunz, AA Schekochihin, CHK Chen, IG Abel, SC Cowley


Origin of the high v(los) feature in the Galactic bar

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 454 (2015) 3166-3184

M Aumer, R Schoenrich


KINEMATIC DETECTION OF THE GALACTIC NUCLEAR DISK

ASTROPHYSICAL JOURNAL LETTERS 812 (2015) ARTN L21

R Schoenrich, M Aumer, SE Sale


Marginal likelihoods of distances and extinctions to stars: computation and compact representation

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 448 (2015) 1738-1750

SE Sale, J Magorrian


Intrinsic rotation in tokamaks: theory

PLASMA PHYSICS AND CONTROLLED FUSION 57 (2015) ARTN 045002

FI Parra, M Barnes


Dependence of intrinsic rotation reversals on collisionality in MAST

NUCLEAR FUSION 55 (2015) ARTN 032003

JC Hillesheim, FI Parra, M Barnes, NA Crocker, H Meyer, WA Peebles, R Scannell, A Thornton, MAST Team

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