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Chemodynamical models of our Galaxy
James Binney, Eugene Vasiliev
A chemodynamical model of our galaxy is fitted to data from DR17 of the APOGEE survey supplemented with data from the StarHorse catalogue and gaia DR3. Dynamically, the model is de…
Our Galaxy's youngest disc
Chengdong Li, James Binney
We investigate the structure of our Galaxy's young stellar disc by fitting the distribution functions (DFs) of a new family to five-dimensional Gaia data for a sample of …
Self-consistent models of our Galaxy
James Binney, Eugene Vasiliev
A new class of models of stellar discs is introduced and used to build a self-consistent model of our Galaxy. The model is defined by the parameters that specify the action-based d…
The Gaia-ESO Public Spectroscopic Survey: Implementation, data products, open cluster survey, science, and legacy
S. Randich, G. Gilmore, L. Magrini +161
In the last 15 years different ground-based spectroscopic surveys have been started (and completed) with the general aim of delivering stellar parameters and elemental abundances f…
Modelling the stellar halo with RR-Lyrae stars
Chengdong Li, James Binney
A seven-parameter distribution function (DF) is fitted to RR-Lyrae stars for which only astrometric data are available. The observational data are predicted by the DF in…
Modes of a stellar system II: non-ergodic systems
Jun Yan Lau, James Binney
An equation is derived for the energy of a small disturbance in a system that is generated by a distribution function (DF) of the form $f(\vJ)$ -- most galaxies and star clusters c…
Probabilistic distribution functions
Jun Yan Lau, James Binney
Observed clusters should be modelled by considering the distribution function to be a random variable that quantifies the degree of excitation of the system's normal modes. A syste…
Modes of a stellar system I: ergodic systems
Jun Yan Lau, James Binney
The excursions of star clusters and galaxies around statistical equilibria are studied. For a stable ergodic model Antonov's Hermitian operator on six-dimensional phase space has t…
Angle-action variables for orbits trapped at a Lindblad resonance
James Binney
The conventional approach to orbit trapping at Lindblad resonances via a pendulum equation fails when the parent of the trapped orbits is too circular. The problem is explained and…
Trapped orbits and solar-neighbourhood kinematics
James Binney
Torus mapping yields constants of motion for stars trapped at a resonance. Each such constant of motion yields a system of contours in velocity space at the Sun and neighbouring po…
Modelling our Galaxy
James Binney
Dynamical models will be key to exploitation of the incoming flood data for our Galaxy. Modelling techniques are reviewed with an emphasis on f(J) modelling.
Flattened stellar systems based on distribution functions depending on actions
Raffaele Pascale, James Binney, Carlo Nipoti
We address an issue that arises when self-consistently flattened dynamical stellar systems are constructed by adopting a distribution function (DF) that depends on the action integ…
The shearing sheet and swing amplification revisited
James Binney
The principal results of the classic analysis of the shearing sheet and swing amplification by Julian & Toomre (1966) are re-derived in a more accessible way and then used to gain…
Relaxation of spherical stellar systems
Jun Yan Lau, James Binney
10,000 simulations of 1000-particle realisations of the same cluster are computed by direct force summation. Over three crossing times the original Poisson noise is amplified more…
Action-based models for dwarf spheroidal galaxies and globular clusters
Raffaele Pascale, James Binney, Carlo Nipoti +1
A new family of self-consistent DF-based models of stellar systems is explored. The stellar component of the models is described by a distribution function (DF) depending on the ac…
Models of rotating coronae
Mattia C. Sormani, Emanuele Sobacchi, Gabriele Pezzulli +2
Fitting equilibrium dynamical models to observational data is an essential step in understanding the structure of the gaseous hot haloes that surround our own and other galaxies. H…
The GALAH survey and Gaia DR2: dissecting the stellar disc's phase space by age, action, chemistry and location
Joss Bland-Hawthorn, Sanjib Sharma, Thor Tepper-Garcia +24
We use the second data releases of the ESA Gaia astrometric survey and the high-resolution GALAH spectroscopic survey to analyse the structure of our Galaxy's disc components. With…
The origin of the Gaia phase-plane spiral
James Binney, Ralph Schoenrich
A simple model is presented of the formation of the spiral the (z,v_z) phase plane of solar-neighbourhood stars that was recently discovered in Gaia data. The key is that the frequ…
Correlations between age, kinematics, and chemistry as seen by the RAVE survey
Jennifer Wojno, Georges Kordopatis, Matthias Steinmetz +20
We explore the connections between stellar age, chemistry, and kinematics across a Galactocentric distance of , using a sample of inte…
Revisiting relaxation in globular clusters
Chris Hamilton, Jean-Baptiste Fouvry, James Binney +1
The classical theory of cluster relaxation is unsatisfactory because it involves the Coulomb logarithm. The Balescu-Lenard (BL) equation provides a rigorous alternative that has no…
Action-based dynamical models of dwarf spheroidal galaxies: application to Fornax
Raffaele Pascale, Lorenzo Posti, Carlo Nipoti +1
We present new dynamical models of dwarf spheroidal galaxies (dSphs) in which both the stellar component and the dark halo are described by analytic distribution functions that dep…
Orbital tori for non-axisymmetric galaxies
James Binney
Our Galaxy's bar makes the Galaxy's potential distinctly non-axisymmetric. All orbits are affected by non-axisymmetry, and significant numbers are qualitatively changed by being tr…
Is the Milky Way still breathing? RAVE-Gaia streaming motions
I. Carrillo, I. Minchev, G. Kordopatis +26
We use data from the Radial Velocity Experiment (RAVE) and the Tycho-Gaia astrometric solution catalogue (TGAS) to compute the velocity fields yielded by the radial (VR), azimuthal…
Distribution functions for resonantly trapped orbits in the Galactic disc
Giacomo Monari, Benoit Famaey, Jean-Baptiste Fouvry +1
The present-day response of a Galactic disc stellar population to a non-axisymmetric perturbation of the potential has previously been computed through perturbation theory within t…