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Estimation of the Tilt of the Stellar Velocity Ellipsoid from RAVE and Implications for Mass Models
A. Siebert, O. Bienaymé, J. Binney +16
We present a measure of the inclination of the velocity ellipsoid at 1 kpc below the Galactic plane using a sample of red clump giants from the RAVE DR2 release. We find that the v…
Chemical evolution with radial mixing
Ralph Schoenrich, James Binney
Models of the chemical evolution of our Galaxy are extended to include radial migration of stars and flow of gas through the disc. The models track the production of both iron and…
Diffuse interstellar bands in RAVE Survey spectra
U. Munari, L. Tomasella, M. Fiorucci +19
We have used spectra of hot stars from the RAVE Survey in order to investigate the visibility and properties of five diffuse interstellar bands previously reported in the literatur…
The Radial Velocity Experiment (RAVE): second data release
T. Zwitter, A. Siebert, U. Munari +51
We present the second data release of the Radial Velocity Experiment (RAVE), an ambitious spectroscopic survey to measure radial velocities (RVs) and stellar atmosphere parameters…
Disassembling the Galaxy with angle-action coordinates
Paul J. McMillan, James J. Binney
Angle-action coordinates are used to study the relic of an N-body simulation of a self-gravitating satellite galaxy that was released on a short-period orbit within the disc of the…
Dynamical friction in modified Newtonian dynamics
C. Nipoti, L. Ciotti, J. Binney +1
We have tested a previous analytical estimate of the dynamical friction timescale in Modified Newtonian Dynamics (MOND) with fully non-linear N-body simulations. The simulations co…
Fitting orbits to tidal streams
James Binney
Recent years have seen the discovery of many tidal streams through the Galaxy. Relatively straightforward observations of a stream allow one to deduce three phase-space coordinates…
Accretion of gas onto nearby spiral galaxies
Filippo Fraternali, James Binney
We present evidence for cosmological gas accretion onto spiral galaxies in the local universe. The accretion is seen through its effects on the dynamics of the extra-planar neutral…
Galactic kinematics with RAVE data: I. The distribution of stars towards the Galactic poles
L. Veltz, O. Bienaymé, K. C. Freeman +16
We analyze the distribution of G and K type stars towards the Galactic poles using RAVE and ELODIE radial velocities, 2MASS photometric star counts, and UCAC2 proper motions. The c…
Is the sky falling? Searching for stellar streams in the local Milky Way disc in the CORAVEL and RAVE surveys
G. M. Seabroke, G. Gilmore, A. Siebert +19
We have searched for in-falling stellar streams on to the local Milky Way disc in the CORAVEL and RAVE surveys. The CORAVEL survey consists of local dwarf stars (Nordstrom et al. G…
Gaseous Haloes: Linking Galaxies to the IGM
Filippo Fraternali, James Binney, Tom Oosterloo +1
In recent years evidence has accumulated that nearby spiral galaxies are surrounded by massive haloes of neutral and ionised gas. These gaseous haloes rotate more slowly than the d…
The RAVE Survey: Constraining the Local Galactic Escape Speed
M. C. Smith, G. R. Ruchti, A. Helmi +20
We report new constraints on the local escape speed of our Galaxy. Our analysis is based on a sample of high velocity stars from the RAVE survey and two previously published datase…
The Radial Velocity Experiment (RAVE): first data release
M. Steinmetz, T. Zwitter, A. Siebert +51
We present the first data release of the Radial Velocity Experiment (RAVE), an ambitious spectroscopic survey to measure radial velocities and stellar atmosphere parameters (temper…
A Dynamical Model for the Extra-planar Gas in Spiral Galaxies
Filippo Fraternali, James Binney
Recent HI observations reveal that the discs of spiral galaxies are surrounded by extended gaseous haloes. This extra-planar gas reaches large distances (several kpc) from the disc…
The gaseous haloes of disc galaxies
F. Fraternali, T. Oosterloo, J. J. Binney +1
The study of gas outside the plane of disc galaxies is crucial to understanding the circulation of material within a galaxy and between galaxies and the intergalactic environment.…
Time variability of AGN and heating of cooling flows
Carlo Nipoti, James Binney
There is increasing evidence that AGN mechanical feedback is important in the energetics of cooling flows in galaxies and galaxy clusters. We investigate the implications of the va…
Rotation and anisotropy of galaxies revisited
James Binney
The use of the tensor virial theorem (TVT) as a diagnostic of anisotropic velocity distributions in galaxies is revisited. The TVT provides a rigorous global link between velocity…
Modelling the Galaxy for GAIA
James Binney
Techniques for the construction of dynamical Galaxy models should be considered essential infrastructure that should be put in place before GAIA flies. Three possible modelling tec…
The Cosmological Context of Extraplanar Gas
James Binney
I review evidence that galaxies form from gas that falls into potential wells cold, rather than from virialized gas, and that formation stops once an atmosphere of trapped virializ…
Nuclear properties of a sample of nearby spirals from STIS imaging
C. Scarlata, M. Stiavelli, M. Hughes +17
We present surface photometry for the central regions of a sample of 48 spiral galaxies (mostly unbarred and barred of types Sbc or Sc) observed with the Space Telescope Imaging Sp…
Black holes, cuspy atmospheres, and galaxy formation
James Binney
In cuspy atmospheres, jets driven by supermassive black holes (BHs) offset radiative cooling. The jets fire episodically, but often enough that the cuspy atmosphere does not move v…
Two-body relaxation in modified Newtonian dynamics
L. Ciotti, J. Binney
A naive extension to MOND of the standard computation of the two-body relaxation time Tb implies that Tb is comparable to the crossing time regardless of the number N of stars in t…
Cold filaments in galaxy clusters: effects of heat conduction
Carlo Nipoti, James Binney
We determine the critical size l_crit of a filament of cold (T~10^4 K) gas that is in radiative equilibrium with X-ray emitting gas at temperatures T_out~10^6 - 10^8 K. Filaments s…
Structural stability of cooling flows
Henrik Omma, James Binney
Three-dimensional hydrodynamical simulations are used to investigate the structural stability of cooling flows that are episodically heated by jets from a central AGN. The radial p…