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The Mass-Concentration-Redshift Relation of Cold Dark Matter Halos
Aaron D. Ludlow, Julio F. Navarro, Raul E. Angulo +4
We use the Millennium Simulation series to investigate the mass and redshift dependence of the concentration of equilibrium cold dark matter (CDM) halos. We extend earlier work on…
The large-scale structure of the halo of the Andromeda Galaxy Part I: global stellar density, morphology and metallicity properties
Rodrigo A. Ibata, Geraint F. Lewis, Alan W. McConnachie +14
We present an analysis of the large-scale structure of the halo of the Andromeda galaxy, based on the Pan-Andromeda Archeological Survey (PAndAS), currently the most complete map o…
The Orbital Ellipticity of Satellite Galaxies and the Mass of the Milky Way
Christopher Barber, Else Starkenburg, Julio Navarro +2
We use simulations of Milky Way-sized dark matter haloes from the Aquarius Project to investigate the orbits of substructure haloes likely, according to a semi-analytic galaxy form…
Counterrotating Stars in Simulated Galaxy Disks
David G. Algorry, Julio F. Navarro, Mario G. Abadi +3
Counterrotating stars in disk galaxies are a puzzling dynamical feature whose origin has been ascribed to either satellite accretion events or to disk instabilities triggered by de…
In the thick of it: metal-poor disc stars in RAVE
G. Kordopatis, G. Gilmore, R. F. G. Wyse +17
By selecting in the RAVE-DR4 survey the stars located between 1 and 2 kpc above the Galactic plane, we question the consistency of the simplest three-component model (thin disc, th…
A new stellar chemo-kinematic relation reveals the merger history of the Milky Way disc
I. Minchev, C. Chiappini, M. Martig +27
The velocity dispersions of stars near the Sun are known to increase with stellar age, but age can be difficult to determine so a proxy like the abundance of alpha elements (e.g.,…
A RAVE Investigation on Galactic open Clusters I. Radial velocities and metallicities
C. Conrad, R. -D. Scholz, N. V. Kharchenko +25
Context. Galactic open clusters (OCs) mainly belong to the young stellar population in the Milky Way disk, but are there groups and complexes of OCs that possibly define an additio…
The RAdial Velocity Experiment (RAVE): Fourth data release
G. Kordopatis, G. Gilmore, M. Steinmetz +48
We present the stellar atmospheric parameters (effective temperature, surface gravity, overall metallicity), radial velocities, individual abundances and distances determined for 4…
Chemical gradients in the Milky Way from the RAVE data. I. Dwarf stars
C. Boeche, A. Siebert, T. Piffl +20
Aim: We aim at measuring the chemical gradients of the elements Mg, Al, Si, and Fe along the Galactic radius to provide new constraints on the chemical evolution models of the Gala…
Chromospherically Active Stars in the RAVE Survey. I. The Catalogue
M. Žerjal, T. Zwitter, G. Matijevič +15
RAVE, the unbiased magnitude limited survey of the southern sky stars, contained 456,676 medium-resolution spectra at the time of our analysis. Spectra cover the CaII IRT range whi…
Diffuse interstellar band at 8620 Å in RAVE: A new method for detecting the diffuse interstellar band in spectra of cool stars
J. Kos, T. Zwitter, E. K. Grebel +16
Diffuse interstellar bands are usually observed in spectra of hot stars, where interstellar lines are rarely blended with stellar ones. The need for hot stars is a strong limitatio…
The RAVE survey: the Galactic escape speed and the mass of the Milky Way
T. Piffl, C. Scannapieco, J. Binney +22
We construct new estimates on the Galactic escape speed at various Galactocentric radii using the latest data release of the Radial Velocity Experiment (RAVE DR4). Compared to prev…
Galactic kinematics and dynamics from RAVE stars
James Binney, Ben Burnett, Georges Kordopatis +15
We analyse the kinematics of ~400000 RAVE stars. We split the sample into hot and cold dwarfs, red-clump and non-clump giants. The kinematics of the clump giants are consistent wit…
Constraints on the Galactic Bar from the Hercules stream as traced with RAVE across the Galaxy
T. Antoja, A. Helmi, W. Dehnen +20
Non-axisymmetries in the Galactic potential (spiral arms and bar) induce kinematic groups such as the Hercules stream. Assuming that Hercules is caused by the effects of the Outer…
New distances to RAVE stars
James Binney, Ben Burnett, Georges Kordopatis +16
Probability density functions are determined from new stellar parameters for the distance moduli of stars for which the RAdial Velocity Experiment (RAVE) has obtained spectra with…
The asymmetric drift, the local standard of rest, and implications from RAVE data
O. Golubov, A. Just, O. Bienaymé +13
The determination of the LSR is still a matter of debate. The classical value of the tangential peculiar motion of the Sun with respect to the LSR was challenged in recent years, c…
Streams in the Aquarius stellar haloes
Facundo A. Gómez, Amina Helmi, Andrew P. Cooper +3
We use the very high resolution, fully cosmological simulations from the Aquarius project, coupled to a semi-analytical model of galaxy formation, to study the phase-space distribu…
The relation between chemical abundances and kinematics of the Galactic disc with RAVE
C. Boeche, C. Chiappini, I. Minchev +20
Aims: We study the relations between stellar kinematics and chemical abundances of a large sample of RAVE giants in search for selection criteria needed for disentangling different…
The Mass Profile and Accretion History of Cold Dark Matter Halos
Aaron D. Ludlow, Julio F. Navarro, Michael Boylan-Kolchin +6
We use the Millennium Simulation series to study the relation between the accretion history (MAH) and mass profile of cold dark matter halos. We find that the mean density within t…
A Vast Thin Plane of Co-rotating Dwarf Galaxies Orbiting the Andromeda Galaxy
Rodrigo A. Ibata, Geraint F. Lewis, Anthony R. Conn +13
Dwarf satellite galaxies are thought to be the remnants of the population of primordial structures that coalesced to form giant galaxies like the Milky Way. An early analysis noted…