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The Rich Are Different: Evidence from the RAVE Survey for Stellar Radial Migration
G. Kordopatis, J. Binney, G. Gilmore +21
Using the RAdial Velocity Experiment fourth data release (RAVE DR4), and a new metallicity calibration that will be also taken into account in the future RAVE DR5, we investigate t…
Local Group galaxies emerge from the dark
Till Sawala, Carlos S. Frenk, Azadeh Fattahi +13
The "Lambda Cold Dark Matter" (LCDM) model of cosmic structure formation is eminently falsifiable: once its parameters are fixed on large scales, it becomes testable in the nearby…
Characterizing the High-Velocity Stars of RAVE: The Discovery of a Metal-Rich Halo Star Born in the Galactic Disk
K. Hawkins, G. Kordopatis, G. Gilmore +21
We aim to characterize high-velocity (HiVel) stars in the solar vicinity both chemically and kinematically using the fourth data release of the RAdial Velocity Experiment (RAVE). W…
Galactic Tides and the Shape and Orientation of Dwarf Galaxy Satellites
Christopher Barber, Else Starkenburg, Julio F. Navarro +1
We use cosmological N-body simulations from the Aquarius Project to study the tidal effects of a dark matter halo on the shape and orientation of its substructure. Although tides a…
A PAndAS view of M31 dwarf elliptical satellites: NGC147 and NGC185
D. Crnojević, A. M. N. Ferguson, M. J. Irwin +9
We exploit data from the Pan-Andromeda Archaeological Survey (PAndAS) to study the extended structures of M31's dwarf elliptical companions, NGC147 and NGC185. Our wide-field, homo…
Spectroscopic Signatures of Extra-Tidal Stars Around the Globular Clusters NGC 6656 (M22), NGC 3201 and NGC 1851 from RAVE
Andrea Kunder, G. Bono, T. Piffl +22
Stellar population studies of globular clusters have suggested that the brightest clusters in the Galaxy might actually be the remnant nuclei of dwarf spheroidal galaxies. If the p…
APASS Landolt-Sloan BVgri photometry of RAVE stars. I. Data, effective temperatures and reddenings
U. Munari, A. Henden, A. Frigo +24
We provide APASS photometry in the Landolt BV and Sloan g'r'i' bands for all the 425,743 stars included in the latest 4th RAVE Data Release. The internal accuracy of the APASS phot…
Pseudo Three-dimensional Maps of the Diffuse Interstellar Band at 862 nm
Janez Kos, Tomaž Zwitter, Rosemary Wyse +20
The diffuse interstellar bands (DIBs) are absorption lines observed in visual and near infrared spectra of stars. Understanding their origin in the interstellar medium (ISM) is one…
Elemental Abundances in Milky Way-like Galaxies from a Hierarchical Galaxy Formation Model
Gabriella De Lucia, Luca Tornatore, Carlos S. Frenk +3
We develop a new method to account for the finite lifetimes of stars and trace individual abundances within a semi-analytic model of galaxy formation. At variance with previous met…
The EAGLE project: Simulating the evolution and assembly of galaxies and their environments
Joop Schaye, Robert A. Crain, Richard G. Bower +19
We introduce the Virgo Consortium's EAGLE project, a suite of hydrodynamical simulations that follow the formation of galaxies and black holes in representative volumes. We discuss…
Chemical gradients in the Milky Way from the RAVE data. II. Giant stars
C. Boeche, A. Siebert, T. Piffl +19
We provide new constraints on the chemo-dynamical models of the Milky Way by measuring the radial and vertical chemical gradients for the elements Mg, Al, Si, Ti, and Fe in the Gal…
The chosen few: the low mass halos that host faint galaxies
Till Sawala, Carlos S. Frenk, Azadeh Fattahi +8
Since reionization prevents star formation in most halos below 3 x 10^9 solar masses, dwarf galaxies only populate a fraction of existing dark matter halos. We use hydrodynamic cos…
Weighing the local dark matter with RAVE red clump stars
O. Bienaymé, B. Famaey, A. Siebert +16
We determine the Galactic potential in the solar neigbourhood from RAVE observations. We select red clump stars for which accurate distances, radial velocities, and metallicities h…
Constraining the Galaxy's dark halo with RAVE stars
T. Piffl, J. Binney, P. J. McMillan +17
We use the kinematics of giant stars that lie within kpc of the plane to measure the vertical profile of mass density near the Sun. We find that the dark…
Kinematic modelling of the Milky Way using the RAVE and GCS stellar surveys
S. Sharma, J. Bland-Hawthorn, J. Binney +19
We investigate the kinematic parameters of the Milky Way disc using the RAVE and GCS stellar surveys. We do this by fitting a kinematic model to the data taking the selection funct…
Comparing M31 and Milky Way Satellites: The Extended Star Formation Histories of Andromeda II and Andromeda XVI
Daniel R. Weisz, Evan D. Skillman, Sebastian L. Hidalgo +16
We present the first comparison between the lifetime star formation histories (SFHs) of M31 and Milky Way (MW) satellites. Using the Advanced Camera for Surveys aboard the Hubble S…
The effect of radial migration on galactic disks
Carlos Vera-Ciro, Elena D'Onghia, Julio Navarro +1
We study the radial migration of stars driven by recurring multi-arm spiral features in an exponential disk embedded in a dark matter halo. The spiral perturbations redistribute an…
Bent by baryons: the low mass galaxy-halo relation
Till Sawala, Carlos S. Frenk, Azadeh Fattahi +11
The relation between galaxies and dark matter halos is of vital importance for evaluating theoretical predictions of structure formation and galaxy formation physics. We show that…
The PAndAS Field of Streams: stellar structures in the Milky Way halo toward Andromeda and Triangulum
Nicolas F. Martin, Rodrigo A. Ibata, R. Michael Rich +16
We reveal the highly structured nature of the Milky Way stellar halo within the footprint of the PAndAS photometric survey from blue main sequence and main sequence turn-off stars.…
The ACS LCID project. X. The Star Formation History of IC 1613: Revisiting the Over-Cooling Problem
Evan D. Skillman, Sebastian L. Hidalgo, Daniel R. Weisz +13
We present an analysis of the star formation history (SFH) of a field near the half light radius in the Local Group dwarf irregular galaxy IC 1613 based on deep Hubble Space Telesc…
The shape of dark matter subhalos in the Aquarius simulations
Carlos Vera-Ciro, Laura V. Sales, Amina Helmi +1
We analyze the Aquarius simulations to characterize the shape of dark matter halos with peak circular velocity in the range 8<Vmax<200 km/s, and perform a convergence study using t…