Results 31 to 40 of about 30,917 (286)

Chemically characterising the Milky Way’s stellar halo

Proceedings of the International Astronomical Union, 2022
AbstractGalactic haloes in a Λ-CDM universe are predicted to host today a swarm of debris resulting from cannibalised dwarf galaxies. The chemo-dynamical information recorded in their stellar populations helps elucidate their nature, constraining the assembly history of the Galaxy.
Danny Horta, Ricardo P. Schiavon
openaire   +1 more source

The galactic population of white dwarfs [PDF]

, 2009
Original paper can be found at: http://www.iop.org/EJ/conf DOI: 10.1088/1742-6596/172/1/012004 [16th European White Dwarfs Workshop]The contribution of white dwarfs of the different Galactic populations to the stellar content of our Galaxy is only poorly
Alcock C Allsman R A Alves D R, Blöcker T, Chabrier G Baraffe I Allard F, Hansen B M S, Holberg J B Oswalt T D, Holberg J B Sion E M Oswalt T McCook G P Foran S, Napiwotzki R Christlieb N Drechsel H, Ralf Napiwotzki, Reid I N Sahu K C, Voss B, Weidemann V   +10 more
core   +2 more sources

Rotational signature of the Milky Way stellar halo [PDF]

Monthly Notices of the Royal Astronomical Society, 2013
We measure the rotation of the Milky Way stellar halo on two samples of Blue Horizontal Branch (BHB) field halo stars from the Sloan Digital Sky Survey (SDSS) with four different methods. The two samples comprise 1582 and 2563 stars respectively and reach out to ~50 kpc in galactocentric distance. Two of the methods to measure rotation rely exclusively
Fermani, Francesco, Schönrich, Ralph
openaire   +2 more sources

The velocity dispersion and mass profile of the Milky Way [PDF]

, 2006
We re-analyse the velocity-dispersion profile sigma(r) at radii r>10 kpc in the Galactic stellar halo, recently derived by Battaglia et al. (2005), who concluded that, for constant velocity anisotropy of the tracers, these data rule out a flat circular ...
Battaglia, Bullock, Chiba, Côté, Côté, Dean E. McLaughlin, Dehnen, Dehnen, Dekel, Gould, Harris, Harris, Jalpesh Sachania, Kochanek, Mamon, Morrison, Méndez, Navarro, Navarro, Richtler, Rohlfs, Romanowsky, Walter Dehnen, Yanny   +23 more
core   +2 more sources

Formation ofin situstellar haloes in Milky Way-mass galaxies [PDF]

Monthly Notices of the Royal Astronomical Society, 2015
We study the formation of stellar haloes in three Milky Way-mass galaxies using cosmological smoothed particle hydrodynamics simulations, focusing on the subset of halo stars that form in situ, as opposed to those accreted from satellites. In situ stars in our simulations dominate the stellar halo out to 20 kpc and account for 30-40 per cent of its ...
Cooper, Andrew P., Parry, Owen H., Lowing, Ben, Cole, Shaun, Frenk, Carlos   +4 more
openaire   +3 more sources

Reliability of the Measured Velocity Anisotropy of the Milky Way Stellar Halo [PDF]

The Astrophysical Journal, 2017
Abstract Determining the velocity distribution of halo stars is essential for estimating the mass of the Milky Way and for inferring its formation history. Since the stellar halo is a dynamically hot system, the velocity distribution of halo stars is well described by the three-dimensional velocity dispersions
Kohei Hattori, Monica Valluri, Sarah R. Loebman, Eric F. Bell   +3 more
openaire   +2 more sources

Stellar Over-Densities in the Outer Halo of the Milky Way [PDF]

Publications of the Astronomical Society of Australia, 2010
AbstractThis study presents a tomographic survey of a subset of the outer halo (10–40 kpc) drawn from the Sloan Digital Sky Survey Data Release 6. Halo substructure on spatial scales of >3 degrees is revealed as an excess in the local density of sub-giant stars.
openaire   +3 more sources

The stellar halo in the inner Milky Way: predicted shape and kinematics [PDF]

Monthly Notices of the Royal Astronomical Society: Letters, 2016
Abstract We have used N-body simulations for the Milky Way to investigate the kinematic and structural properties of the old metal-poor stellar halo in the barred inner region of the Galaxy. We find that the extrapolation of the density distribution for bulge RR Lyrae stars, ρ ∼ r−3, approximately matches the number density of RR Lyrae ...
Pérez-Villegas, A., Portail, M., Gerhard, O.   +2 more
openaire   +3 more sources

The Stellar Halo of the Galaxy is Tilted and Doubly Broken

The Astronomical Journal, 2022
Modern Galactic surveys have revealed an ancient merger that dominates the stellar halo of our galaxy (Gaia–Sausage–Enceladus, GSE). Using chemical abundances and kinematics from the H3 Survey, we identify 5559 halo stars from this merger in the radial ...
Jiwon Jesse Han, Charlie Conroy, Benjamin D. Johnson, Joshua S. Speagle, Ana Bonaca, Vedant Chandra, Rohan P. Naidu, Yuan-Sen Ting, Rebecca Woody, Dennis Zaritsky   +9 more
doaj   +1 more source

STELLAR VELOCITY DISPERSION AND ANISOTROPY OF THE MILKY WAY INNER HALO [PDF]

The Astrophysical Journal, 2015
We measure the three components of velocity dispersion, $σ_{R},σ_θ,σ_ϕ$, for stars within 6 < R < 30 kpc of the Milky Way using a new radial velocity sample from the MMT telescope. We combine our measurements with previously published data so that we can more finely sample the stellar halo.
Charles King III, Warren R. Brown, Margaret J. Geller, Scott J. Kenyon   +3 more
openaire   +2 more sources