Results 31 to 40 of about 589 (260)
The Nature of the Milky Way’s Stellar Halo Revealed by the Three Integrals of Motion [PDF]
The Astrophysical Journal, 2021 Abstract We developed a new selection method of halo stars in the phase-space distribution defined by the three integrals of motion in an axisymmetric Galactic potential (E, L z , I 3), where I 3 is the third integral of motion.
Daniela Carollo, Masashi Chiba
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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. +4 more
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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. +2 more
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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.
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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 +3 more
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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 +9 more
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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 +3 more
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Stellar haloes in Milky Way mass galaxies: from the inner to the outer haloes [PDF]
Monthly Notices of the Royal Astronomical Society, 2014 We present a comprehensive study of the chemical properties of the stellar haloes of Milky-Way mass galaxies, analysing the transition between the inner to the outer haloes. We find the transition radius between the relative dominance of the inner-halo and outer-halo stellar populations to be ~15-20 kpc for most of our haloes, similar to that inferred ...
P. B. Tissera +3 more
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Are dSph galaxies Galactic building blocks?
EPJ Web of Conferences, 2012 Dwarf spheroidal galaxies (dSph) are frequently assumed to represent surviving examples of a vast now destroyed population of small systems in which many of the stars now forming the Milky Way were formed. Ongoing accretion and considerable sub-structure
Gilmore G., Asiri H.M.
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The Milky Way's stellar halo - lumpy or triaxial?
Journal of Physics: Conference Series, 2006 10 pages, 10 figs, to appear in proceedings of conference "Physics at the end of the Galactic Cosmic Ray Spectrum", Journal of Physics: Conf. series, eds. G.
Newberg, Heidi Jo, Yanny, Brian
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