Results 21 to 30 of about 13,860 (288)
Progenitor Diversity in the Accreted Stellar Halos of Milky Way–like Galaxies
The Astrophysical JournalOngoing large stellar spectroscopic surveys of the Milky Way seek to reconstruct the major events in the assembly history of the Galaxy. Chemical and kinematic observations can be used to separate the contributions of different progenitor galaxies to the
Sy-Yun Pu +4 more
doaj +3 more sources
Dynamics of stellar and HI streams in the Milky Way halo [PDF]
EPJ Web of Conferences, 2012 Stellar streams are key players in many aspects of Milky Way studies and, in particular, studying their orbital dynamics is crucial for furthering our understanding of the Milky Wayʼs gravitational potential.
Jin S.
doaj +3 more sources
ON THE SHOULDERS OF GIANTS: PROPERTIES OF THE STELLAR HALO AND THE MILKY WAY MASS DISTRIBUTION [PDF]
The Astrophysical Journal, 2014 Halo stars orbit within the potential of the Milky Way and hence their kinematics can be used to understand the underlying mass distribution. However, the inferred mass distribution depends sensitively upon assumptions made on the density and the velocity anisotropy profiles of the tracers. Also, there is a degeneracy between the parameters of the halo
Prajwal Raj Kafle +3 more
openaire +4 more sources
Constructing the Milky Way Stellar Halo in the Galactic Center by Direct Orbit Integration [PDF]
Astronomical Journal, 2022 The halo stars on highly-radial orbits should inevitably pass the center regions of the Milky Way. Under the assumption that the stellar halo is in “dynamical equilibrium” and is axisymmetric, we integrate the orbits of ∼10,000 halo K giants at 5 ≤ r ...
Chengqun Yang +4 more
semanticscholar +1 more source
An Old, Metal-rich Accreted Stellar Component in the Milky Way Stellar Disk [PDF]
Astrophysical Journal, 2022 We study the possibility that the Milky Ways’ cool stellar disk includes mergers with ancient stars. Galaxies are understood to form in a hierarchical manner, where smaller (proto-)galaxies merge into larger ones.
D. Feuillet +3 more
semanticscholar +1 more source
STELLAR POPULATION VARIATIONS IN THE MILKY WAY's STELLAR HALO [PDF]
The Astronomical Journal, 2010 If the stellar halos of disk galaxies are built up from the disruption of dwarf galaxies, models predict highly structured variations in the stellar populations within these halos. We test this prediction by studying the ratio of blue horizontal branch stars (BHB stars; more abundant in old, metal-poor populations) to main-sequence turn-off stars (MSTO
Bell, Eric F. +4 more
openaire +2 more sources
A Dwarf Galaxy Debris Stream Associated with Palomar 1 and the Anticenter Stream
The Astrophysical Journal Letters, 2023 We report the discovery of a new stream (dubbed as Yangtze) detected in Gaia Data Release 3. The stream is at a heliocentric distance of ∼9.12 kpc and spans nearly 27° by 1.°9 on the sky.
Yong Yang +4 more
doaj +1 more source
Building Blocks of the Milky Way's Stellar Halo [PDF]
Proceedings of the International Astronomical Union, 2015 AbstractWe study the assembly history of the stellar halo of Milky Way-like galaxies using the six high-resolution Aquarius dark matter simulations combined with the Munich-Groningen semi-analytic galaxy formation model. Our goal is to understand the stellar population contents of the building blocks of the Milky Way halo, including their star ...
Oirschot, P. van +7 more
openaire +3 more sources
HALO7D. III. Chemical Abundances of Milky Way Halo Stars from Medium-resolution Spectra
The Astrophysical Journal, 2023 The Halo Assembly in Lambda Cold Dark Matter: Observations in 7 Dimensions (HALO7D) survey measures the kinematics and chemical properties of stars in the Milky Way (MW) stellar halo to learn about the formation of our Galaxy.
Kevin A. McKinnon +6 more
doaj +1 more source
Reading the CARDs: The Imprint of Accretion History in the Chemical Abundances of the Milky Way's Stellar Halo [PDF]
Astrophysical Journal, 2021 In the era of large-scale spectroscopic surveys in the Local Group, we can explore using chemical abundances of halo stars to study the star formation and chemical enrichment histories of the dwarf galaxy progenitors of the Milky Way (MW) and M31 stellar
E. Cunningham +9 more
semanticscholar +1 more source