Results 21 to 30 of about 29,619 (304)
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
Eric F. Bell +5 more
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Discovery of a New Stellar Subpopulation Residing in the (Inner) Stellar Halo of the Milky Way [PDF]
The Astrophysical Journal Letters, 2019 Abstract We report the discovery of a unique collection of metal-poor giant stars that exhibit anomalously high levels of 28Si, clearly above typical Galactic levels. Our sample spans a narrow range of metallicities, peaking at −1.07 ± 0.06, and exhibits abundance ratios of [Si, Al/Fe] that are as extreme as those observed in Galactic ...
José G. Fernández-Trincado +10 more
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The kinematic properties of Milky Way stellar halo populations [PDF]
Monthly Notices of the Royal Astronomical Society, 2021 ABSTRACT In the Gaia era, stellar kinematics are extensively used to study Galactic halo stellar populations, to search for halo structures, and to characterize the interface between the halo and hot disc populations. We use distribution function-based models of modern data sets with 6D phase space data to qualitatively describe a ...
James M M Lane, Jo Bovy, J Ted Mackereth
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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
BROKEN AND UNBROKEN: THE MILKY WAY AND M31 STELLAR HALOS [PDF]
The Astrophysical Journal, 2013 We use the Bullock & Johnston suite of simulations to study the density profiles of L*-type galaxy stellar haloes. Observations of the Milky Way and M31 stellar haloes show contrasting results: the Milky Way has a `broken' profile, where the density falls off more rapidly beyond ~ 25 kpc, while M31 has a smooth profile out to 100 kpc with no ...
Alis J. Deason +3 more
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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
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The Astrophysical Journal, 2023 We study satellite counts and quenched fractions for satellites of Milky Way analogs in Romulus25 , a large-volume cosmological hydrodynamic simulation.
Jordan Van Nest +5 more
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The Astrophysical Journal, 2023 We continue our series of papers on phase-space distributions of stars in the Milky Way based on photometrically derived metallicities and Gaia astrometry, with a focus on the halo−disk interface in the local volume.
Deokkeun An +3 more
doaj +1 more source
Rotational signature of the Milky Way stellar halo [PDF]
Monthly Notices of the Royal Astronomical Society, 2013 accepted for publication in MNRAS 20 pages, 14 ...
Ralph Schönrich, Francesco Fermani
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The progenitor galaxies of stellar haloes as ‘failed’ Milky Ways
Monthly Notices of the Royal Astronomical Society, 2023 ABSTRACT The stellar halo of the Milky Way records the history of its interactions with dwarf galaxies, whose subsequent destruction results in the formation of an extended stellar component. Recent works have suggested that galaxies with masses comparable to the Large Magellanic Cloud (LMC, $M_\star \sim 10^9$ M☉) may be the primary ...
Sownak Bose, Alis J Deason
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