Results 21 to 30 of about 30,917 (286)

QUANTIFYING KINEMATIC SUBSTRUCTURE IN THE MILKY WAY'S STELLAR HALO [PDF]

The Astrophysical Journal, 2011
We present and analyze the positions, distances, and radial velocities for over 4000 blue horizontal-branch (BHB) stars in the Milky Way's halo, drawn from SDSS DR8. We search for position-velocity substructure in these data, a signature of the hierarchical assembly of the stellar halo.
Xue, Xiang-Xiang, Rix, Hans-Walter, Yanny, Brian, Beers, Timothy C, Bell, Eric F, Zhao, Gang, Bullock, James S, Johnston, Kathryn V, Morrison, Heather, Rockosi, Constance, Koposov, Sergey E, Kang, Xi, Liu, Chao, Luo, Ali, Lee, Young Sun, Weaver, Benjamin A   +15 more
openaire   +5 more sources

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
openaire   +3 more sources

The Galaxy and its stellar halo: insights on their formation from a hybrid cosmological approach [PDF]

, 2008
We use a series of high-resolution simulations of a `Milky-Way' halo coupled to semi-analytic methods to study the formation of our own Galaxy and of its stellar halo.
De Lucia, Gabriella, Helmi, Amina
core   +3 more sources

Decoding Galactic Merger Histories

Galaxies, 2017
Galaxy mergers are expected to influence galaxy properties, yet measurements of individual merger histories are lacking. Models predict that merger histories can be measured using stellar halos and that these halos can be quantified using observations of
Eric F. Bell, Antonela Monachesi, Richard D’Souza, Benjamin Harmsen, Roelof S. de Jong, David Radburn-Smith, Jeremy Bailin, Benne W. Holwerda   +7 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 ...
Deason, A. J., Belokurov, V., Evans, N. W., Johnston, K. V.   +3 more
openaire   +2 more sources

The artemis simulations: stellar haloes of Milky Way-mass galaxies [PDF]

Monthly Notices of the Royal Astronomical Society, 2020
ABSTRACT We introduce the Assembly of high-ResoluTion Eagle-simulations of MIlky Way-type galaxieS (artemis) simulations, a new set of 42 zoomed-in, high-resolution (baryon particle mass of $\approx 2\times 10^4 \, {\rm M}_{\odot }\, h^{-1}$), hydrodynamical simulations of galaxies residing in haloes of Milky Way mass, simulated with the
Andreea S Font, Ian G McCarthy, Robert Poole-Mckenzie, Sam G Stafford, Shaun T Brown, Joop Schaye, Robert A Crain, Tom Theuns, Matthieu Schaller   +8 more
openaire   +4 more sources

The Observable Properties of Galaxy Accretion Events in Milky Way–like Galaxies in the FIRE-2 Cosmological Simulations

The Astrophysical Journal, 2023
In the Λ-Cold Dark Matter model of the universe, galaxies form in part through accreting satellite systems. Previous works have built an understanding of the signatures of these processes contained within galactic stellar halos.
Danny Horta, Emily C. Cunningham, Robyn E. Sanderson, Kathryn V. Johnston, Nondh Panithanpaisal, Arpit Arora, Lina Necib, Andrew Wetzel, Jeremy Bailin, Claude-André Faucher-Giguère   +9 more
doaj   +1 more source

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
openaire   +2 more sources

The Metal-weak Milky Way Stellar Disk Hidden in the Gaia–Sausage–Enceladus Debris: The APOGEE DR17 View

The Astrophysical Journal, 2023
We have for the first time identified the early stellar disk in the Milky Way by using a combination of elemental abundances and kinematics. Using data from APOGEE DR17 and Gaia we select stars in the Mg–Mn–Al–Fe plane with elemental abundances ...
Sofia Feltzing, Diane Feuillet
doaj   +1 more source

The dual nature of the Milky Way stellar halo [PDF]

Proceedings of the International Astronomical Union, 2010
AbstractThe theory of the Milky Way formation, in the framework of the ΛCDM model, predicts galactic stellar halos to be built from multiple accretion events starting from the first structure to collapse in the Universe.Evidences in the past few decades have indicated that the Galactic halo consists of two overlapping structural components, an inner ...
Curir, Anna, Murante, Giuseppe, Poglio, Eva, Villalobos, Álvaro   +3 more
openaire   +1 more source