Results 11 to 20 of about 307,016 (327)

Bar Formation in Milky Way type Galaxies

open access: yesOpen Astronomy, 2016
Many barred galaxies, possibly including the Milky Way, have cusps in their centers. There is a widespread belief, however, that the usual bar instability, which occurs in bulgeless galaxy models, is impossible for cuspy models because of the presence of
Polyachenko E. V., Berczik P., Just A.
doaj   +3 more sources

Gas and Star Formation in Satellites of Milky Way Analogs

open access: yesThe Astrophysical Journal
We have imaged the entirety of eight (plus one partial) Milky Way (MW)–like satellite systems, a total of 42 (45) satellites, from the Satellites Around Galactic Analogs II catalog in both H α and H i with the Canada–France–Hawaii Telescope and the ...
Michael G. Jones   +11 more
doaj   +5 more sources

Kinematic-chemical Analysis and Time Tagging for the Diagonal Ridge Structure of the Galactic Outer Disk with LAMOST Red-giant Branch Stars

open access: yesThe Astronomical Journal, 2023
We investigate the kinematic-chemical distribution of red-giant branch stars from the LAMOST survey crossed matched with Gaia DR2 proper motions, and present time tagging for the well-known ridge structures (diagonal distributions for V _R in the R , V ...
Peng Yang   +4 more
doaj   +1 more source

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

open access: yesThe 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

Radial structure and formation of the Milky Way disc [PDF]

open access: yesAstronomy & Astrophysics, 2021
Context. The formation of the Galactic disc is an enthusiastically debated issue. Numerous studies and models seek to identify the dominant physical process(es) that shaped its observed properties; for example, satellite accretion, starburst, quenching, gas infall, and stellar radial migration. Aims.
Katz, D.   +4 more
openaire   +5 more sources

Chemodynamical Analysis of Metal-rich High-eccentricity Stars in the Milky Way's Disk

open access: yesThe Astrophysical Journal, 2023
We present a chemodynamical analysis of 11,562 metal-rich, high-eccentricity halo-like main-sequence stars, which have been referred to as the Splash or Splashed Disk, selected from the Sloan Digital Sky Survey and Large Sky Area Multi-Object Fiber ...
Ayeon Lee   +4 more
doaj   +1 more source

A Blueprint for the Milky Way’s Stellar Populations. IV. A String of Pearls—the Galactic Starburst Sequence

open access: yesThe 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

Abundance Gradients and the Formation of the Milky Way [PDF]

open access: yesThe Astrophysical Journal, 2001
In this paper we adopt a chemical evolution model, which is an improved version of the Chiappini, Matteucci and Gratton (1997) model, assuming two main accretion episodes for the formation of the Galaxy. The present model takes into account in more detail than previously the halo density distribution and explores the effects of a threshold density in ...
Cristina Chiappini   +3 more
openaire   +5 more sources

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

open access: yesThe 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   +9 more
doaj   +1 more source

Star formation law in the Milky Way [PDF]

open access: yesPublications of the Astronomical Society of Japan, 2017
Abstract The Schmidt law (SF law) in the Milky Way was investigated using 3D distribution maps of H ii regions and H i and molecular (H2) gases with spatial resolutions of ∼1 kpc in the Galactic plane and a few tens of pc in the vertical direction. H ii regions were shown to be distributed in a star-forming (SF) disk with nearly constant
Hiroyuki Nakanishi, Yoshiaki Sofue
openaire   +4 more sources

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