Results 21 to 30 of about 9,204,018 (295)
The Rapid Onset of Stellar Bars in the Baryon-dominated Centers of Disk Galaxies
The Astrophysical Journal, 2023 Recent observations of high-redshift galactic disks ( z ≈ 1–3) show a strong negative trend in the dark-matter (DM) fraction f _DM with increasing baryon surface density.
Joss Bland-Hawthorn +3 more
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The formation and early evolution of the Milky Way [PDF]
Symposium - International Astronomical Union, 1985 In broad outline, the traditional picture for the formation of the Milky Way can be summarized as follows. The proto-galaxy consisted of a slowly rotating cloud of metal-free gas that cooled by bremsstrahlung and recombination radiation. As the internal pressure of the gas decreased, it collapsed in stages with smaller dimensions, faster rotation ...
openaire +1 more source
The Imprint of Clump Formation at High Redshift. II. The Chemistry of the Bulge
The Astrophysical Journal, 2023 In Paper I, we showed that clumps in high-redshift galaxies, having a high star formation rate density (Σ _SFR ), produce disks with two tracks in the [Fe/H]–[ α /Fe] chemical space, similar to that of the Milky Way’s (MW’s) thin+thick disks.
Victor P. Debattista +13 more
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Mapping the Milky Way at 21 cm Wave Length with SALSA Radio Telescope
, 2018 <p>Milky-Way-Mapping</p> <p>Mapping of the Milky Way is a galactic mapping at 21 cm Hydrogen spectrum to determine the Spiral Structure of Milky Way Galaxy in different Galactic planes from Galactic Longitude 6-225 Degree and Latitude ...
Mir Sakhawat Hossain
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The Astrophysical Journal, 2023 Orbital characteristics based on Gaia Early Data Release 3 astrometric parameters are analyzed for ∼1700 r -process-enhanced (RPE; [Eu/Fe] > +0.3) metal-poor stars ([Fe/H] ≤ −0.8) compiled from the R -Process Alliance, the GALactic Archaeology with ...
Derek Shank +10 more
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Formation and Evolution of the Milky Way [PDF]
Symposium - International Astronomical Union, 1997 To paint with broad brush strokes, the spectrum of Galactic formation models has as extrema what may be termed the “fast and smooth” and the “slow and lumpy” scenarios. Appropriate or not, to ascribe as champions of these views the works of, respectively, Eggen et al.
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Distant Echoes of the Milky Way’s Last Major Merger
The Astrophysical Journal, 2023 The majority of the Milky Way’s stellar halo consists of debris from our galaxy’s last major merger, the Gaia-Sausage-Enceladus (GSE). In the past few years, stars from the GSE have been kinematically and chemically studied in the inner 30 kpc of our ...
Vedant Chandra +11 more
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A Model for the Formation of the Milky Way [PDF]
Publications of the Astronomical Society of Australia, 2004 AbstractA new chemodynamical model for the formation and evolution of a Milky Way type galaxy is introduced. In this scenario, the galaxy forms inside a slowly growing dark matter halo in a ΛCDM cosmology. In contrast to the simple merger and collapse scenarios, the galactic mass grows continuously over a Hubble time.
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, 1997 We review observational evidence bearing on the formation of a prototypical large spiral galaxy, the Milky Way. New ground- and space-based studies of globular star clusters and dwarf spheroidal galaxies provide a wealth of information to constrain theories of galaxy formation.
Hesser, J. E. +11 more
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Observational Constraints on Milky Way Halo Formation
, 2020 The formation of the Milky Way stellar halo is explored through the application of large-scale astronomical sky surveys. Multiple techniques are developed to identify and characterize metal-poor stars. Implications of the chemical abundance, spatial, and
Devin Whitten (17547927)
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