Results 31 to 40 of about 320,090 (320)
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
doaj +1 more source
On the chemical evolution of the Milky Way [PDF]
Proceedings of the International Astronomical Union, 2008 AbstractI discuss three different topics concerning the chemical evolution of the Milky Way (MW). 1) The metallicity distribution of the MW halo; it is shown that this distribution can be analytically derived in the framework of the hierarchical merging scenario for galaxy formation, assuming that the component sub-haloes had chemical properties ...
openaire +3 more sources
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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The Unusual Milky Way-Local Sheet System: Implications for Spin Strength and Alignment [PDF]
, 2022 The Milky Way and the Local Sheet form a peculiar galaxy system in terms of the unusually low velocity dispersion in our neighbourhood and the seemingly high mass of the Milky Way for such an environment. Using the TNG300 simulation we searched for Milky Way analogues (MWA) located in cosmological walls with velocity dispersion in their local Hubble ...
arxiv +1 more source
The chemical evolution of barium and europium in the Milky Way [PDF]
Astronomy & Astrophysics, 2006 We compute the evolution of the abundances of barium and europium in the Milky Way and we compare our results with the observed abundances from the recent UVES Large Program "First Stars". We use a chemical evolution model which already reproduces the majority of observational constraints.
CESCUTTI G +4 more
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The Formalism of Milky-Way Antimatter-Domains Evolution
Galaxies, 2023 If baryosynthesis is strongly nonhomogeneous, macroscopic regions with antibaryon excess can be created in the same process from which the baryonic matter is originated. This exotic possibility can become real, if the hints to the existence of antihelium
Maxim Yu. Khlopov, Orchidea Maria Lecian
doaj +1 more source
Stellar elemental abundances constraining nucleosynthesis and chemical evolution of the universe [PDF]
EPJ Web of Conferences, 2022 Measurements of elemental abundances of stars in the Milky Way and surrounding dwarf galaxies in the past few decades have been providing useful constraints on modeling the nucleosynthesis and chemical evolution.
Aoki Wako
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Stellar Bars in Isolated Gas-rich Spiral Galaxies Do Not Slow Down
The Astrophysical Journal, 2023 Elongated bar-like features are ubiquitous in galaxies, occurring at the centers of approximately two-thirds of spiral disks in the nearby Universe. Due to gravitational interactions between the bar and the other components of galaxies, it is expected ...
Angus Beane +8 more
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Chemical evolution of the Milky Way: the origin of phosphorus [PDF]
Astronomy & Astrophysics, 2012 Context. Recently, for the first time the abundance of P has been measured in disk stars. This provides the opportunity of comparing the observed abundances with predictions from theoretical models. Aims. We aim at predicting the chemical evolution of P in the Milky Way and compare our results with the observed P abundances in disk stars in order to ...
P. Francois +6 more
openaire +7 more sources
Disentangling Stellar Age Estimates from Galactic Chemodynamical Evolution
The Astrophysical Journal, 2023 Stellar ages are key for determining the formation history of the Milky Way, but are difficult to measure precisely. Furthermore, methods that use chemical abundances to infer ages may entangle the intrinsic evolution of stars with the chemodynamical ...
Jeff Shen +4 more
doaj +1 more source