Results 31 to 40 of about 7,795,018 (296)
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
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 +2 more sources
ORIGIN AND EVOLUTION OF THE ABUNDANCE GRADIENT ALONG THE MILKY WAY DISK
, 2009 Based on a simple model of the chemical evolution of the Milky Way disk, we investigate the disk oxygen abundance gradient and its time evolution. Two star formation rates (SFRs) are considered, one is the classical Kennicutt-Schmidt law (Psi = 0.25 ...
Chang, R. X. +3 more
core +1 more source
Chemical Evolution of the Milky Way and Chemical Tagging [PDF]
, 2022 One of the most important unsolved mysteries of astronomy is the formation and evolution of galaxies. The Milky Way is an ideal testbed for testing our understanding of galaxy evolution, as we can directly observe individual stars and their properties ...
Chen, Boquan
core
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
The evolution of carbon and oxygen in the bulge and disk of the Milky Way [PDF]
Astronomy & Astrophysics, 2009 The evolution of C and O abundances in the Milky Way can impose strong constraints on stellar nucleosynthesis and help understanding the formation and evolution of our Galaxy. The aim is to review the measured C and O abundances in the disk and bulge of the Galaxy and compare them with model predictions.
CESCUTTI, GABRIELE +3 more
openaire +3 more sources
The Milky Way - Our Home in the Universe
, 2018 Aakasha Ganga, Via Lactea or the Milky Way is our home in the Universe. The discovery of the telescope by Galileo Galilei had facilitated the sky watchers to notice a variety of geometrical forms in the sky.
Divakara Mayya
core +1 more source
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
doaj +1 more source
The GOTHAM survey: chemical evolution of Milky Way globular clusters [PDF]
, 2018 Milky Way globular clusters are excellent laboratories for stellar population detailed analysis that can be applied to extragalactic environments with the advent of the 40m-class telescopes like the ELT.
Dias, Bruno +6 more
core +1 more source
The Astrophysical JournalWe use several smoothed particle hydrodynamics+ N -body models as part of the GASTRO library to study the role of high-density star-forming clumpy regions and a single merger on the formation of the α -rich and α -poor populations in the disk galaxies ...
João A. S. Amarante +12 more
doaj +1 more source