Table · dataset · 2026
Gaia-Enceladus/Sausage population 1 and 2 stars
Listed in IVOA Registry (Virtual Observatory)
The accretion of Gaia-Enceladus/Sausage (GES) onto the Milky Way is one of the most prominent features of the Galactic halo revealed by the combination of the Gaia satellite and large spectroscopic surveys.
Description
This massive accretion is responsible for a notable amount of the Milky Way stellar mass and was significant enough to alter the formation history and the morphology of the MW. In this work, we aim to analyse the selection of stars identified in Berni et al. (2025A&A...700A.160B) in GES with different kinematics and chemical properties to test the hypothesis of a two-phase accretion event.
We apply several statistical tests to assess the significance of the separation between the two populations in GES. We then employ Galactic chemical evolution models to investigate the origin of the chemical differences encountered in the analysis. We confirm the presence of two distinct populations, with consistently different dynamical and chemical properties.
Read the rest (2 more)
The low-energy population seems to show higher overall abundances, whereas the high-energy one may be more metal-poor. We attribute this difference to the presence of at least two separate populations of stars within Gaia-Enceladus, likely associated with the innermost (low-energy) and outermost (high-energy) regions of the progenitor. The models successfully reproduce the patterns in metallicity and [alpha/M] distributions in an inside-out scenario.
Our analysis supports the presence of a former metallicity gradient in Gaia-Enceladus, and reinforces the interpretation of its accretion as a multi-passage event through the Milky Way disc.
Links
Where it is published
- Reference page cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/707/A242 ↗
landing page · from IVOA Registry
Documentation and papers
- ADS 2026A&A...707A.242B ui.adsabs.harvard.edu/abs/2026A%26A...707A.242B ↗
publication · from IVOA Registry
Catalogue records · 2
- VOResource record dc.g-vo.org/oai.xml?verb=GetRecord&metadataPrefix=ivo_vor&identifier=ivo%3… ↗
metadata API · from IVOA Registry
- Registry record (GAVO) dc.g-vo.org/I/cds.vizier/j/a%2Ba/707/a242 ↗
catalogue entry · from IVOA Registry
Topics
- Stated by source
- Infrared
- From keywords
- Astronomy & Astrophysics
Provenance · 1 source records, 8 field assertions
| Source | Key | Last seen | Raw |
|---|---|---|---|
| IVOA Registry (Virtual Observatory) | ivo://cds.vizier/j/a+a/707/a242 | 15 d ago | JSON v1 |
| Field | Assertion | Extractor | Evidence |
|---|---|---|---|
| access_level | source · IVOA Registry | connector:ivoa_registry@1.0.0 | |
| concepts[field].local:field:astronomy | mapping · IVOA Registry | connector:ivoa_registry@1.0.0 | |
| concepts[modality].ivoa_waveband:infrared | source · IVOA Registry | connector:ivoa_registry@1.0.0 | |
| description | source · IVOA Registry | connector:ivoa_registry@1.0.0 | rr.resource.res_description |
| license_text | source · IVOA Registry | connector:ivoa_registry@1.0.0 | |
| publication_date | source · IVOA Registry | connector:ivoa_registry@1.0.0 | |
| title | source · IVOA Registry | connector:ivoa_registry@1.0.0 | rr.resource.res_title |
| updated_date | source · IVOA Registry | connector:ivoa_registry@1.0.0 |