Table · dataset · 2026
BEINGMgII. III. Cool gas reservoirs
Listed in IVOA Registry (Virtual Observatory)
We investigate the origin of intervening cool MgII absorption detected in the spectra of background quasars and the nature of associated galaxies across a broad redshift range of 0.3<=z<=1.6, and largely unexplored galactocentric distance of <~20kpc.
Description
Using nebular [OII]{lambda}{lambda}3727,3729 emission lines identified in DESI fiber spectra centered on quasar, we detect 342 galaxies at a typical detection rate of ~0.45% at z<~1, which increases with MgII equivalent width (W2796).
A significant fraction (74%) of these galaxies are associated with strong absorbers with W2796>=2{AA}. These absorbers trace galaxies spanning stellar masses of 8.4<=log(M*/M_{sun}_)<=11.6 and star formation rates of -1<=log(SFR[M_{sun}_/yr])<=2.7, located at projected galactocentric distances of 4-24 kpc. We find the average MgII absorber strength increases from 2.1{AA} to 2.8{AA} between redshifts z~0.4 and 1.2, indicating evolution in the cool gas content of galaxy halos.
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The relatively constant absorber strength with galactocentric distance implies a clumpy structure of cool gas in the circumgalactic medium. Further, we find a positive correlation between W2796 versus stellar mass (M*), and star formation rate (SFR), suggesting that the distribution of metal-enriched cool gas in the CGM is closely tied to the properties of the host galaxies. The redshift evolution of gas-phase metallicity suggests that strong MgII absorbers trace the general population of star-forming galaxies.
The velocity dispersion of the cool gas increases with halo mass, and the wide range of line-of-sight velocity offset (-389 to 364 km/s) between the galaxy systemic velocity and absorbers highlights the dynamical nature of CGM. However, the majority of this gas remains gravitationally bound to the dark matter halos, consistent with a picture of gas recycling via galactic fountains.
Links
Where it is published
- Reference page cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/709/A238 ↗
landing page · from IVOA Registry
Documentation and papers
- ADS 2026A&A...709A.238C ui.adsabs.harvard.edu/abs/2026A%26A...709A.238C ↗
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/709/a238 ↗
catalogue entry · from IVOA Registry
Topics
- Stated by source
- Optical
- 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/709/a238 | 13 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:optical | 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 |