Table · dataset · 2026
CO-dark gas in compact emission-line galaxies
Listed in IVOA Registry (Virtual Observatory)
Green Pea and Blueberry galaxies are compact, low-metallicity starbursts that provide nearby analogs of high-redshift star-forming systems.
Description
We investigate whether their weak CO emission reflects genuinely small molecular reservoirs or CO-dark gas where independent tracers are available. We compiled 60 strong [OIII]{lambda}5007 compact emission-line galaxies with partially overlapping gas-tracer coverage: ^12^CO(1-0) observations from the Delingha 13.7m telescope, HI 21cm data from Arecibo, GBT, and FAST (ten detections and 41 upper limits), and Herschel/PACS [CII] {lambda}158um data (five detections and four upper limits after excluding merger systems).
Quantitative conclusions are drawn only from detected or physically constraining subsets. Molecular masses were estimated using a metallicity-dependent CO-to-H_2_ conversion factor and the [CII]-to-H_2_ calibration for low-metallicity dwarf galaxies. Two CO upper limits are deep enough to constrain the expected molecular reservoir.
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We also removed major mergers and examined the large-scale environment using the SDSS DR7 VoidFinder catalog. For the five [CII]-detected sources, we find M_H2_^[CII]^~10^9^.0-10^9.7^M_{sun}_ and a median molecular gas depletion time of {tau}_dep,H2_~0.16Gyr, shorter than the ~1Gyr typical of main-sequence galaxies. HI-detected sources have a median atomic depletion time of {tau}_dep,H_~2.6Gyr.
The detected subsets show high gas fractions and short depletion times consistent with rapid gas cycling, but the [CII] result remains limited by small-number statistics. About 39% of the volume-matched sample lies in cosmic voids. CO alone misses a substantial fraction of the star-forming fuel in these low-metallicity starbursts.
Combined HI, [CII], and deep CO constraints are needed to characterize their interstellar medium and CO-dark molecular component.
Links
Where it is published
- Reference page cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/712/A47 ↗
landing page · from IVOA Registry
Documentation and papers
- ADS 2026A&A...712A..47L ui.adsabs.harvard.edu/abs/2026A%26A...712A..47L ↗
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/712/a47 ↗
catalogue entry · from IVOA Registry
Topics
- Stated by source
- Optical
- From keywords
- Astronomy & Astrophysics
- Inferred from text
- Astronomical sciences 71%
Provenance · 1 source records, 9 field assertions
| Source | Key | Last seen | Raw |
|---|---|---|---|
| IVOA Registry (Virtual Observatory) | ivo://cds.vizier/j/a+a/712/a47 | 14 d ago | JSON v1 |
| Field | Assertion | Extractor | Evidence |
|---|---|---|---|
| access_level | source · IVOA Registry | connector:ivoa_registry@1.0.0 | |
| concepts[field].anzsrc:group:5101 | enrichment · IVOA Registry | taxonomy-embedding@1.0.0 | title+keywords+description (71%) |
| 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 |