Table · dataset · 2026
M74 TST gri images
Listed in IVOA Registry (Virtual Observatory)
Galaxy formation models predict that galaxies grow inside-out, becoming larger over time.
Description
While observations broadly support this paradigm, the nature and timescales of this growth remain poorly constrained. We report the discovery of an extremely faint and young (~600Myr) stellar component in the outer regions of the nearby galaxy Messier 74 (M74).
Using deep optical imaging from the TST telescope at the Teide Observatory, reaching surface brightness limits of ~30-31.5mag/arcsec^2^ in the g, r, and i bands, we detect stellar emission extending well beyond the previously known disc radius of ~14kpc. This newly identified component reaches galactocentric distances of ~30kpc, effectively doubling the known size of the stellar disc and matching the extent of the HI disc.
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The revised size of M74 places it in the upper envelope of the mass-size relations. The young age of the outer stellar population suggests a recent episode of disc growth, potentially occurring on timescales shorter than ~1Gyr. We discuss a possible scenario in which a past flyby interaction with UGC 1176 may have triggered this extended star formation.
Further studies of galaxies with similarly deep imaging will be key to determining whether such rapid outer disc growth is common or exceptional.
Links
Where it is published
- Reference page cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/713/A10 ↗
landing page · from IVOA Registry
Documentation and papers
- ADS 2026A&A...713A..10R ui.adsabs.harvard.edu/abs/2026A%26A...713A..10R ↗
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/713/a10 ↗
catalogue entry · from IVOA Registry
Topics
- Stated by source
- Optical
- From keywords
- Astronomy & Astrophysics
Provenance · 1 source records, 10 field assertions
| Source | Key | Last seen | Raw |
|---|---|---|---|
| IVOA Registry (Virtual Observatory) | ivo://cds.vizier/j/a+a/713/a10 | 14 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 | |
| concepts[modality].local:modality:image | enrichment · IVOA Registry | keyword-concept-rules@1.0.0 | title+description (65%) |
| concepts[modality].local:modality:imaging | enrichment · IVOA Registry | keyword-concept-rules@1.0.0 | title+description (75%) |
| 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 |