Spatially resolved chemodynamics of the starburst dwarf galaxy CGCG 007-025: evidence for recent accretion of metal-poor gas Article Swipe
M. G. del Valle-Espinosa
,
Rubén Sánchez-Janssen
,
R. Amorín
,
Vital Fernández
,
J. Sánchez Alméida
,
B. García‐Lorenzo
,
P. Papaderos
·
YOU?
·
· 2023
· Open Access
·
· DOI: https://doi.org/10.1093/mnras/stad1087
YOU?
·
· 2023
· Open Access
·
· DOI: https://doi.org/10.1093/mnras/stad1087
Nearby metal-poor starburst dwarf galaxies present a unique opportunity to probe the physics of high-density star formation with a detail and sensitivity unmatched by any observation of the high-z Universe. Here, we present the first results from a chemodynamical study of the nearby, gas-rich starburst dwarf CGCG 007-025. We use VLT/MUSE integral field spectroscopy to characterize the properties of the star-forming (SF) gas, from its metal content to its kinematics. The star formation rate (SFR) surface density presents a clumpy distribution, with the brightest knot hosting a 5 Myr young, Wolf–Rayet (WR) population (revealed by the presence of the characteristic 5808 Å WR bump). The ionized gas kinematics are dominated by disordered motions. A superposition of a narrow (σ ≈ 30km s−1), intermediate (150 km s−1), and broad (1000 km s−1) kinematic components are needed to model the emission-line profiles in the brightest SF region, suggesting the presence of energetic outflows from massive stars. The gas-phase metallicity of the galaxy spans 0.6 dex and displays a strong anticorrelation with SFR surface density, dropping to 12 + log(O/H) = 7.7 in the central SF knot. The spatially resolved BPTs indicate the gas is being ionized purely by SF processes. Finally, the anticorrelation between the SFR and the gas metallicity points out to accretion of metal-poor gas as the origin of the recent off-centre starburst, in which the infalling material ignites the SF episode.
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- Type
- article
- Language
- en
- Landing Page
- https://doi.org/10.1093/mnras/stad1087
- https://academic.oup.com/mnras/advance-article-pdf/doi/10.1093/mnras/stad1087/49914451/stad1087.pdf
- OA Status
- hybrid
- Cited By
- 14
- References
- 185
- Related Works
- 10
- OpenAlex ID
- https://openalex.org/W4366003255
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Raw OpenAlex JSON
- OpenAlex ID
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https://openalex.org/W4366003255Canonical identifier for this work in OpenAlex
- DOI
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https://doi.org/10.1093/mnras/stad1087Digital Object Identifier
- Title
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Spatially resolved chemodynamics of the starburst dwarf galaxy CGCG 007-025: evidence for recent accretion of metal-poor gasWork title
- Type
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articleOpenAlex work type
- Language
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enPrimary language
- Publication year
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2023Year of publication
- Publication date
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2023-04-14Full publication date if available
- Authors
-
M. G. del Valle-Espinosa, Rubén Sánchez-Janssen, R. Amorín, Vital Fernández, J. Sánchez Alméida, B. García‐Lorenzo, P. PapaderosList of authors in order
- Landing page
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https://doi.org/10.1093/mnras/stad1087Publisher landing page
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https://academic.oup.com/mnras/advance-article-pdf/doi/10.1093/mnras/stad1087/49914451/stad1087.pdfDirect link to full text PDF
- Open access
-
YesWhether a free full text is available
- OA status
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hybridOpen access status per OpenAlex
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https://academic.oup.com/mnras/advance-article-pdf/doi/10.1093/mnras/stad1087/49914451/stad1087.pdfDirect OA link when available
- Concepts
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Physics, Astrophysics, Metallicity, Star formation, Galaxy, Astronomy, Stars, Dwarf galaxy, Accretion (finance)Top concepts (fields/topics) attached by OpenAlex
- Cited by
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14Total citation count in OpenAlex
- Citations by year (recent)
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2025: 9, 2024: 5Per-year citation counts (last 5 years)
- References (count)
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185Number of works referenced by this work
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10Other works algorithmically related by OpenAlex
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