Spatially resolved chemodynamics of the starburst dwarf galaxy CGCG 007-025: evidence for recent accretion of metal-poor gas
Date
2023-04-21
Journal Title
Journal ISSN
Volume Title
Publisher
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
Abstract
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 angstrom WR bump). The ionized gas kinematics are dominated by disordered motions. A superposition of a narrow (sigma approximate to 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.
Description
Keywords
galaxies: dwarf, galaxies: interactions, galaxies: starburst, STAR-FORMING GALAXIES, EMISSION-LINE GALAXIES, BLUE COMPACT GALAXIES, WOLF-RAYET GALAXIES, SIMILAR-TO 0.9, MASS-METALLICITY, CHEMICAL EVOLUTION, PHASE METALLICITY, SCALING RELATIONS, TADPOLE GALAXIES
Citation
del Valle-Espinosa, M. G., Sánchez-Janssen, R., Amorín, R., Fernández, V., Almeida, J. S., Lorenzo, B. G., & Papaderos, P. (2023). Spatially resolved chemodynamics of the starburst dwarf galaxy CGCG 007-025: evidence for recent accretion of metal-poor gas. Monthly Notices of the Royal Astronomical Society, 522(2), 2089-2104. https://doi.org/10.1093/mnras/stad1087