CLASSY XII: nitrogen enrichment shaped by gas density and feedback

We investigate the chemical evolution of N/O using a sample of 45 local star-forming galaxies from the CLASSY survey. This sample spans a wide range of galaxy properties, with robust determinations of nitrogen and oxygen abundances via the direct- method. We explore how N/O relates to density struct...

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Detalles Bibliográficos
Autores: Arellano-Córdova, K. Z., Berg, D. A., Mingozzi, M., James, B. L., Vincenzo, F., Rogers, N. S. J., Skillman, E. D., Amorín, R., Cullen, F., Flury, S. R., Abril-Melgarejo, V., Chisholm, J., Heckman, T., Hayes, M. J., Hernandez, S., Kumari, N., Kobayashi, C., Leitherer, C., Martin, C. L., Martinez, Z., Nanayakkara, T., Parker, K. S., Senchyna, P., Scarlata, C., Stephenson, M. G., Wofford, A., Xu, X., Zhu, P.
Tipo de recurso: artículo
Estado:Versión publicada
Fecha de publicación:2025
País:España
Institución:Consejo Superior de Investigaciones Científicas (CSIC)
Repositorio:DIGITAL.CSIC. Repositorio Institucional del CSIC
OAI Identifier:oai:dnet:digitalcsic_::d837cc92204379aaad45bb08c6e4ce02
Acceso en línea:http://hdl.handle.net/10261/430197
Access Level:acceso abierto
Palabra clave:Galaxies: abundances
Galaxies: dwarf
Galaxies: evolution
Galaxies: ISM
Galaxies: kinematics and dynamics
Descripción
Sumario:We investigate the chemical evolution of N/O using a sample of 45 local star-forming galaxies from the CLASSY survey. This sample spans a wide range of galaxy properties, with robust determinations of nitrogen and oxygen abundances via the direct- method. We explore how N/O relates to density structure, stellar mass, star formation rate (SFR), stellar age, compactness, and gas kinematics. In addition, we compare our results with those of galaxies at where N/O ratios were derived from optical or UV nitrogen lines, aiming to identify chemical enrichment pathways across cosmic time. Our analysis shows that the N/O-O/H relation in CLASSY galaxies aligns with the trends seen in local galaxies and extragalactic H ii regions, and that galaxies at exhibit similar N/O values, indicating no significant redshift evolution in N/O for a fixed metallicity. We identify a significant correlation between electron density ([S ii]) and N/O, suggesting that density structure contributes to the scatter in the N/O-O/H relation. The CLASSY galaxies with high SFRs or compact star formation show elevated N/O, though no strong correlation with stellar mass is found. We also find that high-velocity outflows (km s-1) and low mass-loading factors are linked to elevated N/O, indicating that feedback plays a significant role. These results highlight the importance of density, star formation, and feedback from young stellar populations in shaping N/O enrichment and provide key insights for interpreting high- galaxies observed with James Webb Space Telescope. © The Author(s) 2025. Published by Oxford University Press on behalf of Royal Astronomical Society.

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