Tracing ionized gas kinematics in Lyman-break Analogs Implications for star formation compactness and outflow properties

Context. The ionized gas kinematics of low-mass starburst galaxies is a tracer of galaxy interactions and feedback processes, which are key for understanding massive star formation, chemical enrichment, and galaxy evolution.

Detalles Bibliográficos
Autores: León Contreras, A., Amorín, R., Llerena, M., Fernández, V.
Tipo de recurso: artículo
Estado:Versión publicada
Fecha de publicación:2026
País:España
Institución:Consejo Superior de Investigaciones Científicas (CSIC)
Repositorio:DIGITAL.CSIC. Repositorio Institucional del CSIC
OAI Identifier:oai:dnet:digitalcsic_::d9f110b4f1fcff9f7253dbdd961813fd
Acceso en línea:http://hdl.handle.net/10261/427510
Access Level:acceso abierto
Palabra clave:Galaxies: ISM
Galaxies: kinematics and dynamics
Galaxies: starburst
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dc.title.none.fl_str_mv Tracing ionized gas kinematics in Lyman-break Analogs Implications for star formation compactness and outflow properties
title Tracing ionized gas kinematics in Lyman-break Analogs Implications for star formation compactness and outflow properties
spellingShingle Tracing ionized gas kinematics in Lyman-break Analogs Implications for star formation compactness and outflow properties
León Contreras, A.
Galaxies: ISM
Galaxies: kinematics and dynamics
Galaxies: starburst
title_short Tracing ionized gas kinematics in Lyman-break Analogs Implications for star formation compactness and outflow properties
title_full Tracing ionized gas kinematics in Lyman-break Analogs Implications for star formation compactness and outflow properties
title_fullStr Tracing ionized gas kinematics in Lyman-break Analogs Implications for star formation compactness and outflow properties
title_full_unstemmed Tracing ionized gas kinematics in Lyman-break Analogs Implications for star formation compactness and outflow properties
title_sort Tracing ionized gas kinematics in Lyman-break Analogs Implications for star formation compactness and outflow properties
dc.creator.none.fl_str_mv León Contreras, A.
Amorín, R.
Llerena, M.
Fernández, V.
author León Contreras, A.
author_facet León Contreras, A.
Amorín, R.
Llerena, M.
Fernández, V.
author_role author
author2 Amorín, R.
Llerena, M.
Fernández, V.
author2_role author
author
author
dc.contributor.none.fl_str_mv Fondo Nacional de Desarrollo Científico y Tecnológico (Chile)
Agencia Estatal de Investigación (España)
Agencia Nacional de Investigación y Desarrollo (Chile)
Ministerio de Ciencia e Innovación (España)
European Commission
Istituto Nazionale di Astrofisica
Consejo Superior de Investigaciones Científicas [https://ror.org/02gfc7t72]
dc.subject.none.fl_str_mv Galaxies: ISM
Galaxies: kinematics and dynamics
Galaxies: starburst
topic Galaxies: ISM
Galaxies: kinematics and dynamics
Galaxies: starburst
description Context. The ionized gas kinematics of low-mass starburst galaxies is a tracer of galaxy interactions and feedback processes, which are key for understanding massive star formation, chemical enrichment, and galaxy evolution.
publishDate 2026
dc.date.none.fl_str_mv 2026
2026
2026
dc.type.none.fl_str_mv info:eu-repo/semantics/article
http://purl.org/coar/resource_type/c_6501
Publisher's version
info:eu-repo/semantics/publishedVersion
format article
status_str publishedVersion
dc.identifier.none.fl_str_mv http://hdl.handle.net/10261/427510
url http://hdl.handle.net/10261/427510
dc.language.none.fl_str_mv Inglés
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info:eu-repo/grantAgreement/AEI/Plan Estatal de Investigación Científica y Técnica y de Innovación 2021-2023/PID2023-147386NB-I00
info:eu-repo/grantAgreement/AEI/Plan Estatal de Investigación Científica y Técnica y de Innovación 2021-2023/CEX2021-001131-S
http://dx.doi.org/10.1051/0004-6361/202556138
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dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.publisher.none.fl_str_mv EDP Sciences
publisher.none.fl_str_mv EDP Sciences
dc.source.none.fl_str_mv reponame:DIGITAL.CSIC. Repositorio Institucional del CSIC
instname:Consejo Superior de Investigaciones Científicas (CSIC)
instname_str Consejo Superior de Investigaciones Científicas (CSIC)
reponame_str DIGITAL.CSIC. Repositorio Institucional del CSIC
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spelling Tracing ionized gas kinematics in Lyman-break Analogs Implications for star formation compactness and outflow propertiesLeón Contreras, A.Amorín, R.Llerena, M.Fernández, V.Galaxies: ISMGalaxies: kinematics and dynamicsGalaxies: starburstContext. The ionized gas kinematics of low-mass starburst galaxies is a tracer of galaxy interactions and feedback processes, which are key for understanding massive star formation, chemical enrichment, and galaxy evolution.Aims. We studied the ionized gas kinematics and outflow properties of a sample of Lyman-break analogs (LBAs) at z ∼ 0.1 − 0.3; these LBAs are characterized by compact morphologies, high UV luminosities, and strong emission lines, which are common at higher redshifts.Methods. We used high-resolution VLT/X-shooter spectra of 14 compact, UV-luminous LBAs to model the complex [O III]λλ4959,5007 Å and Balmer line profiles with multi-Gaussian fits.Results. The kinematics of LBAs are complex, with emission lines best reproduced by narrow (σ < 90 km s−1) and broad (σ > 90 km s−1) components in all galaxies. The narrow-line kinematics is highly turbulent, likely driven by massive star-forming clumps. The luminosities and line ratios of the narrow components are typical of giant H II regions. We interpret the broader components as ionized outflows driven by strong winds of massive stars and supernovae. In galaxies with highly complex profiles and disturbed morphologies, ongoing interactions or mergers are found to contribute to the broad components. We find outflow velocities (v out) in the range ∼200 km s−1 to 500 km s−1. Simple models yield outflow mass rates of 0.20–2.72 M ⊙ yr−1 and mass-loading factors (η) of ∼0.03–0.81. We find that η shows a mild increasing trend at lower stellar masses, in agreement with previous observational studies and predictions from FIRE-2 and Illustris-TNG simulations. Compact starburst morphologies can modulate the η-M ★ relation, which is strongly correlated as ΣSFR -η, i.e., more compact starbursts drive stronger outflows. We find a good agreement with similar findings in star-forming galaxies at high redshifts (z ∼ 2 − 9), including those from recent JWST observations.Conclusions. Our results highlight the relevance of detailed studies of the ionized gas kinematics in local UV-compact starbursts to improve our understanding of feedback processes in low-mass, rapidly star-forming galaxies. © The Authors 2026.We are grateful to Verónica Firpo for her valuable guid- ance on emission-line fitting at the early stages of this work. We thank Alberto Saldana-Lopez for providing tables with comparison data. AL and RA acknowl- edge support from ULS/DIDULS grant PTE2153851. AL and RA acknowl- edge support from ANID Fondecyt 1202007. RA acknowledges support of grant PID2023-147386NB-I00 funded by MICIU/AEI/10.13039/501100011033 and by ERDF/EU, from grant PID2022-136598NBC32 “Estallidos8”, and the Severo Ochoa grant CEX2021-001131-S to the IAA-CSIC. MLl acknowledges support from the INAF Large Grant 2022 “Extragalactic Surveys with JWST” (PI L. Pentericci), the PRIN 2022 MUR project 2022CB3PJ3 – First Light And Galaxy aSsembly (FLAGS) funded by the European Union – Next Generation EU, and the INAF Mini-grant “Galaxies in the epoch of Reionization and their analogs at lower redshift” (PI M. Llerena).With funding from the Spanish government through the "Severo Ochoa Centre of Excelence" accreditation (CEX2021-001131-S)Peer reviewedEDP SciencesFondo Nacional de Desarrollo Científico y Tecnológico (Chile)Agencia Estatal de Investigación (España)Agencia Nacional de Investigación y Desarrollo (Chile)Ministerio de Ciencia e Innovación (España)European CommissionIstituto Nazionale di AstrofisicaConsejo Superior de Investigaciones Científicas [https://ror.org/02gfc7t72]202620262026info:eu-repo/semantics/articlehttp://purl.org/coar/resource_type/c_6501Publisher's versioninfo:eu-repo/semantics/publishedVersionhttp://hdl.handle.net/10261/427510reponame:DIGITAL.CSIC. Repositorio Institucional del CSICinstname:Consejo Superior de Investigaciones Científicas (CSIC)Inglés#PLACEHOLDER_PARENT_METADATA_VALUE##PLACEHOLDER_PARENT_METADATA_VALUE#info:eu-repo/grantAgreement/AEI/Plan Estatal de Investigación Científica y Técnica y de Innovación 2021-2023/PID2023-147386NB-I00info:eu-repo/grantAgreement/AEI/Plan Estatal de Investigación Científica y Técnica y de Innovación 2021-2023/CEX2021-001131-Shttp://dx.doi.org/10.1051/0004-6361/202556138Síinfo:eu-repo/semantics/openAccessoai:dnet:digitalcsic_::d9f110b4f1fcff9f7253dbdd961813fd2026-05-22T06:33:51Z
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