Chemodynamics of green pea galaxies - I. Outflows and turbulence driving the escape of ionizing photons and chemical enrichment
We investigate the ionized gas kinematics, physical properties, and chemical abundances of Sloan Digital Sky Survey J142947, a Green Pea galaxy at redshift z∼ 0.17 with strong, double-peak Ly α emission and indirect evidence of Lyman continuum (LyC) leakage. Using high-dispersion spectroscopy, we pe...
| Autores: | , , , , , , , , |
|---|---|
| Formato: | artículo |
| Estado: | Versión publicada |
| Fecha de publicación: | 2020 |
| País: | España |
| Recursos: | Consejo Superior de Investigaciones Científicas (CSIC) |
| Repositorio: | DIGITAL.CSIC. Repositorio Institucional del CSIC |
| OAI Identifier: | oai:digital.csic.es:10261/213094 |
| Acesso em linha: | http://hdl.handle.net/10261/213094 |
| Access Level: | acceso abierto |
| Palavra-chave: | Galaxies: abundances Galaxies: dwarf Galaxies: evolution Galaxies: kinematics and dynamics Galaxies: starburst Cosmology: reionization |
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| dc.title.none.fl_str_mv |
Chemodynamics of green pea galaxies - I. Outflows and turbulence driving the escape of ionizing photons and chemical enrichment |
| title |
Chemodynamics of green pea galaxies - I. Outflows and turbulence driving the escape of ionizing photons and chemical enrichment |
| spellingShingle |
Chemodynamics of green pea galaxies - I. Outflows and turbulence driving the escape of ionizing photons and chemical enrichment Hogarth, L. Galaxies: abundances Galaxies: dwarf Galaxies: evolution Galaxies: kinematics and dynamics Galaxies: starburst Cosmology: reionization |
| title_short |
Chemodynamics of green pea galaxies - I. Outflows and turbulence driving the escape of ionizing photons and chemical enrichment |
| title_full |
Chemodynamics of green pea galaxies - I. Outflows and turbulence driving the escape of ionizing photons and chemical enrichment |
| title_fullStr |
Chemodynamics of green pea galaxies - I. Outflows and turbulence driving the escape of ionizing photons and chemical enrichment |
| title_full_unstemmed |
Chemodynamics of green pea galaxies - I. Outflows and turbulence driving the escape of ionizing photons and chemical enrichment |
| title_sort |
Chemodynamics of green pea galaxies - I. Outflows and turbulence driving the escape of ionizing photons and chemical enrichment |
| dc.creator.none.fl_str_mv |
Hogarth, L. Amorín, R. Vílchez Medina, José Manuel Hägele, Guillermo F. Cardaci, M.. Pérez Montero, Enrique Firpo, V. Jaskot, A. Chávez, R |
| author |
Hogarth, L. |
| author_facet |
Hogarth, L. Amorín, R. Vílchez Medina, José Manuel Hägele, Guillermo F. Cardaci, M.. Pérez Montero, Enrique Firpo, V. Jaskot, A. Chávez, R |
| author_role |
author |
| author2 |
Amorín, R. Vílchez Medina, José Manuel Hägele, Guillermo F. Cardaci, M.. Pérez Montero, Enrique Firpo, V. Jaskot, A. Chávez, R |
| author2_role |
author author author author author author author author |
| dc.contributor.none.fl_str_mv |
European Research Council Ministerio de Economía y Competitividad (España) European Commission Gemini Observatory National Science Foundation (US) Consejo Superior de Investigaciones Científicas [https://ror.org/02gfc7t72] |
| dc.subject.none.fl_str_mv |
Galaxies: abundances Galaxies: dwarf Galaxies: evolution Galaxies: kinematics and dynamics Galaxies: starburst Cosmology: reionization |
| topic |
Galaxies: abundances Galaxies: dwarf Galaxies: evolution Galaxies: kinematics and dynamics Galaxies: starburst Cosmology: reionization |
| description |
We investigate the ionized gas kinematics, physical properties, and chemical abundances of Sloan Digital Sky Survey J142947, a Green Pea galaxy at redshift z∼ 0.17 with strong, double-peak Ly α emission and indirect evidence of Lyman continuum (LyC) leakage. Using high-dispersion spectroscopy, we perform a multicomponent analysis of emission-line profiles. Our model consistently fits all lines as a narrow component with intrinsic velocity dispersion σ ∼ 40 km s-1, and two broader blue-shifted components with σ ∼ 90 and ∼ 250 km s-1. We find electron densities and temperatures, ionization conditions, and direct O/H and N/O abundances for each component. A highly ionized, metal-poor, young and compact starburst dominates narrow emission, showing evidence of hard radiation fields and elevated N/O. The blue-shifted broader components are consistent with highly turbulent, possibly clumpy ionized gas at the base of a strong photoionized outflow, which accounts for ≳50 per cent of the integrated emission-line fluxes. The outflow is dense and metal-enriched compared to the H ii regions, with expansion velocities larger than those obtained from UV interstellar absorption lines under standard assumptions. Some of these metals may be able to escape, with outflows loading factors comparable to those found in high-z galaxies of similar SFR/Area. Our findings depict a two-stage starburst picture; hard radiation fields from young star clusters illuminate a turbulent and clumpy ISM that has been eroded by SNe feedback. Whilst UV data suggest an extended Ly α halo with high average H i column density, LyC photons could only escape from SDSS J142947 through low H i density channels or filaments in the ISM approaching density-bounded conditions, traced by outflowing gas. © 2020 The Author(s) Published by Oxford University Press on behalf of the Royal Astronomical Society |
| publishDate |
2020 |
| dc.date.none.fl_str_mv |
2020 2020 2020 |
| 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 |
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article |
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publishedVersion |
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http://hdl.handle.net/10261/213094 |
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http://hdl.handle.net/10261/213094 |
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Inglés |
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Inglés |
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info:eu-repo/semantics/openAccess |
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openAccess |
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Oxford University Press |
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Oxford University Press |
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reponame:DIGITAL.CSIC. Repositorio Institucional del CSIC instname:Consejo Superior de Investigaciones Científicas (CSIC) |
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DIGITAL.CSIC. Repositorio Institucional del CSIC |
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DIGITAL.CSIC. Repositorio Institucional del CSIC |
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1869424497777442816 |
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Chemodynamics of green pea galaxies - I. Outflows and turbulence driving the escape of ionizing photons and chemical enrichmentHogarth, L.Amorín, R.Vílchez Medina, José ManuelHägele, Guillermo F.Cardaci, M..Pérez Montero, EnriqueFirpo, V.Jaskot, A.Chávez, RGalaxies: abundancesGalaxies: dwarfGalaxies: evolutionGalaxies: kinematics and dynamicsGalaxies: starburstCosmology: reionizationWe investigate the ionized gas kinematics, physical properties, and chemical abundances of Sloan Digital Sky Survey J142947, a Green Pea galaxy at redshift z∼ 0.17 with strong, double-peak Ly α emission and indirect evidence of Lyman continuum (LyC) leakage. Using high-dispersion spectroscopy, we perform a multicomponent analysis of emission-line profiles. Our model consistently fits all lines as a narrow component with intrinsic velocity dispersion σ ∼ 40 km s-1, and two broader blue-shifted components with σ ∼ 90 and ∼ 250 km s-1. We find electron densities and temperatures, ionization conditions, and direct O/H and N/O abundances for each component. A highly ionized, metal-poor, young and compact starburst dominates narrow emission, showing evidence of hard radiation fields and elevated N/O. The blue-shifted broader components are consistent with highly turbulent, possibly clumpy ionized gas at the base of a strong photoionized outflow, which accounts for ≳50 per cent of the integrated emission-line fluxes. The outflow is dense and metal-enriched compared to the H ii regions, with expansion velocities larger than those obtained from UV interstellar absorption lines under standard assumptions. Some of these metals may be able to escape, with outflows loading factors comparable to those found in high-z galaxies of similar SFR/Area. Our findings depict a two-stage starburst picture; hard radiation fields from young star clusters illuminate a turbulent and clumpy ISM that has been eroded by SNe feedback. Whilst UV data suggest an extended Ly α halo with high average H i column density, LyC photons could only escape from SDSS J142947 through low H i density channels or filaments in the ISM approaching density-bounded conditions, traced by outflowing gas. © 2020 The Author(s) Published by Oxford University Press on behalf of the Royal Astronomical SocietyThis study is based on observations made with the William Hersche Telescope operated on the island of La Palma by the Isaac Newton Group of Telescopes in the Spanish Observatorio del Roque de los Muchachos of the Instituto de Astrof´ısica de Canarias. We thank the anonymous referee for her/his helpful report. We would like to express our gratitude to David and Bridget Jacob for their support through the Astronomy Summer Internship Programme at University of Cambridge. Their generous funding made this project possible. LH thanks the hospitality of the Kavli Institute for Cosmology Cambridge during her Internship and subsequent visits. We would also like to thank Dr. A. Saintonge for her guidance during the compiliation of this paper. RA is also grateful to Roberto Maiolino and Polychronis Papaderos for useful discussions on this project. RA thanks the support of DIDULS (project 030503072341) and the ERC Advance Grant ‘QUENCH’. JVM and EPM acknowledge the support by the Spanish MINECO project Estallidos 6 AYA2016- 79724-C4, and by the Spanish Science Ministry ‘Centro de Excelencia Severo Ochoa Program’ under grant SEV-2017-0709. Supported by the international Gemini Observatory, a program of NSF’s OIR Lab, which is managed by the Association of Universities for Research in Astronomy (AURA) under a cooperative agreement with the National Science Foundation, on behalf of the Gemini partnership of Argentina, Brazil, Canada, Chile, the Republic of Korea, and the United States of America.Peer reviewedOxford University PressEuropean Research CouncilMinisterio de Economía y Competitividad (España)European CommissionGemini ObservatoryNational Science Foundation (US)Consejo Superior de Investigaciones Científicas [https://ror.org/02gfc7t72]202020202020info:eu-repo/semantics/articlehttp://purl.org/coar/resource_type/c_6501Publisher's versioninfo:eu-repo/semantics/publishedVersionhttp://hdl.handle.net/10261/213094reponame: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/MINECO/Plan Estatal de Investigación Científica y Técnica y de Innovación 2013-2016/AYA2016-79724-C4info:eu-repo/grantAgreement/MINECO/Plan Estatal de Investigación Científica y Técnica y de Innovación 2013-2016/SEV-2017-0709http://dx.doi.org/ 10.1093/mnras/staa851Síinfo:eu-repo/semantics/openAccessoai:digital.csic.es:10261/2130942026-05-22T06:33:51Z |
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15,811543 |