Extreme emission-line galaxies out to z 1 in zCOSMOS: I. Sample and characterization of global properties
Context. The study of large and representative samples of low-metallicity star-forming galaxies at different cosmic epochs is of great interest to the detailed understanding of the assembly history and evolution of low-mass galaxies. Aims. We present a thorough characterization of a large sample of...
| Autores: | , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , |
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| Tipo de recurso: | artículo |
| Estado: | Versión publicada |
| Fecha de publicación: | 2015 |
| País: | España |
| Institución: | Consejo Superior de Investigaciones Científicas (CSIC) |
| Repositorio: | DIGITAL.CSIC. Repositorio Institucional del CSIC |
| OAI Identifier: | oai:digital.csic.es:10261/386377 |
| Acceso en línea: | http://hdl.handle.net/10261/386377 |
| Access Level: | acceso abierto |
| Palabra clave: | Galaxies: evolution Galaxies: fundamental parameters Galaxies: abundances Galaxies: starburst Galaxies: irregular Galaxies: star formation |
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| dc.title.none.fl_str_mv |
Extreme emission-line galaxies out to z 1 in zCOSMOS: I. Sample and characterization of global properties |
| title |
Extreme emission-line galaxies out to z 1 in zCOSMOS: I. Sample and characterization of global properties |
| spellingShingle |
Extreme emission-line galaxies out to z 1 in zCOSMOS: I. Sample and characterization of global properties Amorín, R. Galaxies: evolution Galaxies: fundamental parameters Galaxies: abundances Galaxies: starburst Galaxies: irregular Galaxies: star formation |
| title_short |
Extreme emission-line galaxies out to z 1 in zCOSMOS: I. Sample and characterization of global properties |
| title_full |
Extreme emission-line galaxies out to z 1 in zCOSMOS: I. Sample and characterization of global properties |
| title_fullStr |
Extreme emission-line galaxies out to z 1 in zCOSMOS: I. Sample and characterization of global properties |
| title_full_unstemmed |
Extreme emission-line galaxies out to z 1 in zCOSMOS: I. Sample and characterization of global properties |
| title_sort |
Extreme emission-line galaxies out to z 1 in zCOSMOS: I. Sample and characterization of global properties |
| dc.creator.none.fl_str_mv |
Amorín, R. Pérez Montero, E. Contini, T. Vílchez Medina, José Manuel Bolzonella, M. Tasca, L. A. M. Lamareille, F. Zamorani, G. Maier, C. Carollo, C. M. Kneib, J. -P. Le Fèvre, O. Lilly, S. Mainieri, V. Renzini, A. Scodeggio, M. Bardelli, S. Bongiorno, A. Caputi, K. Cucciati, O. de la Torre, S. de Ravel, L. Franzetti, P. Garilli, B. Iovino, A. Kampczyk, P. Knobel, C. Kovač, K. Le Borgne, J. -F. Le Brun, V. Mignoli, M. Pellò, R. Peng, Y. Presotto, V. Ricciardelli, E. Silverman, J. D. Tanaka, M. Tresse, L. Vergani, D. Zucca, E. |
| author |
Amorín, R. |
| author_facet |
Amorín, R. Pérez Montero, E. Contini, T. Vílchez Medina, José Manuel Bolzonella, M. Tasca, L. A. M. Lamareille, F. Zamorani, G. Maier, C. Carollo, C. M. Kneib, J. -P. Le Fèvre, O. Lilly, S. Mainieri, V. Renzini, A. Scodeggio, M. Bardelli, S. Bongiorno, A. Caputi, K. Cucciati, O. de la Torre, S. de Ravel, L. Franzetti, P. Garilli, B. Iovino, A. Kampczyk, P. Knobel, C. Kovač, K. Le Borgne, J. -F. Le Brun, V. Mignoli, M. Pellò, R. Peng, Y. Presotto, V. Ricciardelli, E. Silverman, J. D. Tanaka, M. Tresse, L. Vergani, D. Zucca, E. |
| author_role |
author |
| author2 |
Pérez Montero, E. Contini, T. Vílchez Medina, José Manuel Bolzonella, M. Tasca, L. A. M. Lamareille, F. Zamorani, G. Maier, C. Carollo, C. M. Kneib, J. -P. Le Fèvre, O. Lilly, S. Mainieri, V. Renzini, A. Scodeggio, M. Bardelli, S. Bongiorno, A. Caputi, K. Cucciati, O. de la Torre, S. de Ravel, L. Franzetti, P. Garilli, B. Iovino, A. Kampczyk, P. Knobel, C. Kovač, K. Le Borgne, J. -F. Le Brun, V. Mignoli, M. Pellò, R. Peng, Y. Presotto, V. Ricciardelli, E. Silverman, J. D. Tanaka, M. Tresse, L. Vergani, D. Zucca, E. |
| author2_role |
author author author author author author author author author author author author author author author author author author author author author author author author author author author author author author author author author author author author author author author |
| dc.contributor.none.fl_str_mv |
Ministerio de Ciencia e Innovación (España) Junta de Andalucía European Commission Centre National D'Etudes Spatiales (France) Consejo Superior de Investigaciones Científicas [https://ror.org/02gfc7t72] |
| dc.subject.none.fl_str_mv |
Galaxies: evolution Galaxies: fundamental parameters Galaxies: abundances Galaxies: starburst Galaxies: irregular Galaxies: star formation |
| topic |
Galaxies: evolution Galaxies: fundamental parameters Galaxies: abundances Galaxies: starburst Galaxies: irregular Galaxies: star formation |
| description |
Context. The study of large and representative samples of low-metallicity star-forming galaxies at different cosmic epochs is of great interest to the detailed understanding of the assembly history and evolution of low-mass galaxies. Aims. We present a thorough characterization of a large sample of 183 extreme emission-line galaxies (EELGs) at redshift 0.11 ≤z ≤0.93 selected from the 20k zCOSMOS bright survey because of their unusually large emission line equivalent widths. Methods. We use multiwavelength COSMOS photometry, HST-ACS I-band imaging, and optical zCOSMOS spectroscopy to derive the main global properties of star-forming EELGs, such as sizes, stellar masses, star formation rates (SFR), and reliable oxygen abundances using both "direct" and "strong-line" methods. Results. The EELGs are extremely compact (r<inf>50</inf> 1.3 kpc), low-mass (M∗ 10<sup>7</sup>-10<sup>10</sup> M) galaxies forming stars at unusually high specific star formation rates (sSFR ≈ SFR/M∗ up to 10<sup>-7</sup> yr<sup>-1</sup>) compared to main sequence star-forming galaxies of the same stellar mass and redshift. At rest-frame UV wavelengths, the EELGs are luminous and show high surface brightness and include strong Lyα emitters, as revealed by GALEX spectroscopy. We show that zCOSMOS EELGs are high-ionization, low-metallicity systems, with median 12+ log(O/H) = 8.16 ± 0.21 (0.2 Z) including a handful of extremely metal-deficient (<0.1 Z) EELGs. While 80% of the EELGs show non-axisymmetric morphologies, including clumpy and cometary or tadpole galaxies, we find that 29% of them show additional low-surface-brightness features, which strongly suggests recent or ongoing interactions. As star-forming dwarfs in the local Universe, EELGs are most often found in relative isolation. While only very few EELGs belong to compact groups, almost one third of them are found in spectroscopically confirmed loose pairs or triplets. Conclusions. The zCOSMOS EELGs are galaxies caught in a transient and probably early period of their evolution, where they are efficiently building up a significant fraction of their present-day stellar mass in an ongoing, galaxy-wide starburst. Therefore, the EELGs constitute an ideal benchmark for comparison studies between low- and high-redshift low-mass star-forming galaxies. © ESO, 2015. |
| publishDate |
2015 |
| dc.date.none.fl_str_mv |
2015 2025 2025 2025 |
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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/10261/386377 |
| url |
http://hdl.handle.net/10261/386377 |
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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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EDP Sciences |
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EDP Sciences |
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DIGITAL.CSIC. Repositorio Institucional del CSIC |
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1869403585724284928 |
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Extreme emission-line galaxies out to z 1 in zCOSMOS: I. Sample and characterization of global propertiesAmorín, R.Pérez Montero, E.Contini, T.Vílchez Medina, José ManuelBolzonella, M.Tasca, L. A. M.Lamareille, F.Zamorani, G.Maier, C.Carollo, C. M.Kneib, J. -P.Le Fèvre, O.Lilly, S.Mainieri, V.Renzini, A.Scodeggio, M.Bardelli, S.Bongiorno, A.Caputi, K.Cucciati, O.de la Torre, S.de Ravel, L.Franzetti, P.Garilli, B.Iovino, A.Kampczyk, P.Knobel, C.Kovač, K.Le Borgne, J. -F.Le Brun, V.Mignoli, M.Pellò, R.Peng, Y.Presotto, V.Ricciardelli, E.Silverman, J. D.Tanaka, M.Tresse, L.Vergani, D.Zucca, E.Galaxies: evolutionGalaxies: fundamental parametersGalaxies: abundancesGalaxies: starburstGalaxies: irregularGalaxies: star formationContext. The study of large and representative samples of low-metallicity star-forming galaxies at different cosmic epochs is of great interest to the detailed understanding of the assembly history and evolution of low-mass galaxies. Aims. We present a thorough characterization of a large sample of 183 extreme emission-line galaxies (EELGs) at redshift 0.11 ≤z ≤0.93 selected from the 20k zCOSMOS bright survey because of their unusually large emission line equivalent widths. Methods. We use multiwavelength COSMOS photometry, HST-ACS I-band imaging, and optical zCOSMOS spectroscopy to derive the main global properties of star-forming EELGs, such as sizes, stellar masses, star formation rates (SFR), and reliable oxygen abundances using both "direct" and "strong-line" methods. Results. The EELGs are extremely compact (r<inf>50</inf> 1.3 kpc), low-mass (M∗ 10<sup>7</sup>-10<sup>10</sup> M) galaxies forming stars at unusually high specific star formation rates (sSFR ≈ SFR/M∗ up to 10<sup>-7</sup> yr<sup>-1</sup>) compared to main sequence star-forming galaxies of the same stellar mass and redshift. At rest-frame UV wavelengths, the EELGs are luminous and show high surface brightness and include strong Lyα emitters, as revealed by GALEX spectroscopy. We show that zCOSMOS EELGs are high-ionization, low-metallicity systems, with median 12+ log(O/H) = 8.16 ± 0.21 (0.2 Z) including a handful of extremely metal-deficient (<0.1 Z) EELGs. While 80% of the EELGs show non-axisymmetric morphologies, including clumpy and cometary or tadpole galaxies, we find that 29% of them show additional low-surface-brightness features, which strongly suggests recent or ongoing interactions. As star-forming dwarfs in the local Universe, EELGs are most often found in relative isolation. While only very few EELGs belong to compact groups, almost one third of them are found in spectroscopically confirmed loose pairs or triplets. Conclusions. The zCOSMOS EELGs are galaxies caught in a transient and probably early period of their evolution, where they are efficiently building up a significant fraction of their present-day stellar mass in an ongoing, galaxy-wide starburst. Therefore, the EELGs constitute an ideal benchmark for comparison studies between low- and high-redshift low-mass star-forming galaxies. © ESO, 2015.We thank the referee for her/his deep and thorough reports which significantly contributed to improving this manuscript. We also gratefully acknowledge Polychronis Papaderos, Marco Castellano, Veronica Sommariva, Jorge Sánchez Almeida and Casiana Muñoz-Tuñón for a careful reading of the paper and the helpful comments and suggestions provided. We also thank M. Maseda and A. van der Wel for kindly providing us assistance with their data. This work was partially funded by the Spanish MICINN under the Consolider-Ingenio 2010 Program grant CSD2006-00070: First Science with the GTC 9, and by projects AYA2007-67965-C03-02 and AYA2010-21887-C04-01 of the Spanish National Plan for Astronomy and Astrophysics, and by the project TIC114 Galaxias y Cosmología of the Junta de Andalucía (Spain). R.A. acknowledges the contribution of the FP7 SPACE project ASTRODEEP (Ref. No: 312725), supported by the European Commission. This work has also been partially supported by the CNRS-INSU and its Programmes Nationaux de Galaxies et de Cosmologie (France). The VLT-VIMOS observations have been carried out on guaranteed time (GTO) allocated by the European Southern Observatory (ESO) to the VIRMOS consortium, under a contractual agreement between the Centre National de la Recherche Scientifique of France, heading a consortium of French and Italian institutes, and ESO, to design, manufacture and test the VIMOS instrument. Based on observations obtained with MegaPrime/MegaCam, a joint project of CFHT and CEA/DAPNIA, at the Canada-France-Hawaii Telescope (CFHT) which is operated by the National Research Council (NRC) of Canada, the Institut National des Science de l’Univers of the Centre National de la Recherche Scientifique (CNRS) of France and the University of Hawaii. This work is based in part on data products produced at TERAPIX and the Canadian Astronomy Data Centre as part of the Canada-France-Hawaii Telescope Legacy Survey, a collaboration project of NRC and CNRS.Peer reviewedEDP SciencesMinisterio de Ciencia e Innovación (España)Junta de AndalucíaEuropean CommissionCentre National D'Etudes Spatiales (France)Consejo Superior de Investigaciones Científicas [https://ror.org/02gfc7t72]2025202520152025info:eu-repo/semantics/articlehttp://purl.org/coar/resource_type/c_6501Publisher's versioninfo:eu-repo/semantics/publishedVersionhttp://hdl.handle.net/10261/386377reponame:DIGITAL.CSIC. Repositorio Institucional del CSICinstname:Consejo Superior de Investigaciones Científicas (CSIC)Inglés#PLACEHOLDER_PARENT_METADATA_VALUE##PLACEHOLDER_PARENT_METADATA_VALUE##PLACEHOLDER_PARENT_METADATA_VALUE#info:eu-repo/grantAgreement/EC/FP7/312725info:eu-repo/grantAgreement/MEC//AYA2007-67965-C03-02info:eu-repo/grantAgreement/MICINN//AYA2010-21887-C04-01http://dx.doi.org/10.1051/0004-6361/201322786Síinfo:eu-repo/semantics/openAccessoai:digital.csic.es:10261/3863772026-05-22T06:33:51Z |
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15,812429 |