INSPIRE: INvestigating Stellar Population in RElics: I. Survey presentation and pilot study

[Context] Massive elliptical galaxies are thought to form through a two-phase process. At early times (z > 2), an intense and fast starburst forms blue and disk-dominated galaxies. After quenching, the remaining structures become red, compact, and massive (i.e. red nuggets). Then, a time-extended...

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Autores: Spiniello, C., Tortora, C., D'Ago, G., Coccato, Lodovico, La Barbera, F., Ferré-Mateu, Anna, Napolitano, N. R., Spavone, M., Scognamiglio, D., Arnaboldi, M., Gallazzi, A., Hunt, Leslie, Moehler, S., Radovich, Milan, Zibetti, Stefano
Tipo de recurso: artículo
Estado:Versión publicada
Fecha de publicación:2021
País:España
Institución:Consejo Superior de Investigaciones Científicas (CSIC)
Repositorio:DIGITAL.CSIC. Repositorio Institucional del CSIC
OAI Identifier:oai:digital.csic.es:10261/260370
Acceso en línea:http://hdl.handle.net/10261/260370
Access Level:acceso abierto
Palabra clave:Galaxies: formation
Galaxies: evolution
Galaxies: kinematics and dynamics
Galaxies: stellar content
Galaxies: star formation
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oai_identifier_str oai:digital.csic.es:10261/260370
network_acronym_str ES
network_name_str España
repository_id_str
dc.title.none.fl_str_mv INSPIRE: INvestigating Stellar Population in RElics: I. Survey presentation and pilot study
title INSPIRE: INvestigating Stellar Population in RElics: I. Survey presentation and pilot study
spellingShingle INSPIRE: INvestigating Stellar Population in RElics: I. Survey presentation and pilot study
Spiniello, C.
Galaxies: formation
Galaxies: evolution
Galaxies: kinematics and dynamics
Galaxies: stellar content
Galaxies: star formation
title_short INSPIRE: INvestigating Stellar Population in RElics: I. Survey presentation and pilot study
title_full INSPIRE: INvestigating Stellar Population in RElics: I. Survey presentation and pilot study
title_fullStr INSPIRE: INvestigating Stellar Population in RElics: I. Survey presentation and pilot study
title_full_unstemmed INSPIRE: INvestigating Stellar Population in RElics: I. Survey presentation and pilot study
title_sort INSPIRE: INvestigating Stellar Population in RElics: I. Survey presentation and pilot study
dc.creator.none.fl_str_mv Spiniello, C.
Tortora, C.
D'Ago, G.
Coccato, Lodovico
La Barbera, F.
Ferré-Mateu, Anna
Napolitano, N. R.
Spavone, M.
Scognamiglio, D.
Arnaboldi, M.
Gallazzi, A.
Hunt, Leslie
Moehler, S.
Radovich, Milan
Zibetti, Stefano
author Spiniello, C.
author_facet Spiniello, C.
Tortora, C.
D'Ago, G.
Coccato, Lodovico
La Barbera, F.
Ferré-Mateu, Anna
Napolitano, N. R.
Spavone, M.
Scognamiglio, D.
Arnaboldi, M.
Gallazzi, A.
Hunt, Leslie
Moehler, S.
Radovich, Milan
Zibetti, Stefano
author_role author
author2 Tortora, C.
D'Ago, G.
Coccato, Lodovico
La Barbera, F.
Ferré-Mateu, Anna
Napolitano, N. R.
Spavone, M.
Scognamiglio, D.
Arnaboldi, M.
Gallazzi, A.
Hunt, Leslie
Moehler, S.
Radovich, Milan
Zibetti, Stefano
author2_role author
author
author
author
author
author
author
author
author
author
author
author
author
author
dc.contributor.none.fl_str_mv Oxford Hintze Centre for Astrophysical Surveys (UK)
La Caixa
Bonn-Cologne Graduate School of Physics and Astronomy
Sun Yat-sen University
International Max Planck Research Schools
Consejo Superior de Investigaciones Científicas [https://ror.org/02gfc7t72]
dc.subject.none.fl_str_mv Galaxies: formation
Galaxies: evolution
Galaxies: kinematics and dynamics
Galaxies: stellar content
Galaxies: star formation
topic Galaxies: formation
Galaxies: evolution
Galaxies: kinematics and dynamics
Galaxies: stellar content
Galaxies: star formation
description [Context] Massive elliptical galaxies are thought to form through a two-phase process. At early times (z > 2), an intense and fast starburst forms blue and disk-dominated galaxies. After quenching, the remaining structures become red, compact, and massive (i.e. red nuggets). Then, a time-extended second phase, which is dominated by mergers, causes structural evolution and size growth. Given the stochastic nature of mergers, a small fraction of red nuggets survive, without any interaction, massive and compact until today: these are relic galaxies. Since this fraction depends on the processes dominating the size growth, counting relics at low-z is a valuable way of disentangling between different galaxy evolution models. [Aims] In this paper, we introduce the INvestigating Stellar Population In RElics (INSPIRE) Project, which aims to spectroscopically confirm and fully characterise a large number of relics at 0:1z0:5. We focus here on the first results based on a pilot study targeting three systems, representative of the whole sample. [Methods] For these three candidates, we extracted 1D optical spectra over an aperture of r = 0:4000, which comprises 30% of the galaxies’ light, and we obtained the line-of-sight integrated stellar velocity and velocity dispersion. We also inferred the stellar [/Fe] abundance from line-index measurements and mass-weighted age and metallicity from full-spectral fitting with single stellar population models. [Results] Two galaxies have large integrated stellar velocity dispersion values (250 km s), confirming their massive nature. They are populated by stars with super-solar metallicity and [/Fe]. Both objects have formed 80% of their stellar mass within a short (0:5:0 Gyr) initial star formation episode occurred only 1 Gyr after the Big Bang. The third galaxy has a more extendedstar formation history and a lower velocity dispersion. Thus we confirm two out of three candidates as relics. [Conclusions] This paper is the first step towards assembling the final INSPIRE catalogue that will set stringent lower limits on the number density of relics at z0:5, thus constituting a benchmark for cosmological simulations, and their predictions on number densities, sizes, masses, and dynamical characteristics of these objects.
publishDate 2021
dc.date.none.fl_str_mv 2021
2022
2022
2022
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/10261/260370
url http://hdl.handle.net/10261/260370
dc.language.none.fl_str_mv Inglés
language_invalid_str_mv Inglés
dc.relation.none.fl_str_mv http://doi.org/10.1051/0004-6361/202038936
Sí
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv application/pdf
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
collection DIGITAL.CSIC. Repositorio Institucional del CSIC
repository.name.fl_str_mv
repository.mail.fl_str_mv
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spelling INSPIRE: INvestigating Stellar Population in RElics: I. Survey presentation and pilot studySpiniello, C.Tortora, C.D'Ago, G.Coccato, LodovicoLa Barbera, F.Ferré-Mateu, AnnaNapolitano, N. R.Spavone, M.Scognamiglio, D.Arnaboldi, M.Gallazzi, A.Hunt, LeslieMoehler, S.Radovich, MilanZibetti, StefanoGalaxies: formationGalaxies: evolutionGalaxies: kinematics and dynamicsGalaxies: stellar contentGalaxies: star formation[Context] Massive elliptical galaxies are thought to form through a two-phase process. At early times (z > 2), an intense and fast starburst forms blue and disk-dominated galaxies. After quenching, the remaining structures become red, compact, and massive (i.e. red nuggets). Then, a time-extended second phase, which is dominated by mergers, causes structural evolution and size growth. Given the stochastic nature of mergers, a small fraction of red nuggets survive, without any interaction, massive and compact until today: these are relic galaxies. Since this fraction depends on the processes dominating the size growth, counting relics at low-z is a valuable way of disentangling between different galaxy evolution models. [Aims] In this paper, we introduce the INvestigating Stellar Population In RElics (INSPIRE) Project, which aims to spectroscopically confirm and fully characterise a large number of relics at 0:1z0:5. We focus here on the first results based on a pilot study targeting three systems, representative of the whole sample. [Methods] For these three candidates, we extracted 1D optical spectra over an aperture of r = 0:4000, which comprises 30% of the galaxies’ light, and we obtained the line-of-sight integrated stellar velocity and velocity dispersion. We also inferred the stellar [/Fe] abundance from line-index measurements and mass-weighted age and metallicity from full-spectral fitting with single stellar population models. [Results] Two galaxies have large integrated stellar velocity dispersion values (250 km s), confirming their massive nature. They are populated by stars with super-solar metallicity and [/Fe]. Both objects have formed 80% of their stellar mass within a short (0:5:0 Gyr) initial star formation episode occurred only 1 Gyr after the Big Bang. The third galaxy has a more extendedstar formation history and a lower velocity dispersion. Thus we confirm two out of three candidates as relics. [Conclusions] This paper is the first step towards assembling the final INSPIRE catalogue that will set stringent lower limits on the number density of relics at z0:5, thus constituting a benchmark for cosmological simulations, and their predictions on number densities, sizes, masses, and dynamical characteristics of these objects.CS is supported by a Hintze Fellowship at the Oxford Centre for Astrophysical Surveys, which is funded through generous support from the Hintze Family Charitable Foundation. C.S. is also very grateful to Ortwin Gerhard and his ?Dynamics Group? at the Max-Planck-Institut f?r Extraterrestrische Physik (MPE, Garching by Munich) for interesting and constructive discussions. C.T., A.G., L.H. and S.Z. acknowledge funding from the INAF PRIN-SKA 2017 programme 1.05.01.88.04. G.D. acknowledges support from CONICYT project Basal AFB-170002. AFM has received financial support through the Postdoctoral Junior Leader Fellowship Programme from La Caixa Banking Foundation (LCF/BQ/LI18/11630007). N.R.N. acknowledges financial support from the One hundred top talent programme of Sun Yat-sen University, Grant N. 71000-18841229. D.S. is a member of the International Max Planck Research School (IMPRS) for Astronomy and Astrophysics at the Universities of Bonn and Cologne.Peer reviewedEDP SciencesOxford Hintze Centre for Astrophysical Surveys (UK)La CaixaBonn-Cologne Graduate School of Physics and AstronomySun Yat-sen UniversityInternational Max Planck Research SchoolsConsejo Superior de Investigaciones Científicas [https://ror.org/02gfc7t72]2022202220212022info:eu-repo/semantics/articlehttp://purl.org/coar/resource_type/c_6501Publisher's versioninfo:eu-repo/semantics/publishedVersionapplication/pdfhttp://hdl.handle.net/10261/260370reponame:DIGITAL.CSIC. Repositorio Institucional del CSICinstname:Consejo Superior de Investigaciones Científicas (CSIC)Ingléshttp://doi.org/10.1051/0004-6361/202038936Síinfo:eu-repo/semantics/openAccessoai:digital.csic.es:10261/2603702026-05-22T06:33:51Z
score 15,811543

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