Galaxy pairs in cosmological simulations: Effects of interactions on star formation

Autores
Perez, María Josefa; Tissera, Patricia Beatriz; Lambas, D. G.; Scannapieco, C.
Año de publicación
2006
Idioma
inglés
Tipo de recurso
artículo
Estado
versión publicada
Descripción
We carried out a statistical analysis of galaxy pairs in hydrodynamical ACDM simulations. We focus on the triggering of star formation by interactions and analysed the enhancement of star formation activity in terms of orbital parameters. By comparing the data to a suitable sample of simulated galaxies without a nearby companion, we find that close encounters (r < 30 kpc h-1 ) may effectively induce star formation. However, our results suggest that the stability properties of systems and the spatial proximity are both relevant factors in the process of triggering star formation by tidal interactions. In order to assess the effects of projection and spurious pairs in observational samples, we constructed and analysed samples of pairs of galaxies in the simulations obtained in projection. We found a good agreement with observational results with a threshold at rp ∼ 25 kpc h-1 for interactions to statistically enhance star formation activity. For pairs within rp < 100 kpc h-1, we estimated a ∼27% contamination by spurious pairs, reduced to ∼19% for close systems. We also found that spurious pairs more strongly affect high density regions, with 17% of spurious pairs detected for low density regions compared to 33% found in high density ones. We analysed the dependence of star formation on environment by defining the usual projected density parameter for both pairs and isolated galaxies in the simulations. We find the expected star formation-local density relation for both galaxies in pairs and without a close companion, with a stronger density dependence for close pairs which suggests a relevant role for interactions in driving this relation.
Facultad de Ciencias Astronómicas y Geofísicas
Materia
Ciencias Astronómicas
Cosmology: theory
Galaxies: interactions
Galaxy: formation
Methods: numerical
Nivel de accesibilidad
acceso abierto
Condiciones de uso
http://creativecommons.org/licenses/by-nc-sa/4.0/
Repositorio
SEDICI (UNLP)
Institución
Universidad Nacional de La Plata
OAI Identificador
oai:sedici.unlp.edu.ar:10915/83203
Acceder
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oai_identifier_str oai:sedici.unlp.edu.ar:10915/83203
network_acronym_str SEDICI
repository_id_str 1329
network_name_str SEDICI (UNLP)
spelling Galaxy pairs in cosmological simulations: Effects of interactions on star formationPerez, María JosefaTissera, Patricia BeatrizLambas, D. G.Scannapieco, C.Ciencias AstronómicasCosmology: theoryGalaxies: interactionsGalaxy: formationMethods: numericalWe carried out a statistical analysis of galaxy pairs in hydrodynamical ACDM simulations. We focus on the triggering of star formation by interactions and analysed the enhancement of star formation activity in terms of orbital parameters. By comparing the data to a suitable sample of simulated galaxies without a nearby companion, we find that close encounters (r < 30 kpc h<SUP>-1</SUP> ) may effectively induce star formation. However, our results suggest that the stability properties of systems and the spatial proximity are both relevant factors in the process of triggering star formation by tidal interactions. In order to assess the effects of projection and spurious pairs in observational samples, we constructed and analysed samples of pairs of galaxies in the simulations obtained in projection. We found a good agreement with observational results with a threshold at r<SUB>p</SUB> ∼ 25 kpc h<SUP>-1</SUP> for interactions to statistically enhance star formation activity. For pairs within r<SUB>p</SUB> < 100 kpc h<SUP>-1</SUP>, we estimated a ∼27% contamination by spurious pairs, reduced to ∼19% for close systems. We also found that spurious pairs more strongly affect high density regions, with 17% of spurious pairs detected for low density regions compared to 33% found in high density ones. We analysed the dependence of star formation on environment by defining the usual projected density parameter for both pairs and isolated galaxies in the simulations. We find the expected star formation-local density relation for both galaxies in pairs and without a close companion, with a stronger density dependence for close pairs which suggests a relevant role for interactions in driving this relation.Facultad de Ciencias Astronómicas y Geofísicas2006info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionArticulohttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdf23-32http://sedici.unlp.edu.ar/handle/10915/83203enginfo:eu-repo/semantics/altIdentifier/issn/0004-6361info:eu-repo/semantics/altIdentifier/doi/10.1051/0004-6361:20053507info:eu-repo/semantics/openAccesshttp://creativecommons.org/licenses/by-nc-sa/4.0/Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International (CC BY-NC-SA 4.0)reponame:SEDICI (UNLP)instname:Universidad Nacional de La Platainstacron:UNLP2025-09-10T12:18:27Zoai:sedici.unlp.edu.ar:10915/83203Institucionalhttp://sedici.unlp.edu.ar/Universidad públicaNo correspondehttp://sedici.unlp.edu.ar/oai/snrdalira@sedici.unlp.edu.arArgentinaNo correspondeNo correspondeNo correspondeopendoar:13292025-09-10 12:18:27.796SEDICI (UNLP) - Universidad Nacional de La Platafalse
dc.title.none.fl_str_mv Galaxy pairs in cosmological simulations: Effects of interactions on star formation
title Galaxy pairs in cosmological simulations: Effects of interactions on star formation
spellingShingle Galaxy pairs in cosmological simulations: Effects of interactions on star formation
Perez, María Josefa
Ciencias Astronómicas
Cosmology: theory
Galaxies: interactions
Galaxy: formation
Methods: numerical
title_short Galaxy pairs in cosmological simulations: Effects of interactions on star formation
title_full Galaxy pairs in cosmological simulations: Effects of interactions on star formation
title_fullStr Galaxy pairs in cosmological simulations: Effects of interactions on star formation
title_full_unstemmed Galaxy pairs in cosmological simulations: Effects of interactions on star formation
title_sort Galaxy pairs in cosmological simulations: Effects of interactions on star formation
dc.creator.none.fl_str_mv Perez, María Josefa
Tissera, Patricia Beatriz
Lambas, D. G.
Scannapieco, C.
author Perez, María Josefa
author_facet Perez, María Josefa
Tissera, Patricia Beatriz
Lambas, D. G.
Scannapieco, C.
author_role author
author2 Tissera, Patricia Beatriz
Lambas, D. G.
Scannapieco, C.
author2_role author
author
author
dc.subject.none.fl_str_mv Ciencias Astronómicas
Cosmology: theory
Galaxies: interactions
Galaxy: formation
Methods: numerical
topic Ciencias Astronómicas
Cosmology: theory
Galaxies: interactions
Galaxy: formation
Methods: numerical
dc.description.none.fl_txt_mv We carried out a statistical analysis of galaxy pairs in hydrodynamical ACDM simulations. We focus on the triggering of star formation by interactions and analysed the enhancement of star formation activity in terms of orbital parameters. By comparing the data to a suitable sample of simulated galaxies without a nearby companion, we find that close encounters (r < 30 kpc h<SUP>-1</SUP> ) may effectively induce star formation. However, our results suggest that the stability properties of systems and the spatial proximity are both relevant factors in the process of triggering star formation by tidal interactions. In order to assess the effects of projection and spurious pairs in observational samples, we constructed and analysed samples of pairs of galaxies in the simulations obtained in projection. We found a good agreement with observational results with a threshold at r<SUB>p</SUB> ∼ 25 kpc h<SUP>-1</SUP> for interactions to statistically enhance star formation activity. For pairs within r<SUB>p</SUB> < 100 kpc h<SUP>-1</SUP>, we estimated a ∼27% contamination by spurious pairs, reduced to ∼19% for close systems. We also found that spurious pairs more strongly affect high density regions, with 17% of spurious pairs detected for low density regions compared to 33% found in high density ones. We analysed the dependence of star formation on environment by defining the usual projected density parameter for both pairs and isolated galaxies in the simulations. We find the expected star formation-local density relation for both galaxies in pairs and without a close companion, with a stronger density dependence for close pairs which suggests a relevant role for interactions in driving this relation.
Facultad de Ciencias Astronómicas y Geofísicas
description We carried out a statistical analysis of galaxy pairs in hydrodynamical ACDM simulations. We focus on the triggering of star formation by interactions and analysed the enhancement of star formation activity in terms of orbital parameters. By comparing the data to a suitable sample of simulated galaxies without a nearby companion, we find that close encounters (r < 30 kpc h<SUP>-1</SUP> ) may effectively induce star formation. However, our results suggest that the stability properties of systems and the spatial proximity are both relevant factors in the process of triggering star formation by tidal interactions. In order to assess the effects of projection and spurious pairs in observational samples, we constructed and analysed samples of pairs of galaxies in the simulations obtained in projection. We found a good agreement with observational results with a threshold at r<SUB>p</SUB> ∼ 25 kpc h<SUP>-1</SUP> for interactions to statistically enhance star formation activity. For pairs within r<SUB>p</SUB> < 100 kpc h<SUP>-1</SUP>, we estimated a ∼27% contamination by spurious pairs, reduced to ∼19% for close systems. We also found that spurious pairs more strongly affect high density regions, with 17% of spurious pairs detected for low density regions compared to 33% found in high density ones. We analysed the dependence of star formation on environment by defining the usual projected density parameter for both pairs and isolated galaxies in the simulations. We find the expected star formation-local density relation for both galaxies in pairs and without a close companion, with a stronger density dependence for close pairs which suggests a relevant role for interactions in driving this relation.
publishDate 2006
dc.date.none.fl_str_mv 2006
dc.type.none.fl_str_mv info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
Articulo
http://purl.org/coar/resource_type/c_6501
info:ar-repo/semantics/articulo
format article
status_str publishedVersion
dc.identifier.none.fl_str_mv http://sedici.unlp.edu.ar/handle/10915/83203
url http://sedici.unlp.edu.ar/handle/10915/83203
dc.language.none.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv info:eu-repo/semantics/altIdentifier/issn/0004-6361
info:eu-repo/semantics/altIdentifier/doi/10.1051/0004-6361:20053507
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
http://creativecommons.org/licenses/by-nc-sa/4.0/
Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International (CC BY-NC-SA 4.0)
eu_rights_str_mv openAccess
rights_invalid_str_mv http://creativecommons.org/licenses/by-nc-sa/4.0/
Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International (CC BY-NC-SA 4.0)
dc.format.none.fl_str_mv application/pdf
23-32
dc.source.none.fl_str_mv reponame:SEDICI (UNLP)
instname:Universidad Nacional de La Plata
instacron:UNLP
reponame_str SEDICI (UNLP)
collection SEDICI (UNLP)
instname_str Universidad Nacional de La Plata
instacron_str UNLP
institution UNLP
repository.name.fl_str_mv SEDICI (UNLP) - Universidad Nacional de La Plata
repository.mail.fl_str_mv alira@sedici.unlp.edu.ar
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score 12.993085

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