The Generation and Dissipation of Interstellar Turbulence: Results from Large-Scale High-Resolution Simulations

Detalhes bibliográficos
Autor(a) principal: de Avillez, Miguel
Data de Publicação: 2007
Outros Autores: Breitschwerdt, Dieter
Tipo de documento: Artigo
Idioma: eng
Título da fonte: Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
Texto Completo: http://hdl.handle.net/10174/5642
https://doi.org/10.1086/521222
Resumo: We study, by means of adaptive mesh refinement hydro- and magnetohydrodynamic simulations that cover a wide range of scales (from kiloparsec to subparsec), the dimension of the most dissipative structures and the injection scale of turbulent interstellar gas, which we find to be about 75 pc, in agreement with observations. This is, however, smaller than the average size of superbubbles but consistent with significant density and pressure changes in the ISM, which leads to the breakup of bubbles locally and hence to the injection of turbulence. The scalings of the structure functions are consistent with log-Poisson statistics of supersonic turbulence, where energy is dissipated mainly through shocks. Our simulations are different from previous ones by other authors, since (1) we do not assume an isothermal gas but have temperature variations of several orders of magnitude, and (2) we have no artificial forcing of the fluid with some ad hoc Fourier spectrum but drive turbulence by stellar explosions at the Galactic rate, self-regulated by density and temperature thresholds imposed on the ISM gas.
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spelling The Generation and Dissipation of Interstellar Turbulence: Results from Large-Scale High-Resolution SimulationsGalaxy: evolutionGalaxy: generalGalaxy: structurehydrodynamicsISM: structureWe study, by means of adaptive mesh refinement hydro- and magnetohydrodynamic simulations that cover a wide range of scales (from kiloparsec to subparsec), the dimension of the most dissipative structures and the injection scale of turbulent interstellar gas, which we find to be about 75 pc, in agreement with observations. This is, however, smaller than the average size of superbubbles but consistent with significant density and pressure changes in the ISM, which leads to the breakup of bubbles locally and hence to the injection of turbulence. The scalings of the structure functions are consistent with log-Poisson statistics of supersonic turbulence, where energy is dissipated mainly through shocks. Our simulations are different from previous ones by other authors, since (1) we do not assume an isothermal gas but have temperature variations of several orders of magnitude, and (2) we have no artificial forcing of the fluid with some ad hoc Fourier spectrum but drive turbulence by stellar explosions at the Galactic rate, self-regulated by density and temperature thresholds imposed on the ISM gas.The University of Chicago Press/American Astronomical Society/The Astrophysical Journal Letters2012-11-15T14:40:12Z2012-11-152007-08-01T00:00:00Zinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articlehttp://hdl.handle.net/10174/5642http://hdl.handle.net/10174/5642https://doi.org/10.1086/521222engL35-L3835-38665The Astrophysical Journal Lettersmavillez@galaxy.lca.uevora.ptbreitschwerdt@astro.univie.ac.at343de Avillez, MiguelBreitschwerdt, Dieterinfo:eu-repo/semantics/openAccessreponame:Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)instname:Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informaçãoinstacron:RCAAP2024-01-03T18:44:39Zoai:dspace.uevora.pt:10174/5642Portal AgregadorONGhttps://www.rcaap.pt/oai/openaireopendoar:71602024-03-20T01:00:40.607137Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) - Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informaçãofalse
dc.title.none.fl_str_mv The Generation and Dissipation of Interstellar Turbulence: Results from Large-Scale High-Resolution Simulations
title The Generation and Dissipation of Interstellar Turbulence: Results from Large-Scale High-Resolution Simulations
spellingShingle The Generation and Dissipation of Interstellar Turbulence: Results from Large-Scale High-Resolution Simulations
de Avillez, Miguel
Galaxy: evolution
Galaxy: general
Galaxy: structure
hydrodynamics
ISM: structure
title_short The Generation and Dissipation of Interstellar Turbulence: Results from Large-Scale High-Resolution Simulations
title_full The Generation and Dissipation of Interstellar Turbulence: Results from Large-Scale High-Resolution Simulations
title_fullStr The Generation and Dissipation of Interstellar Turbulence: Results from Large-Scale High-Resolution Simulations
title_full_unstemmed The Generation and Dissipation of Interstellar Turbulence: Results from Large-Scale High-Resolution Simulations
title_sort The Generation and Dissipation of Interstellar Turbulence: Results from Large-Scale High-Resolution Simulations
author de Avillez, Miguel
author_facet de Avillez, Miguel
Breitschwerdt, Dieter
author_role author
author2 Breitschwerdt, Dieter
author2_role author
dc.contributor.author.fl_str_mv de Avillez, Miguel
Breitschwerdt, Dieter
dc.subject.por.fl_str_mv Galaxy: evolution
Galaxy: general
Galaxy: structure
hydrodynamics
ISM: structure
topic Galaxy: evolution
Galaxy: general
Galaxy: structure
hydrodynamics
ISM: structure
description We study, by means of adaptive mesh refinement hydro- and magnetohydrodynamic simulations that cover a wide range of scales (from kiloparsec to subparsec), the dimension of the most dissipative structures and the injection scale of turbulent interstellar gas, which we find to be about 75 pc, in agreement with observations. This is, however, smaller than the average size of superbubbles but consistent with significant density and pressure changes in the ISM, which leads to the breakup of bubbles locally and hence to the injection of turbulence. The scalings of the structure functions are consistent with log-Poisson statistics of supersonic turbulence, where energy is dissipated mainly through shocks. Our simulations are different from previous ones by other authors, since (1) we do not assume an isothermal gas but have temperature variations of several orders of magnitude, and (2) we have no artificial forcing of the fluid with some ad hoc Fourier spectrum but drive turbulence by stellar explosions at the Galactic rate, self-regulated by density and temperature thresholds imposed on the ISM gas.
publishDate 2007
dc.date.none.fl_str_mv 2007-08-01T00:00:00Z
2012-11-15T14:40:12Z
2012-11-15
dc.type.status.fl_str_mv info:eu-repo/semantics/publishedVersion
dc.type.driver.fl_str_mv info:eu-repo/semantics/article
format article
status_str publishedVersion
dc.identifier.uri.fl_str_mv http://hdl.handle.net/10174/5642
http://hdl.handle.net/10174/5642
https://doi.org/10.1086/521222
url http://hdl.handle.net/10174/5642
https://doi.org/10.1086/521222
dc.language.iso.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv L35-L38
35-38
665
The Astrophysical Journal Letters
mavillez@galaxy.lca.uevora.pt
breitschwerdt@astro.univie.ac.at
343
dc.rights.driver.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.publisher.none.fl_str_mv The University of Chicago Press/American Astronomical Society/The Astrophysical Journal Letters
publisher.none.fl_str_mv The University of Chicago Press/American Astronomical Society/The Astrophysical Journal Letters
dc.source.none.fl_str_mv reponame:Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
instname:Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação
instacron:RCAAP
instname_str Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação
instacron_str RCAAP
institution RCAAP
reponame_str Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
collection Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
repository.name.fl_str_mv Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) - Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação
repository.mail.fl_str_mv
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