The physical and the geometrical properties of simulated cold H i structures

Autores
Gazol, Adriana; Villagran Azuara, Marco Adrian
Año de publicación
2021
Idioma
inglés
Tipo de recurso
artículo
Estado
versión publicada
Descripción
The objective of this paper is to help shedding some light on the nature and the properties of the cold structures formed via thermal instability in the magnetized atomic interstellar medium. To this end, we searched for clumps formed in forced (magneto)hydrodynamic simulations with an initial magnetic field ranging from 0 to 8.3 μG. We statistically analysed, through the use of Kernel density estimations, the physical and the morphological properties of a sample containing ∼1500 clumps, as well as the relative alignments between the main direction of clumps and the internal velocity and magnetic field. The density (n ∼50-200 cm-3), the thermal pressure (Pth/k ∼4.9 × 103-104 K cm-3), the mean magnetic field (∼3-11 μG), and the sonic Mach number of the selected clumps have values comparable to those reported in observations. We find, however, that the cloud sample cannot be described by a single regime concerning their pressure balance and their Alfvénic Mach number. We measured the morphological properties of clumps mainly through the asphericity and the prolatness, which appear to be more sensitive than the aspect ratios. From this analysis, we find that the presence of magnetic field, even if it is weak, does qualitatively affect the morphology of the clumps by increasing the probability of having highly aspherical and highly plolate clumps by a factor of two, that is by producing more filamentary clumps. Finally, we find that the angle between the main direction of the clumps and the local magnetic field lies between ∼π/4 and π/2 and shifts to more perpendicular alignments as the intensity of this field increases, while the relative direction between the local density structure and the local magnetic field transits from parallel to perpendicular.
Fil: Gazol, Adriana. Universidad Nacional Autónoma de México; México
Fil: Villagran Azuara, Marco Adrian. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Instituto de Astronomía y Física del Espacio. - Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Instituto de Astronomía y Física del Espacio; Argentina
Materia
ISM: MAGNETIC FIELDS
ISM: STRUCTURE
MHD
Nivel de accesibilidad
acceso abierto
Condiciones de uso
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
Repositorio
CONICET Digital (CONICET)
Institución
Consejo Nacional de Investigaciones Científicas y Técnicas
OAI Identificador
oai:ri.conicet.gov.ar:11336/181175
Acceder
id CONICETDig_b5ca91cb650a5fe7f2c762810c9d96ae
oai_identifier_str oai:ri.conicet.gov.ar:11336/181175
network_acronym_str CONICETDig
repository_id_str 3498
network_name_str CONICET Digital (CONICET)
spelling The physical and the geometrical properties of simulated cold H i structuresGazol, AdrianaVillagran Azuara, Marco AdrianISM: MAGNETIC FIELDSISM: STRUCTUREMHDhttps://purl.org/becyt/ford/1.3https://purl.org/becyt/ford/1The objective of this paper is to help shedding some light on the nature and the properties of the cold structures formed via thermal instability in the magnetized atomic interstellar medium. To this end, we searched for clumps formed in forced (magneto)hydrodynamic simulations with an initial magnetic field ranging from 0 to 8.3 μG. We statistically analysed, through the use of Kernel density estimations, the physical and the morphological properties of a sample containing ∼1500 clumps, as well as the relative alignments between the main direction of clumps and the internal velocity and magnetic field. The density (n ∼50-200 cm-3), the thermal pressure (Pth/k ∼4.9 × 103-104 K cm-3), the mean magnetic field (∼3-11 μG), and the sonic Mach number of the selected clumps have values comparable to those reported in observations. We find, however, that the cloud sample cannot be described by a single regime concerning their pressure balance and their Alfvénic Mach number. We measured the morphological properties of clumps mainly through the asphericity and the prolatness, which appear to be more sensitive than the aspect ratios. From this analysis, we find that the presence of magnetic field, even if it is weak, does qualitatively affect the morphology of the clumps by increasing the probability of having highly aspherical and highly plolate clumps by a factor of two, that is by producing more filamentary clumps. Finally, we find that the angle between the main direction of the clumps and the local magnetic field lies between ∼π/4 and π/2 and shifts to more perpendicular alignments as the intensity of this field increases, while the relative direction between the local density structure and the local magnetic field transits from parallel to perpendicular.Fil: Gazol, Adriana. Universidad Nacional Autónoma de México; MéxicoFil: Villagran Azuara, Marco Adrian. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Instituto de Astronomía y Física del Espacio. - Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Instituto de Astronomía y Física del Espacio; ArgentinaOxford University Press2021-02info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionhttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdfapplication/pdfhttp://hdl.handle.net/11336/181175Gazol, Adriana; Villagran Azuara, Marco Adrian; The physical and the geometrical properties of simulated cold H i structures; Oxford University Press; Monthly Notices of the Royal Astronomical Society; 501; 2; 2-2021; 3099-31120035-8711CONICET DigitalCONICETenginfo:eu-repo/semantics/altIdentifier/doi/10.1093/mnras/staa3852info:eu-repo/semantics/openAccesshttps://creativecommons.org/licenses/by-nc-sa/2.5/ar/reponame:CONICET Digital (CONICET)instname:Consejo Nacional de Investigaciones Científicas y Técnicas2025-10-22T12:13:46Zoai:ri.conicet.gov.ar:11336/181175instacron:CONICETInstitucionalhttp://ri.conicet.gov.ar/Organismo científico-tecnológicoNo correspondehttp://ri.conicet.gov.ar/oai/requestdasensio@conicet.gov.ar; lcarlino@conicet.gov.arArgentinaNo correspondeNo correspondeNo correspondeopendoar:34982025-10-22 12:13:46.282CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicasfalse
dc.title.none.fl_str_mv The physical and the geometrical properties of simulated cold H i structures
title The physical and the geometrical properties of simulated cold H i structures
spellingShingle The physical and the geometrical properties of simulated cold H i structures
Gazol, Adriana
ISM: MAGNETIC FIELDS
ISM: STRUCTURE
MHD
title_short The physical and the geometrical properties of simulated cold H i structures
title_full The physical and the geometrical properties of simulated cold H i structures
title_fullStr The physical and the geometrical properties of simulated cold H i structures
title_full_unstemmed The physical and the geometrical properties of simulated cold H i structures
title_sort The physical and the geometrical properties of simulated cold H i structures
dc.creator.none.fl_str_mv Gazol, Adriana
Villagran Azuara, Marco Adrian
author Gazol, Adriana
author_facet Gazol, Adriana
Villagran Azuara, Marco Adrian
author_role author
author2 Villagran Azuara, Marco Adrian
author2_role author
dc.subject.none.fl_str_mv ISM: MAGNETIC FIELDS
ISM: STRUCTURE
MHD
topic ISM: MAGNETIC FIELDS
ISM: STRUCTURE
MHD
purl_subject.fl_str_mv https://purl.org/becyt/ford/1.3
https://purl.org/becyt/ford/1
dc.description.none.fl_txt_mv The objective of this paper is to help shedding some light on the nature and the properties of the cold structures formed via thermal instability in the magnetized atomic interstellar medium. To this end, we searched for clumps formed in forced (magneto)hydrodynamic simulations with an initial magnetic field ranging from 0 to 8.3 μG. We statistically analysed, through the use of Kernel density estimations, the physical and the morphological properties of a sample containing ∼1500 clumps, as well as the relative alignments between the main direction of clumps and the internal velocity and magnetic field. The density (n ∼50-200 cm-3), the thermal pressure (Pth/k ∼4.9 × 103-104 K cm-3), the mean magnetic field (∼3-11 μG), and the sonic Mach number of the selected clumps have values comparable to those reported in observations. We find, however, that the cloud sample cannot be described by a single regime concerning their pressure balance and their Alfvénic Mach number. We measured the morphological properties of clumps mainly through the asphericity and the prolatness, which appear to be more sensitive than the aspect ratios. From this analysis, we find that the presence of magnetic field, even if it is weak, does qualitatively affect the morphology of the clumps by increasing the probability of having highly aspherical and highly plolate clumps by a factor of two, that is by producing more filamentary clumps. Finally, we find that the angle between the main direction of the clumps and the local magnetic field lies between ∼π/4 and π/2 and shifts to more perpendicular alignments as the intensity of this field increases, while the relative direction between the local density structure and the local magnetic field transits from parallel to perpendicular.
Fil: Gazol, Adriana. Universidad Nacional Autónoma de México; México
Fil: Villagran Azuara, Marco Adrian. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Instituto de Astronomía y Física del Espacio. - Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Instituto de Astronomía y Física del Espacio; Argentina
description The objective of this paper is to help shedding some light on the nature and the properties of the cold structures formed via thermal instability in the magnetized atomic interstellar medium. To this end, we searched for clumps formed in forced (magneto)hydrodynamic simulations with an initial magnetic field ranging from 0 to 8.3 μG. We statistically analysed, through the use of Kernel density estimations, the physical and the morphological properties of a sample containing ∼1500 clumps, as well as the relative alignments between the main direction of clumps and the internal velocity and magnetic field. The density (n ∼50-200 cm-3), the thermal pressure (Pth/k ∼4.9 × 103-104 K cm-3), the mean magnetic field (∼3-11 μG), and the sonic Mach number of the selected clumps have values comparable to those reported in observations. We find, however, that the cloud sample cannot be described by a single regime concerning their pressure balance and their Alfvénic Mach number. We measured the morphological properties of clumps mainly through the asphericity and the prolatness, which appear to be more sensitive than the aspect ratios. From this analysis, we find that the presence of magnetic field, even if it is weak, does qualitatively affect the morphology of the clumps by increasing the probability of having highly aspherical and highly plolate clumps by a factor of two, that is by producing more filamentary clumps. Finally, we find that the angle between the main direction of the clumps and the local magnetic field lies between ∼π/4 and π/2 and shifts to more perpendicular alignments as the intensity of this field increases, while the relative direction between the local density structure and the local magnetic field transits from parallel to perpendicular.
publishDate 2021
dc.date.none.fl_str_mv 2021-02
dc.type.none.fl_str_mv info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
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://hdl.handle.net/11336/181175
Gazol, Adriana; Villagran Azuara, Marco Adrian; The physical and the geometrical properties of simulated cold H i structures; Oxford University Press; Monthly Notices of the Royal Astronomical Society; 501; 2; 2-2021; 3099-3112
0035-8711
CONICET Digital
CONICET
url http://hdl.handle.net/11336/181175
identifier_str_mv Gazol, Adriana; Villagran Azuara, Marco Adrian; The physical and the geometrical properties of simulated cold H i structures; Oxford University Press; Monthly Notices of the Royal Astronomical Society; 501; 2; 2-2021; 3099-3112
0035-8711
CONICET Digital
CONICET
dc.language.none.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv info:eu-repo/semantics/altIdentifier/doi/10.1093/mnras/staa3852
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
eu_rights_str_mv openAccess
rights_invalid_str_mv https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
dc.format.none.fl_str_mv application/pdf
application/pdf
dc.publisher.none.fl_str_mv Oxford University Press
publisher.none.fl_str_mv Oxford University Press
dc.source.none.fl_str_mv reponame:CONICET Digital (CONICET)
instname:Consejo Nacional de Investigaciones Científicas y Técnicas
reponame_str CONICET Digital (CONICET)
collection CONICET Digital (CONICET)
instname_str Consejo Nacional de Investigaciones Científicas y Técnicas
repository.name.fl_str_mv CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicas
repository.mail.fl_str_mv dasensio@conicet.gov.ar; lcarlino@conicet.gov.ar
_version_ 1846782541750599680
score 12.982451

Publicaciones similares