SPH simulations of clumps formation by dissipative collision of molecular clouds - I. Non magnetic case

Página do item simplificado
dc.contributor.authorMarinho, E. P.
dc.contributor.authorLepine, JRD
dc.contributor.institutionUniversidade Estadual Paulista (Unesp)
dc.contributor.institutionUniversidade de São Paulo (USP)
dc.date.accessioned2014-02-26T17:09:29Z
dc.date.accessioned2014-05-20T14:16:04Z
dc.date.available2014-02-26T17:09:29Z
dc.date.available2014-05-20T14:16:04Z
dc.date.issued2000-02-01
dc.description.abstractComputer experiments of interstellar cloud collisions were performed with a new smoothed-particle-hydrodynamics (SPH) code. The SPH quantities were calculated by using spatially adaptive smoothing lengths and the SPH fluid equations of motion were solved by means of a hierarchical multiple time-scale leapfrog. Such a combination of methods allows the code to deal with a large range of hydrodynamic quantities. A careful treatment of gas cooling by H, H(2), CO and H II, as well as a heating mechanism by cosmic rays and by H(2) production on grains surface, were also included in the code. The gas model reproduces approximately the typical environment of dark molecular clouds. The experiments were performed by impinging two dynamically identical spherical clouds onto each other with a relative velocity of 10 km s(-1) but with a different impact parameter for each case. Each object has an initial density profile obeying an r(-1)-law with a cutoff radius of 10 pc and with an initial temperature of 20 K. As a main result, cloud-cloud collision triggers fragmentation but in expense of a large amount of energy dissipated, which occurred in the head-on case only. Off-center collision did not allow remnants to fragment along the considered time (similar to 6 Myr). However, it dissipated a considerable amount of orbital energy. Structures as small as 0.1 pc, with densities of similar to 10(4) cm(-3), were observed in the more energetic collision.en
dc.description.affiliationUNESP, Dept Estatist Matemat Aplicada & Computac, Inst Geociencias & Ciências Exatas, BR-13500230 Rio Claro, SP, Brazil
dc.description.affiliationUniv São Paulo, Dept Astron, Inst Astron & Geofis, BR-04301904 São Paulo, Brazil
dc.description.affiliationUnespUNESP, Dept Estatist Matemat Aplicada & Computac, Inst Geociencias & Ciências Exatas, BR-13500230 Rio Claro, SP, Brazil
dc.format.extent165-179
dc.identifierhttp://dx.doi.org/10.1051/aas:2000327
dc.identifier.citationAstronomy & Astrophysics Supplement Series. Les Ulis Cedex A: Edp Sciences S A, v. 142, n. 1, p. 165-179, 2000.
dc.identifier.doi10.1051/aas:2000327
dc.identifier.issn0365-0138
dc.identifier.lattes4276078473559775
dc.identifier.urihttp://hdl.handle.net/11449/24826
dc.identifier.wosWOS:000085838900019
dc.language.isoeng
dc.publisherEdp Sciences S A
dc.relation.ispartofAstronomy & Astrophysics Supplement Series
dc.rights.accessRightsAcesso restrito
dc.sourceWeb of Science
dc.subjecthydrodynamicspt
dc.subjectshock wavespt
dc.subjectmethods : numericalpt
dc.subjectISM : cloudspt
dc.subjectISM : kinematics and dynamicspt
dc.subjectISM : moleculespt
dc.titleSPH simulations of clumps formation by dissipative collision of molecular clouds - I. Non magnetic caseen
dc.typeArtigo
dcterms.licensehttp://www.afs-journal.org/index.php?option=com_content&view=article&id=100&Itemid=104&lang=en_GB.utf8%2C+en_GB.UT
dcterms.rightsHolderEdp Sciences S A
unesp.author.lattes4276078473559775
unesp.author.orcid0000-0002-7413-0161[1]
unesp.campusUniversidade Estadual Paulista (Unesp), Instituto de Geociências e Ciências Exatas, Rio Claropt

Arquivos

Licença do Pacote
Agora exibindo 1 - 1 de 1
Nenhuma Miniatura disponível
Nome:
license.txt
Tamanho:
1.71 KB
Formato:
Item-specific license agreed upon to submission
Descrição:

Coleções

Artigos - Estatistica, Matemática Aplicada e Computação - IGCE