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Verfasst von:Mićić, Milica [VerfasserIn]   i
 Glover, Simon [VerfasserIn]   i
 Banerjee, Robi [VerfasserIn]   i
 Klessen, Ralf S. [VerfasserIn]   i
Titel:Cloud formation in colliding flows
Titelzusatz:influence of the choice of cooling function
Verf.angabe:Milica Micic, Simon C.O. Glover, Robi Banerjee and Ralf S. Klessen
E-Jahr:2013
Jahr:05 April 2013
Umfang:11 S.
Teil:volume:432
 year:2013
 number:1
 pages:626-636
 extent:11
Fussnoten:Gesehen am 21.05.2021
Titel Quelle:Enthalten in: Royal Astronomical SocietyMonthly notices of the Royal Astronomical Society / Letters
Ort Quelle:Oxford : Oxford Univ. Press, 2005
Jahr Quelle:2013
Band/Heft Quelle:432(2013), 1, Seite 626-636
ISSN Quelle:1745-3933
Abstract:We study the influence of the choice of cooling function on the formation of molecular clouds in high-resolution three-dimensional simulations of converging flows. We directly compare the results obtained using the simple, parametrized cooling function introduced by Koyama and Inutsuka and used by a number of converging flow studies with the results of the detailed calculation of the non-equilibrium chemistry and thermal balance of the gas. We find that a number of the cloud properties, such as the mass and volume filling fractions of cold gas, are relatively insensitive to the choice of cooling function. On the other hand, the cloud morphology and the large-scale velocity distribution of the gas do strongly depend on the cooling function. We show that the differences that we see can largely be explained by differences in the way that Lyman α cooling is treated in the two complementary approaches, and that a proper non-equilibrium treatment of the ionization and recombination of the gas is necessary in order to model the high-temperature cooling correctly.We also investigate the properties of the dense clumps formed within the cloud. In agreement with previous models, we find that the majority of these clumps are not self-gravitating, suggesting that some form of large-scale collapse of the cloud may be required in order to produce gravitationally unstable clumps and hence stars. Overall, the physical properties of the dense clumps are similar in both simulations, suggesting that they do not depend strongly on the choice of cooling function. However, we do find a systematic difference of around 10 K in the mean temperatures of the clumps produced by the two models.
DOI:doi:10.1093/mnras/stt489
URL:Bitte beachten Sie: Dies ist ein Bibliographieeintrag. Ein Volltextzugriff für Mitglieder der Universität besteht hier nur, falls für die entsprechende Zeitschrift/den entsprechenden Sammelband ein Abonnement besteht oder es sich um einen OpenAccess-Titel handelt.

Volltext: https://doi.org/10.1093/mnras/stt489
 DOI: https://doi.org/10.1093/mnras/stt489
Datenträger:Online-Ressource
Sprache:eng
K10plus-PPN:1758341637
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