Abstract
The aim of this paper is to present a set of numerical simulations of a penetrating collision, in which a small gas core (the bullet) penetrates a larger gas core (the target). In the target core, the gravitational collapse is supposed to be ongoing before the collision. Each colliding core has a uniform density profile and rigid body rotation; besides the mass and size of the target core have been chosen to represent the observed molecular cloud core L1544. We modified the Lagrangian code \(\textit{Gagdet}2\) to identify when a gas particle can become an accretion center, and to inherit the mass and momentum of all the very close neighboring particles. Three collision models are here considered for pre-collision velocities \(v/c_0=\) \(2.5\), \(5.0\), and \(10\) Mach. The outcome of these collision models are presented only for two different values of the bullet’s radius, that is for \(R_0/4\), and \(R_0/2\) where \(R_0\) is the radius of the target core. Such collision models reveal how accretion centers are formed, with a spatial distribution that strongly depends on the pre-collision velocity. We thus show hereby that penetrating collisions may have a major and favorable influence in the star formation process.
Access this chapter
Tax calculation will be finalised at checkout
Purchases are for personal use only
References
Anathpindika S (2009) Supersonic cloud collision. Astron Astrophys 504:437–450
Anathpindika S (2010) Collision between dissimilar clouds: stability of the bow-shock, and the formation of prestellar cores. Mon Not Roy Astron Soc 405:1431–1443
Arreaga-Garcia G, Klapp J, Saucedo-Morales J (2014) Simulations of colliding uniform density H2 clouds. Int J Astron Astrophys 4:192–220
Balsara DS (1995) von Neumann stability analysis of smooth particle hydrodynamics: suggestions for optimal algorithms. J Comput Phys 121:357–372
Boss AP, Fisher RT, Klein R, McKee CF (2000) The Jeans condition and collapsing molecular cloud cores: filament or binaries? Astrophys J 528:325–335
Higuchi AE, Chibueze-Asao JO, Tasker EJ, Ken-Takahira K, Takano S (2014) ALMA view of GO.25+0.016: can cloud-cloud collision form the cloud? Astrophys J 147(6):7
Monaghan JJ, Gingold RA (1983) On the fragmentation of differentially rotating clouds. Mon Not Roy Astron Soc 204:715–733
Springel V (2005) The cosmological simulation code Gadget-2. Mon Not Roy Astron Soc 364:1105–1134
Whitworth AP, Ward-Thompson D (2001) An empirical model for protostellar collapse. Astrophys J 547:317–322
Acknowledgments
We would like to thank ACARUS-UNISON for the use of their computing facilities. This work has been partially supported by the Consejo Nacional de Ciencia y Tecnología of Mexico (CONACyT) under the project CONACyT-EDOMEX-2011-C01-165873.
Author information
Authors and Affiliations
Corresponding author
Editor information
Editors and Affiliations
Rights and permissions
Copyright information
© 2015 Springer International Publishing Switzerland
About this paper
Cite this paper
Arreaga-García, G., Klapp, J. (2015). Accretion Centers Induced in a Molecular Cloud Core After a Penetrating Collision. In: Klapp, J., Ruíz Chavarría, G., Medina Ovando, A., López Villa, A., Sigalotti, L. (eds) Selected Topics of Computational and Experimental Fluid Mechanics. Environmental Science and Engineering(). Springer, Cham. https://doi.org/10.1007/978-3-319-11487-3_41
Download citation
DOI: https://doi.org/10.1007/978-3-319-11487-3_41
Published:
Publisher Name: Springer, Cham
Print ISBN: 978-3-319-11486-6
Online ISBN: 978-3-319-11487-3
eBook Packages: Earth and Environmental ScienceEarth and Environmental Science (R0)