Flow‐driven cloud formation and fragmentation: results from Eulerian and Lagrangian simulations
dc.contributor.author | Heitsch, Fabian | en_US |
dc.contributor.author | Naab, Thorsten | en_US |
dc.contributor.author | Walch, Stefanie | en_US |
dc.date.accessioned | 2011-11-10T15:34:28Z | |
dc.date.available | 2012-09-04T15:27:36Z | en_US |
dc.date.issued | 2011-07-21 | en_US |
dc.identifier.citation | Heitsch, Fabian; Naab, Thorsten; Walch, Stefanie (2011). "Flow‐driven cloud formation and fragmentation: results from Eulerian and Lagrangian simulations." Monthly Notices of the Royal Astronomical Society 415(1). <http://hdl.handle.net/2027.42/86944> | en_US |
dc.identifier.issn | 0035-8711 | en_US |
dc.identifier.issn | 1365-2966 | en_US |
dc.identifier.uri | https://hdl.handle.net/2027.42/86944 | |
dc.description.abstract | The fragmentation of shocked flows in a thermally bistable medium provides a natural mechanism to form turbulent cold clouds as precursors to molecular clouds. Yet because of the large density and temperature differences and the range of dynamical scales involved, following this process with numerical simulations is challenging. We compare two‐dimensional simulations of flow‐driven cloud formation without self‐gravity, using the Lagrangian smoothed particle hydrodynamics (SPH) code vine and the Eulerian grid code proteus . Results are qualitatively similar for both methods, yet the variable spatial resolution of the SPH method leads to smaller fragments and thinner filaments, rendering the overall morphologies different. Thermal and hydrodynamical instabilities lead to rapid cooling and fragmentation into cold clumps with temperatures below 300 K. For clumps more massive than 1 M ⊙ pc −1 , the clump mass function has an average slope of −0.8. The internal velocity dispersion of the clumps is nearly an order of magnitude smaller than their relative motion, rendering it subsonic with respect to the internal sound speed of the clumps but supersonic as seen by an external observer. For the SPH simulations most of the cold gas resides at temperatures below 100 K, while the grid‐based models show an additional, substantial component between 100 and 300 K. Independent of the numerical method, our models confirm that converging flows of warm neutral gas fragment rapidly and form high‐density, low‐temperature clumps as possible seeds for star formation. | en_US |
dc.publisher | Blackwell Publishing Ltd | en_US |
dc.publisher | Wiley Periodicals, Inc. | en_US |
dc.subject.other | Hydrodynamics | en_US |
dc.subject.other | Instabilities | en_US |
dc.subject.other | Methods: Numerical | en_US |
dc.subject.other | Stars: Formation | en_US |
dc.subject.other | ISM: Clouds | en_US |
dc.subject.other | ISM: Kinematics and Dynamics | en_US |
dc.title | Flow‐driven cloud formation and fragmentation: results from Eulerian and Lagrangian simulations | en_US |
dc.type | Article | en_US |
dc.rights.robots | IndexNoFollow | en_US |
dc.subject.hlbsecondlevel | Astronomy | en_US |
dc.subject.hlbtoplevel | Science | en_US |
dc.description.peerreviewed | Peer Reviewed | en_US |
dc.contributor.affiliationum | Department of Astronomy, University of Michigan, 500 Church St, Ann Arbor, MI 48109‐1042, USA | en_US |
dc.contributor.affiliationother | Department of Physics and Astronomy, UNC Chapel Hill, 120 E Cameron St, Chapel Hill, NC 27599‐3255, USA | en_US |
dc.contributor.affiliationother | Universitäts Sternwarte München, Scheinerstr. 1, D‐81679 München, Germany | en_US |
dc.contributor.affiliationother | Max Planck Institut für Astrophysik, Karl‐Schwarzschild‐Str. 1, 85741 Garching, Germany | en_US |
dc.contributor.affiliationother | School of Physics and Astronomy, Cardiff University, 5 The Parade, Cardiff CF24 3AA | en_US |
dc.description.bitstreamurl | http://deepblue.lib.umich.edu/bitstream/2027.42/86944/1/j.1365-2966.2011.18694.x.pdf | |
dc.identifier.doi | 10.1111/j.1365-2966.2011.18694.x | en_US |
dc.identifier.source | Monthly Notices of the Royal Astronomical Society | en_US |
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