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How to Form (Twin) Globular Clusters?
Astrophysics · Submitted 11 Jul 2000
abstract compiled · 2026-09-23 · no language-model review
The authors' main claim Taking a galactic tidal field into account shells preferably form twin (or multiple) systems, whereas spheres end up as single clusters.
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The abstract, sentence by sentence
Though it is generally assumed that massive molecular clouds are the progenitors of globular clusters, their detailed formation mechanism is still unclear. Standard scenarios based on the collapse of a smooth matter distribution suffer from strong requirements with respect to cluster formation time scale, binding energy and star formation efficiency. An alternative model assuming cluster formation due to the recollapse of a supernova-induced, fragmented shell can relax these difficulties. In this paper the final collapse stages of the different scenarios are compared by N-body simulations for shells and spheres. It is shown that fragmentation is much more pronounced for shells. Taking a galactic tidal field into account shells preferably form twin (or multiple) systems, whereas spheres end up as single clusters. The twins are characterized by identical metallicities, and stellar mass functions; some of them show counter-rotating cores. Their orbital evolution can result in both, a final merger or well separated twins sharing a common galactic orbit.
background contribution method result interpretation main claim
| # | sentence | role | the authors' own work | states the main conclusion | strength |
|---|---|---|---|---|---|
| s0 | Though it is generally assumed that massive molecular clouds are the progenitors of globular clusters, their detailed formation mechanism is still unclear. | background 0.65 | 0.04 | 0.02 | asserted 0.66 |
| s1 | Standard scenarios based on the collapse of a smooth matter distribution suffer from strong requirements with respect to cluster formation time scale, binding energy and star formation efficiency. | background 0.78 | 0.06 | 0.02 | asserted 1.00 |
| s2 | An alternative model assuming cluster formation due to the recollapse of a supernova-induced, fragmented shell can relax these difficulties. | background 0.80 | 0.09 | 0.07 | hedged possibility 0.65 |
| s3 | In this paper the final collapse stages of the different scenarios are compared by N-body simulations for shells and spheres. | method 0.83 | 0.92 | 0.03 | asserted 0.85 |
| s4 | It is shown that fragmentation is much more pronounced for shells. | result 1.00 | 0.89 | 0.12 | asserted 1.00 |
| s5 | Taking a galactic tidal field into account shells preferably form twin (or multiple) systems, whereas spheres end up as single clusters. | result 1.00 | 0.88 | 0.65 | asserted 0.86 |
| s6 | The twins are characterized by identical metallicities, and stellar mass functions; some of them show counter-rotating cores. | result 1.00 | 0.85 | 0.17 | asserted 0.95 |
| s7 | Their orbital evolution can result in both, a final merger or well separated twins sharing a common galactic orbit. | result 0.90 | 0.82 | 0.15 | hedged possibility 0.84 |
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The paper
Original abstract
Though it is generally assumed that massive molecular clouds are the progenitors of globular clusters, their detailed formation mechanism is still unclear. Standard scenarios based on the collapse of a smooth matter distribution suffer from strong requirements with respect to cluster formation time scale, binding energy and star formation efficiency. An alternative model assuming cluster formation due to the recollapse of a supernova-induced, fragmented shell can relax these difficulties. In this paper the final collapse stages of the different scenarios are compared by N-body simulations for shells and spheres. It is shown that fragmentation is much more pronounced for shells. Taking a galactic tidal field into account shells preferably form twin (or multiple) systems, whereas spheres end up as single clusters. The twins are characterized by identical metallicities, and stellar mass functions; some of them show counter-rotating cores. Their orbital evolution can result in both, a final merger or well separated twins sharing a common galactic orbit.
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