A scaling relation for the molecular cloud lifetime in Milky Way-like galaxies
We study the time evolution of molecular clouds across three Milky Way-like isolated disc galaxy simulations at a temporal resolution of 1 Myr and at a range of spatial resolutions spanning two orders of magnitude in spatial scale from similar to 10 pc up to similar to 1 kpc. The cloud evolution net...
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| Hauptverfasser: | , , , , , , |
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| Dokumenttyp: | Article (Journal) |
| Sprache: | Englisch |
| Veröffentlicht: |
7 May 2021
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| In: |
Monthly notices of the Royal Astronomical Society
Year: 2021, Jahrgang: 505, Heft: 2, Pages: 1678-1698 |
| ISSN: | 1365-2966 |
| DOI: | 10.1093/mnras/stab1293 |
| Online-Zugang: | Verlag, lizenzpflichtig, Volltext: https://doi.org/10.1093/mnras/stab1293 Verlag, lizenzpflichtig, Volltext: https://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcAuth=DynamicDOIArticle&SrcApp=WOS&KeyAID=10.1093%2Fmnras%2Fstab1293&DestApp=DOI&SrcAppSID=F4YMMc9jPB5f9dX7ixC&SrcJTitle=MONTHLY+NOTICES+OF+THE+ROYAL+ASTRONOMICAL+SOCIETY&DestDOIRegistrantName=Oxford+University+Press 
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| Verfasserangaben: | Sarah M.R. Jeffreson, Benjamin W. Keller, Andrew J. Winter, Mélanie Chevance, J.M. Diederik Kruijssen, Mark R. Krumholz and Yusuke Fujimoto |
MARC
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| 245 | 1 | 2 | |a A scaling relation for the molecular cloud lifetime in Milky Way-like galaxies |c Sarah M.R. Jeffreson, Benjamin W. Keller, Andrew J. Winter, Mélanie Chevance, J.M. Diederik Kruijssen, Mark R. Krumholz and Yusuke Fujimoto |
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| 520 | |a We study the time evolution of molecular clouds across three Milky Way-like isolated disc galaxy simulations at a temporal resolution of 1 Myr and at a range of spatial resolutions spanning two orders of magnitude in spatial scale from similar to 10 pc up to similar to 1 kpc. The cloud evolution networks generated at the highest spatial resolution contain a cumulative total of similar to 80000 separate molecular clouds in different galactic-dynamical environments. We find that clouds undergo mergers at a rate proportional to the crossing time between their centroids, but that their physical properties are largely insensitive to these interactions. Below the gas-disc scale height, the cloud lifetime tau(life) obeys a scaling relation of the form tau(life)proportional to l(-0.3) with the cloud size l, consistent with over-densities that collapse, form stars, and are dispersed by stellar feedback. Above the disc scale height, these self-gravitating regions are no longer resolved, so the scaling relation flattens to a constant value of similar to 13 Myr, consistent with the turbulent crossing time of the gas disc, as observed in nearby disc galaxies. | ||
| 650 | 4 | |a density-fluctuations | |
| 650 | 4 | |a evolutionary sequences | |
| 650 | 4 | |a formation cycle | |
| 650 | 4 | |a formation efficiency | |
| 650 | 4 | |a galactic distribution | |
| 650 | 4 | |a galaxies: evolution | |
| 650 | 4 | |a galaxies: ISM | |
| 650 | 4 | |a hierarchical star-formation | |
| 650 | 4 | |a interstellar-medium | |
| 650 | 4 | |a ISM: clouds | |
| 650 | 4 | |a ISM: evolution | |
| 650 | 4 | |a ISM: kinematics and dynamics | |
| 650 | 4 | |a nearby galaxies | |
| 650 | 4 | |a radiative opacities | |
| 650 | 4 | |a stars: formation | |
| 650 | 4 | |a uncertainty principle | |
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| 700 | 1 | |a Winter, Andrew J. |e VerfasserIn |0 (DE-588)1205322086 |0 (DE-627)1690904445 |4 aut | |
| 700 | 1 | |a Chevance, Mélanie |e VerfasserIn |0 (DE-588)1141805553 |0 (DE-627)1000759342 |0 (DE-576)470814411 |4 aut | |
| 700 | 1 | |a Kruijssen, Diederik |e VerfasserIn |0 (DE-588)1097786889 |0 (DE-627)857371215 |0 (DE-576)468950656 |4 aut | |
| 700 | 1 | |a Krumholz, Mark R. |e VerfasserIn |4 aut | |
| 700 | 1 | |a Fujimoto, Yusuke |e VerfasserIn |4 aut | |
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