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| Verfasst von: | Chevance, Mélanie [VerfasserIn]  |
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| | Kruijssen, Diederik [VerfasserIn] |
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| | Hygate, Alexander P. S. [VerfasserIn] |
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| | Schruba, Andreas [VerfasserIn] |
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| | Longmore, Steven N [VerfasserIn] |
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| | Groves, Brent [VerfasserIn] |
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| | Henshaw, Jonathan D. [VerfasserIn] |
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| | Herrera, Cinthya N [VerfasserIn] |
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| | Hughes, Annie [VerfasserIn] |
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| | Jeffreson, Sarah [VerfasserIn] |
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| | Lang, Philipp [VerfasserIn] |
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| | Leroy, Adam K [VerfasserIn] |
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| | Meidt, Sharon E. [VerfasserIn] |
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| | Pety, Jérôme [VerfasserIn] |
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| | Razza, Alessandro [VerfasserIn] |
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| | Rosolowsky, Erik [VerfasserIn] |
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| | Schinnerer, Eva [VerfasserIn] |
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| | Bigiel, Frank [VerfasserIn] |
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| | Blanc, Guillermo A [VerfasserIn] |
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| | Emsellem, Eric [VerfasserIn] |
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| | Faesi, Christopher M [VerfasserIn] |
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| | Glover, Simon [VerfasserIn] |
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| | Haydon, Daniel T. [VerfasserIn] |
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| | Ho, I-Ting [VerfasserIn] |
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| | Kreckel, Kathryn [VerfasserIn] |
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| | Lee, Janice C [VerfasserIn] |
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| | Liu, Daizhong [VerfasserIn] |
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| | Querejeta, Miguel [VerfasserIn] |
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| | Saito, Toshiki [VerfasserIn] |
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| | Sun, Jiayi [VerfasserIn] |
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| | Usero, Antonio [VerfasserIn] |
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| | Utomo, Dyas [VerfasserIn] |
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| Titel: | The lifecycle of molecular clouds in nearby star-forming disc galaxies |
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| Verf.angabe: | Mélanie Chevance, JM Diederik Kruijssen, Alexander PS Hygate, Andreas Schruba, Steven N Longmore, Brent Groves, Jonathan D Henshaw, Cinthya N Herrera, Annie Hughes, Sarah MR Jeffreson, Philipp Lang, Adam K Leroy, Sharon E Meidt, Jérôme Pety, Alessandro Razza, Erik Rosolowsky, Eva Schinnerer, Frank Bigiel, Guillermo A Blanc, Eric Emsellem, Christopher M Faesi, Simon CO Glover, Daniel T Haydon, I-Ting Ho, Kathryn Kreckel, Janice C Lee, Daizhong Liu, Miguel Querejeta, Toshiki Saito, Jiayi Sun, Antonio Usero and Dyas Utomo |
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| Jahr: | 2020 |
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| Umfang: | 38 S. |
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| Fussnoten: | Advance access publication 2019 December 19 ; Gesehen am 15.04.2021 |
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| Titel Quelle: | Enthalten in: Royal Astronomical SocietyMonthly notices of the Royal Astronomical Society |
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| Ort Quelle: | Oxford : Oxford Univ. Press, 1827 |
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| Jahr Quelle: | 2020 |
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| Band/Heft Quelle: | 493(2020), 2 vom: Apr., Seite 2872-2909 |
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| ISSN Quelle: | 1365-2966 |
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| Abstract: | It remains a major challenge to derive a theory of cloud-scale (≲100 pc) star formation and feedback, describing how galaxies convert gas into stars as a function of the galactic environment. Progress has been hampered by a lack of robust empirical constraints on the giant molecular cloud (GMC) lifecycle. We address this problem by systematically applying a new statistical method for measuring the evolutionary timeline of the GMC lifecycle, star formation, and feedback to a sample of nine nearby disc galaxies, observed as part of the PHANGS-ALMA survey. We measure the spatially resolved (∼100 pc) CO-to-H α flux ratio and find a universal de-correlation between molecular gas and young stars on GMC scales, allowing us to quantify the underlying evolutionary timeline. GMC lifetimes are short, typically $10\!-\!30\,{\rm Myr}$, and exhibit environmental variation, between and within galaxies. At kpc-scale molecular gas surface densities ΣH2≥8M⊙pc−2, the GMC lifetime correlates with time-scales for galactic dynamical processes, whereas at ΣH2≤8M⊙pc−2 GMCs decouple from galactic dynamics and live for an internal dynamical time-scale. After a long inert phase without massive star formation traced by H α (75-90 per cent of the cloud lifetime), GMCs disperse within just 1-5 Myr once massive stars emerge. The dispersal is most likely due to early stellar feedback, causing GMCs to achieve integrated star formation efficiencies of 4-10 per cent. These results show that galactic star formation is governed by cloud-scale, environmentally dependent, dynamical processes driving rapid evolutionary cycling. GMCs and H ii regions are the fundamental units undergoing these lifecycles, with mean separations of 100−300 pc in star-forming discs. Future work should characterize the multiscale physics and mass flows driving these lifecycles. |
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| DOI: | doi:10.1093/mnras/stz3525 |
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| 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/stz3525 |
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| | DOI: https://doi.org/10.1093/mnras/stz3525 |
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| Datenträger: | Online-Ressource |
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| Sprache: | eng |
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| K10plus-PPN: | 1754996086 |
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| Verknüpfungen: | → Zeitschrift |
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¬The¬ lifecycle of molecular clouds in nearby star-forming disc galaxies / Chevance, Mélanie [VerfasserIn]; 2020 (Online-Ressource)
