From the CMF to the IMF: Beyond the core-collapse model
| Autor: | Troels Haugbølle, V. M. Pelkonen, Paolo Padoan, Åke Nordlund |
|---|---|
| Přispěvatelé: | Ministerio de Economía y Competitividad (España), Ministerio de Ciencia e Innovación (España), Independent Research Fund Denmark, University of Copenhagen, Villum Fonden |
| Rok vydání: | 2021 |
| Předmět: |
Initial mass function
Stellar mass MHD Stars: formation INITIAL MASS FUNCTION TURBULENT Theoretical models FOS: Physical sciences Astrophysics Stars: luminosity function Astrophysics::Cosmology and Extragalactic Astrophysics luminosity function mass function [stars] 01 natural sciences STAR-FORMATION DENSE CORES PRESTELLAR CORES mass function [Stars] 0103 physical sciences Astrophysics::Solar and Stellar Astrophysics HYDRODYNAMICAL SIMULATIONS ACCRETION 010303 astronomy & astrophysics Stars: mass function Solar and Stellar Astrophysics (astro-ph.SR) Astrophysics::Galaxy Astrophysics formation [Stars] luminosity function [Stars] Physics 010308 nuclear & particles physics Molecular cloud Astronomy and Astrophysics Astrophysics - Astrophysics of Galaxies CLOUD EVOLUTION Stars STELLAR CLUSTERS Astrophysics - Solar and Stellar Astrophysics Space and Planetary Science Astrophysics of Galaxies (astro-ph.GA) High mass Astrophysics::Earth and Planetary Astrophysics Magnetohydrodynamics Low Mass |
| Zdroj: | Digital.CSIC. Repositorio Institucional del CSIC instname Pelkonen, V-M, Padoan, P, Haugbolle, T & Nordlund, A 2021, ' From the CMF to the IMF : beyond the core-collapse model ', Monthly Notices of the Royal Astronomical Society, vol. 504, no. 1, pp. 1219-1236 . https://doi.org/10.1093/mnras/stab844 |
| ISSN: | 2017-8875 |
| Popis: | Observations have indicated that the pre-stellar core mass function (CMF) is similar to the stellar initial mass function (IMF), except for an offset towards larger masses. This has led to the idea that there is a one-to-one relation between cores and stars, such that the whole stellar mass reservoir is contained in a gravitationally bound pre-stellar core, as postulated by the core-collapse model, and assumed in recent theoretical models of the stellar IMF. We test the validity of this assumption by comparing the final mass of stars with the mass of their progenitor cores in a high-resolution star formation simulation that generates a realistic IMF under physical condition characteristic of observed molecular clouds. Using a definition of bound cores similar to previous works we obtain a CMF that converges with increasing numerical resolution. We find that the CMF and the IMF are closely related in a statistical sense only; for any individual star there is only a weak correlation between the progenitor core mass and the final stellar mass. In particular, for high-mass stars only a small fraction of the final stellar mass comes from the progenitor core, and even for low-mass stars the fraction is highly variable, with a median fraction of only about 50 per cent. We conclude that the core-collapse scenario and related models for the origin of the IMF are incomplete. We also show that competitive accretion is not a viable alternative. We are grateful to the anonymous referee for a detailed and useful report. PP and VMP acknowledge support by the Spanish MINECO under project AYA2017-88754-P, and financial support from the State Agency for Research of the Spanish Ministry of Science and Innovation through the ‘Unit of Excellence María de Maeztu 2020-2023’ award to the Institute of Cosmos Sciences (CEX2019-000918-M). The research leading to these results has received funding from the Independent Research Fund Denmark through grant No. DFF 8021-00350B (TH). We acknowledge PRACE for awarding us access to Curie at GENCI@CEA, France. Storage and computing resources at the University of Copenhagen HPC centre, funded in part by Villum Fonden (VKR023406), were used to carry out part of the data analysis. |
| Databáze: | OpenAIRE |
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