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Verfasst von:Parmentier, Geneviève [VerfasserIn]   i
Titel:Molecular clumps disguising their star formation efficiency per free-fall time
Titelzusatz:what we can do not to be fooled
Verf.angabe:Geneviève Parmentier
E-Jahr:2020
Jahr:2020 April 13
Umfang:10 S.
Fussnoten:Gesehen am 07.05.2020
Titel Quelle:Enthalten in: The astrophysical journal / 1
Ort Quelle:London : Institute of Physics Publ., 1996
Jahr Quelle:2020
Band/Heft Quelle:893(2020) Artikel-Nummer 32, 10 Seiten
ISSN Quelle:1538-4357
Abstract:The presence of a volume-density gradient in molecular clumps allows them to raise their star formation rate compared with what they would experience if their gas were uniform in density. This higher value for the star formation rate yields in turn a higher star formation efficiency per free-fall time that we measure. The measured star formation efficiency per free-fall time, , of clumps is therefore plagued by a degeneracy, as two factors contribute to it: one is the density gradient of the clump gas, the other is the intrinsic star formation efficiency per free-fall time, , with which the clump would form stars should there be no gas-density gradient. This paper presents a method allowing one to recover the intrinsic efficiency of a centrally concentrated clump. It hinges on the relation between the surface densities in stars and gas measured locally from clump center to clump edge. Knowledge of the initial density profile of the clump gas is not required. A step-by-step description of the method is provided as a tool in hand for observers. Once has been estimated, it can be compared with its measured, clump-averaged, counterpart, , to quantify the impact that the initial gas-density profile of a clump has had on its star formation history.
DOI:doi:10.3847/1538-4357/ab7928
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/10.3847/1538-4357/ab7928
 DOI: https://doi.org/10.3847/1538-4357/ab7928
Datenträger:Online-Ressource
Sprache:eng
K10plus-PPN:1697674070
Verknüpfungen:→ Zeitschrift

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