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Verfasst von:Parmentier, Geneviève [VerfasserIn]   i
Titel:The density gradient inside molecular-gas clumps as a booster of their star formation activity
Verf.angabe:G. Parmentier
E-Jahr:2019
Jahr:2019 December 18
Umfang:10 S.
Fussnoten:Gesehen am 10.02.2020
Titel Quelle:Enthalten in: The astrophysical journal / 1
Ort Quelle:London : Institute of Physics Publ., 1996
Jahr Quelle:2019
Band/Heft Quelle:887(2019,2) Artikel-Nummer 179, 10 Seiten
ISSN Quelle:1538-4357
Abstract:Star-forming regions presenting a density gradient experience a higher star formation rate than if they were of uniform density. We refer to the ratio between the star formation rate of a spherical centrally concentrated gas clump and the star formation rate that this clump would experience if it were of uniform density as the magnification factor ζ. We map ζ as a function of clump mass, radius, initial volume-density profile, and star formation timespan. For clumps with a steep density profile (i.e., a power-law slope ranging from −3 to −4, as observed in some high-density regions of Galactic molecular clouds), we find their star formation rate to be at least an order of magnitude higher than their top-hat equivalent. This implies that such clumps experience faster and more efficient star formation than expected based on their mean freefall time. This also implies that measurements of the star formation efficiency per freefall time of clumps based on their global properties, namely, mass, mean volume density, and star formation rate, present wide fluctuations. These reflect the diversity in the density profile of star-forming clumps, not necessarily variations in the physics of star formation. Steep density profiles inside star-cluster progenitors may be instrumental in the formation of multiple stellar populations, such as those routinely observed in old globular clusters.
DOI:doi:10.3847/1538-4357/ab53d6
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/ab53d6
 DOI: https://doi.org/10.3847/1538-4357/ab53d6
Datenträger:Online-Ressource
Sprache:eng
K10plus-PPN:1689672501
Verknüpfungen:→ Zeitschrift

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