COnnecting LOcal to GLObal star formation via MIni-starburst

Quang, Nguyen Luong Frederique, Motte 1 Hans, Nguyen 2 N. Schneider 3 Fabien, Louvet 4
LAB - Laboratoire d'Astrophysique de Bordeaux [Pessac], UB - Université de Bordeaux, INSU - CNRS - Institut national des sciences de l'Univers , CNRS - Centre National de la Recherche Scientifique
Abstract : To connect local to global star formation, we compare the mass, size, line width, and star formation rate (SFR) density of cloud structures ranging from Galactic clouds ($\sim$1--10~pc in size) to galaxies (with $\sim$1--10~kpc sizes).Our focus is on molecular cloud structures, called massive complexes, which have intermediate sizes of $\sim$100~pc and masses larger than $10^6~\msun$.We propose using a starburstiness quantity $\zeta$ to quantify the star formation intensity of a molecular cloud complex, or how much its SFR deviates from the star formation relations such as Kennicutt and Lada ones. For molecular cloud complex that has $\zeta>3$ , we call it mini-starburst complex, otherwise normal or main-sequence complex. This $\zeta>3$ threshold leads to a SFR threshold. Most complexes can be classified as ministarburst as having $\zeta>3$. We propose that mini-starburst events represent an enhancement of the star formation activity, following dynamic events such as compression, colliding flows, or agglomeration which compress materials within a cloud complex.
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Submitted on : Friday, September 11, 2015 - 4:25:43 PM
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Quang, Nguyen Luong, Frederique, Motte, Hans, Nguyen, N. Schneider, Fabien, Louvet. COnnecting LOcal to GLObal star formation via MIni-starburst. 2015IAUGA.2255299N - IAU General Assembly, Meeting #29, #2255299 - held 4-8 January 2015 in Seattle, USA, Jan 2015, Seattle, United States. pp.55299. ⟨hal-01197434⟩



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