Probing the role of the galactic environment in the formation of stellar clusters, using M83 as a test bench

By A. Adamo, D. Kruijssen, N. Bastian, E. Silva-Villa, J. Ryon. 2015

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We present a study of the M83 cluster population, covering the disc of the galaxy between radii of 0.45 and 4.5 kpc. We aim to probe the properties of the cluster population as a function of distance from the galactic centre. We observe a net decline in cluster formation efficiency (Gamma, i.e. amount of star formation happening in bound clusters) from about 26 per cent in the inner region to 8 per cent in the outer part of the galaxy. The recovered Gamma values within different regions of M83 follow the same Gamma versus star formation rate density relation observed for entire galaxies. We also probe the initial cluster mass function (ICMF) as a function of galactocentric distance. We observe a significant steepening of the ICMF in the outer regions (from -1.90 +/- 0.11 to -2.70 +/- 0.14) and for the whole galactic cluster population (slope of -2.18 +/- 0.07) of M83. We show that this change of slope reflects a more fundamental change of the 'truncation mass' at the high-mass end of the distribution. This can be modelled as a Schechter function of slope -2 with an exponential cutoff mass (M-c) that decreases significantly from the inner to the outer regions (from 4.00 to 0.25 x 10(5) M-circle dot) while the galactic M-c is approximate to 1.60 x 10(5) M-circle dot. The trends in Gamma and ICMF are consistent with the observed radial decrease of the Sigma (H-2), hence in gas pressure. As gas pressure declines, cluster formation becomes less efficient. We conclude that the host galaxy environment appears to regulate (1) the fraction of stars locked in clusters and (2) the upper mass limit of the ICMF, consistently described by a near-universal slope -2 truncated at the high-mass end.

Subfields: Astronomy and Astrophysics

View Paper: https://www.semanticscholar.org/paper/f1aa9be717f1947301d6eb588276270d1c53815e

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In Astronomy and Astrophysics

Citations in the corpus

The formation and assembly history of the Milky Way revealed by its globular cluster population (2018, result): “This cluster formation model has been shown to reproduce a wide range of observations (e.g. Adamo et al. 2015; Johnson et al. 2016; Freeman et al. 2017; Ward & Kruijssen 2018; Messa et al. 2018).”
Globular clusters as the relics of regular star formation in ‘normal’ high-redshift galaxies (2015, methodology): “(ii) Only some fraction of all star formation occurs in bound stellar clusters (Lada & Lada 2003), which is referred to as the the cluster formation efficiency (CFE orΓ, Bastian 2008).”