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

Abstract

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. the amount of star formation happening in bound clusters) from about 26 % in the inner region to 8 % 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 $-1.90\pm 0.11$ to $-2.70\pm 0.14$) and for the whole galactic cluster population (slope of $-2.18\pm 0.07$) 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 cut-off mass ($M_{\mathrm{c}}$) that decreases significantly from the inner to the outer regions (from 4.00 to $0.25\times 10^5$ M${}_{\odot }$) while the galactic $M_{\mathrm{c}}$ is $\approx 1.60\times 10^5$ M${}_{\odot }$. The trends in Γand ICMF are consistent with the observed radial decrease of the $\Sigma ({\mathrm{H}}_2)$, 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; 2) the upper mass limit of the ICMF, consistently described by a near-universal slope $-2$ truncated at the high-mass end.

16 pages, revised Table 2 and B1, and Figure 3, 4, and 7, MNRAS in press

References in corpus (14)

• An H-alpha Imaging Survey of Galaxies in the Local 11 Mpc Volume
• The ACS Virgo Cluster Survey. XII. The Luminosity Function of Globular Clusters in Early Type Galaxies
• Legacy ExtraGalactic UV Survey (LEGUS) with The Hubble Space Telescope. I. Survey Description
• The mass function of young star clusters in spiral galaxies
• On the Star Formation Rate - Brightest Cluster Relation: Estimating the peak SFR in post-merger galaxies
• Star Cluster Demographics. I. A General Framework and Application to the Antennae Galaxies
• The distinction between star clusters and associations
• Studying the YMC population of M83: how long clusters remain embedded, their interaction with the ISM and implications for GC formation theories
• Using H-alpha Morphology and Surface Brightness Fluctuations to Age-Date Star Clusters in M83
• The Luminosity Function of Star Clusters in 20 Star-Forming Galaxies Based on Hubble Legacy Archive Photometry
• An Expanded HST/WFC3 Survey of M83: Project Overview and Targeted Supernova Remnant Search
• Star Cluster Mass and Age Distributions of Two Fields in M83 Based on HST/WFC3 Observations
• The Snapshot Hubble U-Band Cluster Survey (SHUCS) II. Star Cluster Population of NGC 2997
• The Star Cluster System in the Local Group Starburst Galaxy IC 10

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