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The NGC 7742 star cluster luminosity function: a population analysis revisited

Richard de Grijs, Chao Ma


Abstract We re-examine the properties of the star cluster population in the circumnuclear starburst ring in the face-on spiral galaxy NGC 7742, whose young cluster mass function has been reported to exhibit significant deviations from the canonical power law. We base our reassessment on the clusters’ luminosities (an observational quantity) rather than their masses (a derived quantity), and confirm conclusively that the galaxy’s starburst-ring clusters—and particularly the youngest subsample, log(t yr −1) ≤ 7.2—show evidence of a turnover in the cluster luminosity function well above the 90% completeness limit adopted to ensure the reliability of our results. This confirmation emphasizes the unique conundrum posed by this unusual cluster population.


Keywords globular clusters: general — galaxies: evolution — galaxies: individual (NGC 7742) — galaxies: star clusters: general — galaxies: star formation

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