The Panchromatic Hubble Andromeda Treasury: Triangulum Extended Region (PHATTER). III. The Mass Function of Young Stellar Clusters in M33

PHATTER Collaboration

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13 Scopus citations

Abstract

We measure the star cluster mass function (CMF) for the Local Group galaxy M33. We use the catalog of stellar clusters selected from the Panchromatic Hubble Andromeda Treasury: Triangulum Extended Region survey. We analyze 711 clusters in M33 with 7.0<log(Age/yr)<8.5, and log(M/M) > 3.0 as determined from color-magnitude diagram fits to individual stars. The M33 CMF is best described by a Schechter function with power-law slope α = - 2.06-0.13+0.14, and truncation mass log(M c /M) =4.24-0.13+0.16 . The data show strong evidence for a high-mass truncation, thus strongly favoring a Schechter function fit over a pure power law. M33's truncation mass is consistent with the previously identified linear trend between M c , and star formation rate surface density, ςSFR. We also explore the effect that individual cluster mass uncertainties have on derived mass function parameters, and find evidence to suggest that large cluster mass uncertainties have the potential to bias the truncation mass of fitted mass functions at the 1σ level.

Original languageEnglish (US)
Article number15
JournalAstrophysical Journal
Volume928
Issue number1
DOIs
StatePublished - Mar 1 2022

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

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