Stochastic stellar cluster initial mass functions: models and impact on integrated cluster parameter determination

P. Anders, R. Kotulla, R. De Grijs, J. Wicker

Research output: Contribution to journalArticlepeer-review

18 Citations (Scopus)

Abstract

Stellar clusters are regularly used to study the evolution of their host galaxy. Except for a few nearby galaxies, these studies rely on the interpretation of integrated cluster properties, especially integrated photometry observed using multiple filters (i.e., the spectral energy distribution, SED). To allow interpretation of such observations, we present a large set of GALEV cluster models using the realistic approach of adopting stochastically sampled stellar initial mass functions. We provide models for a wide range of cluster masses (103-2 × 105 M), metallicities (-2.3 ≤ [Fe/H] ≤ +0.18 dex), foreground extinction, and 184 regularly used filters. We analyze various sets of stochastic cluster SEDs by fitting them with non-stochastic models, which is the procedure commonly used in this field. We identify caveats and quantify the fitting uncertainties associated with this standard procedure. We show that this can yield highly unreliable fitting results, especially for low-mass clusters.

Original languageEnglish
Article number138
Number of pages13
JournalAstrophysical Journal
Volume778
Issue number2
DOIs
Publication statusPublished - 1 Dec 2013
Externally publishedYes

Keywords

  • astronomical databases: miscellaneous
  • galaxies: star clusters: general
  • methods: data analysis
  • stars: luminosity function, mass function
  • stars: statistics
  • techniques: photometric

Fingerprint

Dive into the research topics of 'Stochastic stellar cluster initial mass functions: models and impact on integrated cluster parameter determination'. Together they form a unique fingerprint.

Cite this