S.F. Portegies Zwart
- On the interpretation of the globular cluster luminosity function
- Astrophysical Journal Letters
- Volume | Issue number
- 698 | 2
- Pages (from-to)
- Document type
- Faculty of Science (FNWI)
- Anton Pannekoek Institute for Astronomy (API)
The conversion of the globular cluster luminosity function (GCLF; dN/dlog L) to the globular cluster mass function (GCMF; dN/dlog M) is addressed. Dissolving globular clusters (GCs) become preferentially depleted in low-mass stars which have a high mass-to-light ratio (M/L). This has been shown to result in an M/L that increases with GC luminosity or mass, because more massive GCs have lost a smaller fraction of their stars than low-mass GCs. Using GC models, we study the influence of the luminosity dependency of M/L on the inferred GCMF. The observed GCLF is consistent with a power law or Schechter-type GC initial mass function in combination with a cluster mass-dependent mass-loss rate. Below the peak, the logarithmic slope of the GCMF is shallower than that of the GCLF (0.7 versus 1.0), whereas the peak mass is 0.1-0.3 dex lower when accounting for the variability of M/L than in the case where a constant M/L is adopted.
- go to publisher's site
- DOI: 10.1088/0004-637X/698/2/L158; eprintid: arXiv:0905.3744
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