On the uncertainties of stellar mass estimates via colour measurements

  1. Get@NRC: On the uncertainties of stellar mass estimates via colour measurements (Opens in a new window)
DOIResolve DOI: http://doi.org/10.1093/mnras/stv1499
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Journal titleMonthly Notices of the Royal Astronomical Society
Pages32093225; # of pages: 17
Subjectgalaxies; galaxy clusters; Virgo galaxy; galaxy formation; galaxy stellar content; fundamental galaxy parameters
AbstractMass-to-light versus colour relations (MLCRs), derived from stellar population synthesis models, are widely used to estimate galaxy stellar masses (M*), yet a detailed investigation of their inherent biases and limitations is still lacking. We quantify several potential sources of uncertainty, using optical and near-infrared (NIR) photometry for a representative sample of nearby galaxies from the Virgo cluster. Our method for combining multiband photometry with MLCRs yields robust stellar masses, while errors in M* decrease as more bands are simultaneously considered. The prior assumptions in one's stellar population modelling dominate the error budget, creating a colour-dependent bias of up to 0.6 dex if NIR fluxes are used (0.3 dex otherwise). This matches the systematic errors associated with the method of spectral energy distribution (SED) fitting, indicating that MLCRs do not suffer from much additional bias. Moreover, MLCRs and SED fitting yield similar degrees of random error (~0.1-0.14 dex) when applied to mock galaxies and, on average, equivalent masses for real galaxies with M* ~ 108-11 M⊙. The use of integrated photometry introduces additional uncertainty in M* measurements, at the level of 0.05-0.07 dex. We argue that using MLCRs, instead of timeconsuming SED fits, is justified in cases with complex model parameter spaces (involving, for instance, multiparameter star formation histories) and/or for large data sets. Spatially resolved methods for measuring M* should be applied for small sample sizes and/or when accuracies less than 0.1 dex are required. An appendix provides our MLCR transformations for 10 colour permutations of the grizH filter set.
Publication date
PublisherOxford University Press
AffiliationNational Research Council Canada; National Science Infrastructure
Peer reviewedYes
NPARC number21277353
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Record identifiere52637d2-ff31-4aeb-8886-a3c62f1d761a
Record created2016-03-09
Record modified2016-05-09
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