摘要：Aims.Our goal is to characterise the dependence of the optical mass-to-light ratio on galaxy colour up toz= 1.5, expanding the redshift range explored in previous work.Methods.From the redshifts, stellar masses, and rest-frame luminosities of the ALHAMBRA multi-filter survey, we derive the mass-to-light ratio versus colour relation for quiescent and for star-forming galaxies. The intrinsic relation and its physical dispersion are derived with a Bayesian inference model.Results.The rest-framei-band mass-to-light ratio of quiescent and star-forming galaxies presents a tight correlation with the rest-frame (g−i) colour up toz= 1.5. The mass-to-light ratio versus colour relation is linear for quiescent galaxies and quadratic for star-forming galaxies. The intrinsic dispersion in these relations is 0.02 dex for quiescent galaxies and 0.06 dex for star-forming ones. The derived relations do not present a significant redshift evolution and are compatible with previous local results in the literature. Finally, these tight relations also hold forg- andr-band luminosities.Conclusions.The derived mass-to-light ratio versus colour relations in ALHAMBRA can be used to predict the mass-to-light ratio from a rest-frame optical colour up toz= 1.5. These tight correlations do not change with redshift, suggesting that galaxies have evolved along the derived relations during the last 9 Gyr.
关键词：engalaxies: fundamental parametersgalaxies: statisticsgalaxies: stellar content
