Baumgardt, H.H.BaumgardtSOLLIMA, ANTONIO LUIGIANTONIO LUIGISOLLIMAHilker, M.M.Hilker2021-11-232021-11-2320201448-6083http://hdl.handle.net/20.500.12386/31124We have used HST and ground-based photometry to determine total $V$-band magnitudes and mass-to-light ratios of more than 150 Galactic globular clusters. We do this by summing up the magnitudes of their individual member stars, using color-magnitude information, Gaia DR2 proper motions and radial velocities to distinguish cluster stars from background stars. Our new magnitudes confirm literature estimates for bright clusters with V<8, but can deviate by up to two magnitudes from literature values for fainter clusters. They lead to absolute mass-to-light ratios that are confined to the narrow range 1.4<M/L_V<2.5, significantly smaller than what was found before. We also find a correlation between a cluster's M/L_V value and its age, in agreement with theoretical predictions. The M/L_V ratios of globular clusters are also in good agreement with those predicted by stellar isochrones, arguing against a significant amount of dark matter inside globular clusters. We finally find that, in agreement with what has been seen in M31, the magnitude distribution of outer halo globular clusters has a tail towards faint clusters that is absent in the inner parts of the Milky Way.STAMPAenArticle10.1017/pasa.2020.382-s2.0-85096179966WOS:000584499100001https://www.cambridge.org/core/journals/publications-of-the-astronomical-society-of-australia/article/absolute-vband-magnitudes-and-masstolight-ratios-of-galactic-globular-clusters/27BC309E353A59CCC879EE7A840FF212http://arxiv.org/abs/2009.09611v12020PASA...37...46BFIS/05 - ASTRONOMIA E ASTROFISICAERC sectors::Physical Sciences and Engineering::PE9 Universe sciences: astro-physics/chemistry/biology; solar systems; stellar, galactic and extragalactic astronomy, planetary systems, cosmology, space science, instrumentation::PE9_6 Stars and stellar systems