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http://hdl.handle.net/20.500.12386/31124
Title: | Absolute V-band magnitudes and mass-to-light ratios of Galactic globular clusters | Authors: | Baumgardt, H. SOLLIMA, ANTONIO LUIGI Hilker, M. |
Issue Date: | 2020 | Journal: | PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF AUSTRALIA | Number: | 37 | Abstract: | We 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. | URI: | http://hdl.handle.net/20.500.12386/31124 | URL: | https://www.cambridge.org/core/journals/publications-of-the-astronomical-society-of-australia/article/absolute-vband-magnitudes-and-masstolight-ratios-of-galactic-globular-clusters/27BC309E353A59CCC879EE7A840FF212 http://arxiv.org/abs/2009.09611v1 |
ISSN: | 1448-6083 | DOI: | 10.1017/pasa.2020.38 | Bibcode ADS: | 2020PASA...37...46B | Fulltext: | open |
Appears in Collections: | 1.01 Articoli in rivista |
Files in This Item:
File | Description | Size | Format | |
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2009.09611.pdf | preprint | 2.65 MB | Adobe PDF | View/Open |
PASA.pdf | [Administrators only] | 2.83 MB | Adobe PDF |
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