Utilizza questo identificativo per citare o creare un link a questo documento:
http://hdl.handle.net/20.500.12386/31124
Titolo: | Absolute V-band magnitudes and mass-to-light ratios of Galactic globular clusters | Autori: | Baumgardt, H. SOLLIMA, ANTONIO LUIGI Hilker, M. |
Data pubblicazione: | 2020 | Rivista: | PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF AUSTRALIA | Numero: | 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 |
È visualizzato nelle collezioni: | 1.01 Articoli in rivista |
File in questo documento:
File | Descrizione | Dimensioni | Formato | |
---|---|---|---|---|
2009.09611.pdf | preprint | 2.65 MB | Adobe PDF | Visualizza/apri |
PASA.pdf | [Administrators only] | 2.83 MB | Adobe PDF |
Page view(s)
43
controllato il 18-lug-2024
Download(s)
36
controllato il 18-lug-2024
Google ScholarTM
Check
Altmetric
Altmetric
Tutti i documenti in DSpace sono pubblicati ad Accesso Aperto, salvo diversa indicazione per alcuni documenti specifici.