Spectra of globular clusters in the Sombrero galaxy: evidence for spectroscopic metallicity bimodality

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dc.contributor.authorAlves-Brito, Alan
dc.contributor.authorHau, George K. T.
dc.contributor.authorForbes, Duncan A.
dc.contributor.authorSpitler, Lee R.
dc.contributor.authorStrader, Jay
dc.contributor.authorBrodie, Jean P.
dc.contributor.authorRhode, Katherine L.
dc.date.accessioned2025-01-20T23:59:58Z
dc.date.available2025-01-20T23:59:58Z
dc.date.issued2011
dc.description.abstractWe present a large sample of over 200 integrated-light spectra of confirmed globular clusters (GCs) associated with the Sombrero (M104) galaxy taken with the Deep Imaging Multi-Object Spectrograph (DEIMOS) instrument on the Keck telescope. A significant fraction of the spectra have signal-to-noise ratio levels high enough to allow measurements of GC metallicities using the method of Brodie & Huchra. We find a distribution of spectroscopic metallicities in the range -2.2 < [Fe/H] < + 0.1 that is bimodal, with peaks at [Fe/H] similar to -1.4 and -0.6. Thus, the GC system of the Sombrero galaxy, like a few other galaxies now studied in detail, reveals a bimodal spectroscopic metallicity distribution supporting the long-held belief that colour bimodality reflects two metallicity subpopulations. This further suggests that the transformation from optical colour to metallicity for old stellar populations, such as GCs, is not strongly non-linear. We also explore the radial and magnitude distribution with metallicity for GC subpopulations but small number statistics prevent any clear trends in these distributions.
dc.fuente.origenWOS
dc.identifier.doi10.1111/j.1365-2966.2011.19368.x
dc.identifier.eissn1365-2966
dc.identifier.issn0035-8711
dc.identifier.urihttps://doi.org/10.1111/j.1365-2966.2011.19368.x
dc.identifier.urihttps://repositorio.uc.cl/handle/11534/95318
dc.identifier.wosidWOS:000297043600014
dc.issue.numero3
dc.language.isoen
dc.pagina.final1838
dc.pagina.inicio1823
dc.revistaMonthly notices of the royal astronomical society
dc.rightsacceso restringido
dc.subjectglobular clusters: general
dc.subjectgalaxies: individual: Sombrero (M104, NGC 4594)
dc.subjectgalaxies: star clusters: general
dc.titleSpectra of globular clusters in the Sombrero galaxy: evidence for spectroscopic metallicity bimodality
dc.typeartículo
dc.volumen417
sipa.indexWOS
sipa.trazabilidadWOS;2025-01-12
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