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The Milky Way Bulge Extratidal Star Survey: NGC 6569

We present spectroscopic evidence for tidal debris associated with the bulge globular cluster NGC 6569, based on medium-resolution (R ∼ 11,000) spectra of 303 stars obtained with the Anglo-Australian Telescope. Targets were selected using Blanco DECam Bulge Survey photometry with Gaia DR3 astrometry...

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Detalles Bibliográficos
Autores principales: Hughes, Joanne (Autor) , Kunder, Andrea (Autor) , Covey, Kevin (Autor) , Devine, Kathryn (Autor) , Larson, Kristen A. (Autor) , Campos, Carlos (Autor) , Price-Whelan, Adrian M. (Autor) , McEwen, Joseph E. (Autor) , Perren, Gabriel I. (Autor) , Johnson, Christian I. (Autor) , Horton, Craig (Autor) , Smith, Luke (Autor) , Torset, Sarah (Autor) , Luna, Cynthia (Autor) , Kolmanovsky, Matthew (Autor) , Kovisto, Fiona (Autor) , Villarta, Leander (Autor) , Vuong, Vy (Autor) , Simion, Iulia T. (Autor) , Webster, Kyle (Autor) , Silva, Erika (Autor) , Pilachowski, Catherine A. (Autor) , Rich, R. Michael (Autor) , Kader, Justin A. (Autor) , Koch-Hansen, Andreas (Autor) , Joyce, Meridith (Autor) , McAdam, Sean (Autor) , Benda, Faith (Autor)
Formato: Article (Journal)
Lenguaje:inglés
Publicado: 2026 February 6
In: The astronomical journal
Year: 2026, Volumen: 171, Número: 3, Pages: 1-123
ISSN:1538-3881
DOI:10.3847/1538-3881/ae32f7
Acceso en línea:Verlag, kostenfrei, Volltext: https://doi.org/10.3847/1538-3881/ae32f7
Verlag, kostenfrei, Volltext: https://iopscience.iop.org/article/10.3847/1538-3881/ae32f7
Enlace del recurso
Notas de Autor:Joanne Hughes, Andrea Kunder, Kevin Covey, Kathryn Devine, Kristen A. Larson, Carlos Campos, Adrian M. Price-Whelan, Joseph E. McEwen, Gabriel I. Perren, Christian I. Johnson, Craig Horton, Luke Smith, Sarah Torset, Cynthia Luna, Matthew Kolmanovsky, Fiona Kovisto, Leander Villarta, Vy Vuong, Iulia T. Simion, Kyle Webster, Erika Silva, Catherine A. Pilachowski, R. Michael Rich, Justin A. Kader, Andreas J. Koch-Hansen, Meridith Joyce, Sean McAdam, and Faith Benda
Descripción
Sumario:We present spectroscopic evidence for tidal debris associated with the bulge globular cluster NGC 6569, based on medium-resolution (R ∼ 11,000) spectra of 303 stars obtained with the Anglo-Australian Telescope. Targets were selected using Blanco DECam Bulge Survey photometry with Gaia DR3 astrometry, and span -(i.e., 1-5 rt, where rt is the King-model tidal radius) from the cluster center. Theoretical modeling shows that the Jacobi radii can vary between -and - over the orbit, likely leaving stars around the cluster that are transitioning into the predicted leading and lagging tidal tails. We identify 40 stars in this sample that exhibit chemical and kinematic properties consistent with previous, or borderline, cluster membership. The seven best candidates have S/N > 30, with [Fe/H] = -0.83 ± 0.14 dex and [α/Fe] = +0.38 ± 0.06 dex, consistent with NGC 6569’s bound population. Our findings provide evidence that NGC 6569 is actively losing stars through tidal stripping, contributing to the bulge field population at a present rate of 1.0-1.6 M⊙ Myr−1, which corresponds to ≈5.6% ± 1.3% of its present-day mass per Gyr. This work is part of the Milky Way Bulge Extra-Tidal Star Survey and represents our first detailed study of a massive bulge globular cluster in this context.
Notas:Gesehen am 18.05.2026
Descripción Física:Online Resource
ISSN:1538-3881
DOI:10.3847/1538-3881/ae32f7

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