The Milky Way Bulge Extra-Tidal Star Survey: NGC 6569
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arXiv
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| Autores principales: | , , , , , , , , , , , , , , , , , , , , , , , , , , , |
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| Formato: | Preprint |
| Publicado: |
2025
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| author | Hughes, Joanne Kunder, Andrea Covey, Kevin Devine, Kathryn Larson, Kristen A. Campos, Carlos Price-Whelan, Adrian M. McEwen, Joseph E. Perren, Gabriel I. Johnson, Christian I. Horton, Craig Smith, Luke Torset, Sarah Luna, Cynthia Kolmanovsky, Matthew Kovisto, Fiona Villarta, Leander Vuong, Vy Simion, Iulia T. Webster, Kyle Silva, Erika Pilachowski, Catherine A. Rich, R. Michael Kader, Justin A. Koch-Hansen, Andreas J. Joyce, Meridith McAdam, Sean Benda, Faith |
| author_facet | Hughes, Joanne Kunder, Andrea Covey, Kevin Devine, Kathryn Larson, Kristen A. Campos, Carlos Price-Whelan, Adrian M. McEwen, Joseph E. Perren, Gabriel I. Johnson, Christian I. Horton, Craig Smith, Luke Torset, Sarah Luna, Cynthia Kolmanovsky, Matthew Kovisto, Fiona Villarta, Leander Vuong, Vy Simion, Iulia T. Webster, Kyle Silva, Erika Pilachowski, Catherine A. Rich, R. Michael Kader, Justin A. Koch-Hansen, Andreas J. Joyce, Meridith McAdam, Sean Benda, Faith |
| contents | We present spectroscopic evidence for tidal debris associated with the bulge globular cluster NGC 6569, based on medium-resolution (R ~ 11,000) Anglo-Australian Telescope spectra of 303 stars. Targets were selected using Blanco DECam Bulge Survey (BDBS) photometry and Gaia DR3 astrometry, spanning 7-30 arcmin (~1-5 rt, where rt is the King-model tidal radius) from the cluster center. Orbit-based modeling predicts a strongly time-variable Jacobi radius, with rJ ~ 8-11 arcmin near pericenter and ~18-22 arcmin near apocenter, so stars just outside rt can be unbound and feeding leading and lagging tidal tails. We identify 40 stars with kinematics and abundances consistent with previous, or borderline, cluster membership. The seven highest-quality candidates (S/N > 30) have mean [Fe/H] = -0.83 +/- 0.14 and [alpha/Fe] = +0.38 +/- 0.06 dex, matching the bound population. Interpreting these stars as recently stripped debris implies a present-day mass-loss rate of 1.0-1.6 solar masses per Myr, or 5.6 +/- 1.3% of the current cluster mass per Gyr. These results indicate ongoing tidal stripping of NGC 6569 and quantify its contribution to the bulge field. This paper is part of the Milky Way Bulge Extra-Tidal Star Survey (MWBest) and is our first detailed debris study of a massive bulge globular cluster. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2512_19074 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | The Milky Way Bulge Extra-Tidal Star Survey: NGC 6569 Hughes, Joanne Kunder, Andrea Covey, Kevin Devine, Kathryn Larson, Kristen A. Campos, Carlos Price-Whelan, Adrian M. McEwen, Joseph E. Perren, Gabriel I. Johnson, Christian I. Horton, Craig Smith, Luke Torset, Sarah Luna, Cynthia Kolmanovsky, Matthew Kovisto, Fiona Villarta, Leander Vuong, Vy Simion, Iulia T. Webster, Kyle Silva, Erika Pilachowski, Catherine A. Rich, R. Michael Kader, Justin A. Koch-Hansen, Andreas J. Joyce, Meridith McAdam, Sean Benda, Faith Astrophysics of Galaxies We present spectroscopic evidence for tidal debris associated with the bulge globular cluster NGC 6569, based on medium-resolution (R ~ 11,000) Anglo-Australian Telescope spectra of 303 stars. Targets were selected using Blanco DECam Bulge Survey (BDBS) photometry and Gaia DR3 astrometry, spanning 7-30 arcmin (~1-5 rt, where rt is the King-model tidal radius) from the cluster center. Orbit-based modeling predicts a strongly time-variable Jacobi radius, with rJ ~ 8-11 arcmin near pericenter and ~18-22 arcmin near apocenter, so stars just outside rt can be unbound and feeding leading and lagging tidal tails. We identify 40 stars with kinematics and abundances consistent with previous, or borderline, cluster membership. The seven highest-quality candidates (S/N > 30) have mean [Fe/H] = -0.83 +/- 0.14 and [alpha/Fe] = +0.38 +/- 0.06 dex, matching the bound population. Interpreting these stars as recently stripped debris implies a present-day mass-loss rate of 1.0-1.6 solar masses per Myr, or 5.6 +/- 1.3% of the current cluster mass per Gyr. These results indicate ongoing tidal stripping of NGC 6569 and quantify its contribution to the bulge field. This paper is part of the Milky Way Bulge Extra-Tidal Star Survey (MWBest) and is our first detailed debris study of a massive bulge globular cluster. |
| title | The Milky Way Bulge Extra-Tidal Star Survey: NGC 6569 |
| topic | Astrophysics of Galaxies |
| url | https://arxiv.org/abs/2512.19074 |