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A deep view into the nucleus of the Sagittarius dwarf spheroidal galaxy: M54

Published online by Cambridge University Press:  11 March 2020

M. Alfaro-Cuello Open the ORCID record for M. Alfaro-Cuello [Opens in a new window] ,
N. Kacharov ,
N. Neumayer ,
A. Mastrobuono-Battisti Open the ORCID record for A. Mastrobuono-Battisti [Opens in a new window] ,
N. Lützgendorf ,
Anil C. Seth Open the ORCID record for Anil C. Seth [Opens in a new window] ,
T. Böker ,
S. Kamann Open the ORCID record for S. Kamann [Opens in a new window] ,
R. Leaman  and
G. van de Ven Open the ORCID record for G. van de Ven [Opens in a new window]
...Show all authors
M. Alfaro-Cuello
Affiliation:
Max-Planck-Institut für Astronomie, Königstuhl 17, 69117 Heidelberg, Germany
N. Kacharov
Affiliation:
Max-Planck-Institut für Astronomie, Königstuhl 17, 69117 Heidelberg, Germany
N. Neumayer
Affiliation:
Max-Planck-Institut für Astronomie, Königstuhl 17, 69117 Heidelberg, Germany
A. Mastrobuono-Battisti
Affiliation:
Max-Planck-Institut für Astronomie, Königstuhl 17, 69117 Heidelberg, Germany
N. Lützgendorf
Affiliation:
European Space Agency, c/o STScI, 3700 San Martin Drive, Baltimore, MD21218, USA
Anil C. Seth
Affiliation:
University of Utah, Salt Lake City, UT84112, USA
T. Böker
Affiliation:
European Space Agency, c/o STScI, 3700 San Martin Drive, Baltimore, MD21218, USA
S. Kamann
Affiliation:
Liverpool John Moores University, 146 Brownlow Hill, Liverpool L3 5RF, United Kingdom
R. Leaman
Affiliation:
Max-Planck-Institut für Astronomie, Königstuhl 17, 69117 Heidelberg, Germany
G. van de Ven
Affiliation:
University of Vienna, Türkenschanzstrasse 17, 1180 Wien, Austria
P. Bianchini
Affiliation:
Observatoire Astronomique de Strasbourg, CNRS, UMR 7550, F-67000 Strasbourg, France
L. L. Watkins
Affiliation:
University of Vienna, Türkenschanzstrasse 17, 1180 Wien, Austria European Southern Observatory, Karl-Schwarzschild-Str. 2, 85748 Garching, Germany email: [email protected]
M. Lyubenova
Affiliation:
European Southern Observatory, Karl-Schwarzschild-Str. 2, 85748 Garching, Germany email: [email protected]
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Abstract

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Nuclear star clusters hosted by dwarf galaxies exhibit similar characteristics to high-mass, metal complex globular clusters. This type of globular clusters could, therefore, be former nuclei from accreted galaxies. M54 resides in the photometric center of the Sagittarius dwarf galaxy, at a distance where resolving stars is possible. M54 offers the opportunity to study a nucleus before the stripping of their host by the tidal field effects of the Milky Way. We use a MUSE data set to perform a detailed analysis of over 6600 stars. We characterize the stars by metallicity, age, and kinematics, identifying the presence of three stellar populations: a young metal-rich (YMR), an intermediate-age metal-rich (IMR), and an old metal-poor (OMP). The evidence suggests that the OMP population is the result of accretion of globular clusters in the center of the host, while the YMR population was born in-situ in the center of the OMP population.

Keywords

M56 (NGC 6751)
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 14 , Symposium S351: Star Clusters: From the Milky Way to the Early Universe , May 2019 , pp. 47 - 50
Copyright
© International Astronomical Union 2020

References

Alfaro-Cuello, et al. 2019, ApJ, 886, 57CrossRefGoogle Scholar
Bekki, K. & Freeman, K. C. 2003, MNRAS, 346, L11CrossRefGoogle Scholar
Bellazzini, M., Ibata, R. A., Chapman, S. C., et al. 2008, AJ, 136, 1147CrossRefGoogle Scholar
Böker, T. 2008, ApJL, 672, L111CrossRefGoogle Scholar
Carretta, E., Bragaglia, A., Gratton, R. G., et al. 2010a, A&A, 520, A95Google Scholar
Carretta, E., Bragaglia, A., Gratton, R. G., et al. 2010b, ApJL, 714, L7CrossRefGoogle Scholar
Cordero, M. J., Hénault-Brunet, V., Pilachowski, C. A., Balbinot, E., Johnson, C. I., & Varri, A. L. 2017, MNRAS, 465, 3515CrossRefGoogle Scholar
Georgiev, I. Y., Neumayer, N., Lützgendorf, N., Böker, T., & Leigh, N. 2016, MNRAS, 457, 2122CrossRefGoogle Scholar
Harris, W. E. 1996, VizieR Online Data Catalog, 7195Google Scholar
Ibata, R., Bellazzini, M., Chapman, S. C., Dalessandro, E., Fer, et al. 2009, ApJ, 699, L169CrossRefGoogle Scholar
Koch, A., Hanke, M., & Kacharov, N. 2018, A&A, 616, A74Google Scholar
Monaco, L., Bellazzini, M., Bonifacio, P., Ferraro, F. R., Marconi, G., et al. 2005a, A&A, 441, 141Google Scholar
Monaco, L., Bellazzini, M., Ferraro, F. R., & Pancino, E. 2005b, MNRAS, 356, 1396CrossRefGoogle Scholar
Mucciarelli, A., Bellazzini, M., Ibata, R., et al. 2017, A&A, 605, A46Google Scholar
Sollima, A., Cacciari, C., Bellazzini, M., & Colucci, S. 2010, MNRAS, 406, 329CrossRefGoogle Scholar
Siegel, M. H., Dotter, A., Majewski, S. R., et al. 2007, ApJL, 667, L57CrossRefGoogle Scholar
Zhu, L., van de Ven, G., Watkins, L. L., & Posti, L. 2016a, MNRAS, 463, 1117CrossRefGoogle Scholar
Zhu, L., Romanowsky, A. J., van de Ven, G., et al. 2016b, MNRAS, 462, 4001CrossRefGoogle Scholar