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The pristine dwarf-...
The pristine dwarf-galaxy survey - III. Revealing the nature of the Milky Way globular cluster Sagittarius II
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Longeard, Nicolas (author)
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Martin, Nicolas (author)
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Ibata, Rodrigo A. (author)
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Starkenburg, Else (author)
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Jablonka, Pascale (author)
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Aguado, David S. (author)
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Carlberg, Raymond G. (author)
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Côté, Patrick (author)
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González Hernández, Jonay (author)
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Lucchesi, Romain (author)
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- Malhan, Khyati (author)
- Stockholms universitet,Fysikum,Oskar Klein-centrum för kosmopartikelfysik (OKC)
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Navarro, Julio F. (author)
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Sanchez-Janssen, Ruben (author)
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Thomas, Guillaume F. (author)
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- Venn, Kim (author)
- Stockholms universitet,Fysikum,Oskar Klein-centrum för kosmopartikelfysik (OKC)
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McConnachie, Alan W. (author)
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(creator_code:org_t)
- 2021-03-05
- 2021
- English.
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In: Monthly notices of the Royal Astronomical Society. - : Oxford University Press (OUP). - 0035-8711 .- 1365-2966. ; 503:2, s. 2754-2762
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https://arxiv.org/ab...
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http://arxiv.org/pdf...
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https://urn.kb.se/re...
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Abstract
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- We present a new spectroscopic study of the faint Milky Way satellite Sagittarius II. Using multiobject spectroscopy from the Fibre Large Array Multi-Element Spectrograph, we supplement the data set of Longeard et al. with 47 newly observed stars, 19 of which are identified as members of the satellite. These additional member stars are used to put tighter constraints on the dynamics and the metallicity properties of the system. We find a low velocity dispersion of sigma(SgrII)(v) = 1.7 +/- 0.5 km s(-1), in agreement with the dispersion of Milky Way globular clusters of similar luminosity. We confirm the very metal-poor nature of the satellite ([Fe/H](spectro)(SgrII) = -2.23 +/- 0.07) and find that the metallicity dispersion of Sgr II is not resolved, reaching only 0.20 at the 95 per cent confidence limit. No star with a metallicity below -2.5 is confidently detected. Therefore, despite the unusually large size of the system (r(h) = 35.5(-1.2)(-1.4) pc), we conclude that Sgr II is an old and metal-poor globular cluster of the Milky Way.
Subject headings
- NATURVETENSKAP -- Fysik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences (hsv//eng)
Keyword
- Globular Clusters: individual: Sagittarius II
- Local Group
Publication and Content Type
- ref (subject category)
- art (subject category)
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Longeard, Nicola ...
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Martin, Nicolas
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Ibata, Rodrigo A ...
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Starkenburg, Els ...
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Jablonka, Pascal ...
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Aguado, David S.
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Carlberg, Raymon ...
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Côté, Patrick
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González Hernánd ...
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Lucchesi, Romain
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Malhan, Khyati
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Navarro, Julio F ...
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Sanchez-Janssen, ...
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Thomas, Guillaum ...
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Venn, Kim
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McConnachie, Ala ...
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- NATURAL SCIENCES
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NATURAL SCIENCES
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and Physical Science ...
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Monthly notices ...
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Stockholm University