2021MNRAS.503.2754L

Query : 2021MNRAS.503.2754L

2021MNRAS.503.2754L - Mon. Not. R. Astron. Soc., 503, 2754-2762 (2021/May-2)

The pristine dwarf-galaxy survey - III. Revealing the nature of the Milky Way globular cluster Sagittarius II.

LONGEARD N., MARTIN N., IBATA R.A., STARKENBURG E., JABLONKA P., AGUADO D.S., CARLBERG R.G., COTE P., GONZALEZ HERNANDEZ J.I., LUCCHESI R., MALHAN K., NAVARRO J.F., SANCHEZ-JANSSEN R., THOMAS G.F., VENN K. and McCONNACHIE A.W.

Abstract (from CDS):

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 σvSgrII = 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]spectroSgrII = -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 (rh=35.5+1.4–1.2 pc), we conclude that Sgr II is an old and metal-poor globular cluster of the Milky Way.

Abstract Copyright: © 2021 The Author(s) Published by Oxford University Press on behalf of Royal Astronomical Society

Journal keyword(s): Globular Clusters: individual: Sagittarius II - Local Group

Nomenclature: Table 1: [LMS2020] JDDD.ddddd+DD.ddddd N=47 added.

Simbad objects: 59

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Number of rows : 59
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026 		#notes
1 NAME Segue 2 G 02 19 16.0 +20 10 31     15.2     ~ 299 0
2 NAME Sagittarius Stream St* 02 22 +00.0           ~ 1001 0
3 NAME Horologium II G 03 16 32.1 -50 01 05           ~ 76 0
4 NAME Col I G 05 31.4 -28 02           ~ 60 0
5 Cl Pal 5 GlC 15 16 05.30 -00 06 41.0   15.1       ~ 797 1
6 NAME Draco II Gl? 15 52 47.6 +64 33 55           ~ 138 0
7 [LMS2020] J297.96338-22.04654 Pe* 19 51 51.2140343895 -22 02 47.444517045           ~ 1 0
8 [LMS2020] J298.00202-21.92952 Pe* 19 52 00.5038165502 -21 55 45.864923827           ~ 1 0
9 [LMS2020] J298.01422-21.89008 Pe* 19 52 03.4330987612 -21 53 24.170766610           ~ 1 0
10 [LMS2020] J298.01474-21.91537 Pe* 19 52 03.5317657127 -21 54 55.153819969           ~ 1 0
11 [LMS2020] J298.01803-21.92193 Pe* 19 52 04.3529033623 -21 55 18.668522082           ~ 1 0
12 [LMS2020] J298.03665-22.04132 Pe* 19 52 08.8073118185 -22 02 28.629227978           ~ 1 0
13 [LMS2020] J298.05410-21.87831 Pe* 19 52 13.0022836080 -21 52 41.740773415           ~ 1 0
14 [LMS2020] J298.05710-22.02942 Pe* 19 52 13.7120217824 -22 01 45.774943688           ~ 1 0
15 [LMS2020] J298.06312-22.11093 Pe* 19 52 15.1485265701 -22 06 39.347889295           ~ 1 0
16 [LMS2020] J298.08415-21.96661 Pe* 19 52 20.1845154373 -21 57 59.337698437           ~ 1 0
17 [LMS2020] J298.09544-22.14968 Pe* 19 52 22.9211075353 -22 08 58.536816806           ~ 1 0
18 [LMS2020] J298.11270-22.04758 Pe* 19 52 27.0551993616 -22 02 51.285049775           ~ 1 0
19 [LMS2020] J298.11950-22.02530 Pe* 19 52 28.6884458417 -22 01 31.085383080           ~ 1 0
20 [LMS2020] J298.13014-22.14273 Pe* 19 52 31.2439594847 -22 08 33.862545834           ~ 1 0
21 [LMS2020] J298.13415-22.04367 Pe* 19 52 32.1996665317 -22 02 37.210307259           ~ 1 0
22 [LMS2020] J298.14121-22.06475 Pe* 19 52 33.8908722248 -22 03 53.088615842           ~ 1 0
23 [LMS2020] J298.14290-22.07784 Pe* 19 52 34.3055929656 -22 04 40.228265604           ~ 2 0
24 [LMS2020] J298.14837-22.04551 Pe* 19 52 35.6115083808 -22 02 43.866071713           ~ 1 0
25 PSO J298.1495-22.1070 Pe* 19 52 35.8980396176 -22 06 25.374474368           ~ 2 0
26 [LMS2020] J298.15185-22.09654 Pe* 19 52 36.4490816544 -22 05 47.594662044           ~ 2 0
27 [LMS2020] J298.15270-22.08463 Pe* 19 52 36.6515527968 -22 05 04.635109032           ~ 2 0
28 [LMS2020] J298.15344-22.04959 Pe* 19 52 36.8254505712 -22 02 58.526722248           ~ 3 0
29 [LMS2020] J298.16019-22.09027 Pe* 19 52 38.4620742306 -22 05 24.902399018           ~ 1 0
30 PSO J298.1664-22.0676 Pe* 19 52 39.9422493547 -22 04 03.699934315           ~ 2 0
31 NAME Sagittarius II Gl? 19 52 40.5 -22 04 05           ~ 97 0
32 [LMS2020] J298.17751-22.16337 Pe* 19 52 42.6134203521 -22 09 48.048915924           ~ 1 0
33 [LMS2020] J298.18099-22.20728 Pe* 19 52 43.4531360977 -22 12 26.135881283           ~ 1 0
34 [LMS2020] J298.18145-22.07735 Pe* 19 52 43.5550658760 -22 04 38.439847308           ~ 3 0
35 [LMS2020] J298.18438-21.93702 Pe* 19 52 44.2564046069 -21 56 13.122637752           ~ 1 0
36 [LMS2020] J298.18958-21.84866 Pe* 19 52 45.5075980921 -21 50 55.202209972           ~ 1 0
37 [LMS2020] J298.19043-22.03676 Pe* 19 52 45.7107194256 -22 02 12.326540748           ~ 2 0
38 [LMS2020] J298.19280-22.05979 Pe* 19 52 46.2850392000 -22 03 35.248536144           ~ 2 0
39 [LMS2020] J298.19388-22.07918 Pe* 19 52 46.5374948352 -22 04 45.047644716           ~ 2 0
40 PSO J298.1940-22.0863 Pe* 19 52 46.5753234457 -22 05 11.017411511           ~ 2 0
41 [LMS2020] J298.19512-22.09244 Pe* 19 52 46.8326772720 -22 05 32.819092692           ~ 2 0
42 [LMS2020] J298.20794-21.86545 Pe* 19 52 49.9146982812 -21 51 55.622034531           ~ 1 0
43 [LMS2020] J298.20960-22.07638 Pe* 19 52 50.3061514527 -22 04 34.788359642           ~ 1 0
44 [LMS2020] J298.21019-22.05475 Pe* 19 52 50.4503627952 -22 03 17.083075284           ~ 2 0
45 [LMS2020] J298.21550-22.08104 Pe* 19 52 51.7242449784 -22 04 51.728446884           ~ 2 0
46 [LMS2020] J298.21784-22.06409 Pe* 19 52 52.2895476912 -22 03 50.713020720           ~ 2 0
47 [LMS2020] J298.23141-22.10773 Pe* 19 52 55.5609210956 -22 06 27.816699574           ~ 1 0
48 [LMS2020] J298.23845-22.11143 Pe* 19 52 57.2273306367 -22 06 41.192097517           ~ 1 0
49 [LMS2020] J298.24280-21.97804 Pe* 19 52 58.2843830351 -21 58 40.779306423           ~ 1 0
50 PSO J298.2566-22.0404 Pe* 19 53 01.5855414267 -22 02 25.465523068           ~ 2 0
51 [LMS2020] J298.27457-22.00481 Pe* 19 53 05.9085847265 -22 00 17.262355835           ~ 1 0
52 [LMS2020] J298.27562-22.01614 Pe* 19 53 06.1607112869 -22 00 58.093843014           ~ 1 0
53 [LMS2020] J298.28018-22.12346 Pe* 19 53 07.2402340840 -22 07 24.425232846           ~ 1 0
54 [LMS2020] J298.28281-21.92996 Pe* 19 53 07.8802659627 -21 55 47.837742855           ~ 1 0
55 [LMS2020] J298.36550-22.00547 Pe* 19 53 27.7222175968 -22 00 19.642717748           ~ 1 0
56 [LMS2020] J298.36878-22.01959 Pe* 19 53 28.51 -22 01 10.5           ~ 1 0
57 [LMS2020] J298.37718-21.98293 Pe* 19 53 30.5283158365 -21 58 58.581658999           ~ 1 0
58 NAME Tuc III G 23 56.6 -59 36           ~ 229 0
59 NAME Local Group GrG ~ ~           ~ 9325 0

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