Globular clusters in the Sagittarius stream Revising members and candidates with Gaia DR2

被引：55

作者：

Bellazzini, M. ^{[1
]}

Ibata, R. ^{[2
]}

Malhan, K. ^{[3
]}

Martin, N. ^{[2
,5
]}

Famaey, B. ^{[2
]}

Thomas, G. ^{[4
]}

机构：

[1] INAF Osservatorio Astrofis & Sci Spazio Bologna, Via Gobetti 93-3, I-40129 Bologna, Italy

[2] Univ Strasbourg, CNRS, Observ Astron, 11 Rue Univ, F-67000 Strasbourg, France

[3] Stockholm Univ, Dept Phys, Oskar Klein Ctr, AlbaNova, S-10691 Stockholm, Sweden

[4] NRC Herzberg Astron & Astrophys, 5071 West Saanich Rd, Victoria, BC V9E 2E7, Canada

[5] Max Planck Inst Astron, Konigstuhl 17, D-69117 Heidelberg, Germany

来源：

ASTRONOMY & ASTROPHYSICS | 2020年 / 636卷

基金：

欧洲研究理事会;

关键词：

globular clusters; general; galaxies; individual; Sgr dSph; dwarf; Galaxy; formation; stellar content; DWARF SPHEROIDAL GALAXY; MILKY-WAY; PROPER MOTIONS; TIDAL STREAM; SKY SURVEY; ACS SURVEY; STARS; HALO; ABUNDANCES; MORPHOLOGY;

D O I：

10.1051/0004-6361/202037621

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We reconsider the case for the association of Galactic globular clusters to the tidal stream of the Sagittarius dwarf spheroidal galaxy (Sgr dSph) using Gaia DR2 data. We used RR Lyrae variables to trace the stream in 6D and we selected clusters matching the observed stream in position and velocity. In addition to the clusters residing in the main body of the galaxy (M 54, Ter 8, Ter 7, Arp 2) we confirm the membership of Pal 12 and Whiting 1 to the portion of the trailing arm populated by stars lost during recent perigalactic passages. NGC 2419, NGC 5634, and NGC 4147 are very interesting candidates, possibly associated with more ancient wraps of the Sagittarius stream. With the exception of M 54, which lies within the stellar nucleus of the galaxy, we note that all these clusters are found in the trailing arm of the stream. The selected clusters are fully consistent with the [Fe/H] versus [Mg/Fe], [Ca/Fe] patterns and the age-metallicity relation displayed by field stars in the main body of Sgr dSph.

引用

页数：9

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