Globular clusters in the Sagittarius stream. Revising members and candidates with Gaia DR2
Journal
Date Issued
2020
Author(s)
Abstract
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.
Volume
636
Start page
A107
Issn Identifier
0004-6361
Ads BibCode
2020A&A...636A.107B
Rights
open.access
File(s)![Thumbnail Image]()
Loading...
Name
aa37621-20.pdf
Description
Pdf editoriale
Size
2.54 MB
Format
Adobe PDF
Checksum (MD5)
5e03e33467df3c2585142c737cf38ae4