S5: The destruction of a bright dwarf galaxy as revealed by the chemistry of the Indus stellar stream

S5 Collaboration

Research output: Contribution to journalArticlepeer-review

Abstract

The recently discovered Indus stellar stream exhibits a diverse chemical signature compared to what is found for most other streams due to the abundances of two outlier stars, Indus_0 and Indus_13. Indus_13, exhibits an extreme enhancement in rapid neutron-capture (r-)process elements with [Eu=Fe] = +1:81. It thus provides direct evidence of the accreted nature of r-process enhanced stars. In this paper we present a detailed chemical analysis of the neutron-capture elements in Indus_13, revealing the star to be slightly actinide poor. The other
outlier, Indus_0, displays a globular cluster-like signature with high N, Na, and Al abundances, while the rest of the Indus stars show abundances compatible with a dwarf galaxy origin. Hence, Indus_0 provides the first chemical evidence of a fully disrupted dwarf containing a globular cluster. We use the chemical signature of the Indus stars to discuss the nature of the stream progenitor which was likely a chemically evolved system, with a mass somewhere in the range from Ursa Minor to Fornax.
Original languageEnglish
Pages (from-to)1-11
Number of pages11
JournalAstrophysical Journal
Volume915
Issue number2
DOIs
Publication statusPublished - 13 Jul 2021

Fingerprint

Dive into the research topics of 'S5: The destruction of a bright dwarf galaxy as revealed by the chemistry of the Indus stellar stream'. Together they form a unique fingerprint.

Cite this