Extending the chemical reach of the H3 survey: detailed abundances of the dwarf-galaxy stellar stream Wukong/LMS-1

Limberg, Guilherme; Ji, Alexander P.; Naidu, Rohan P.; Chiti, Anirudh; Rossi, Silvia; Usman, Sam A.; Ting, Yuan-Sen; Zaritsky, Dennis; Bonaca, Ana; Borbolato, Lais; Speagle, Joshua S.; Chandra, Vedant; Conroy, Charlie

doi:10.1093/mnras/stae969

Title: Extending the chemical reach of the H3 survey: detailed abundances of the dwarf-galaxy stellar stream Wukong/LMS-1

Journal Article · 09 April 2024 · Monthly Notices of the Royal Astronomical Society

DOI: https://doi.org/10.1093/mnras/stae969 · OSTI ID:2340959

;

; Naidu, Rohan P.; Chiti, Anirudh;

; Usman, Sam A.;

;

; Borbolato, Lais; Speagle, Joshua S.;

; Conroy, Charlie

ABSTRACT We present the first detailed chemical-abundance analysis of stars from the dwarf-galaxy stellar stream Wukong/LMS-1 covering a wide metallicity range ($$-3.5 \lt \rm [Fe/H] \lesssim -1.3$$). We find abundance patterns that are effectively indistinguishable from the bulk of Indus and Jhelum, a pair of smaller stellar streams proposed to be dynamically associated with Wukong/LMS-1. We confirmed a carbon-enhanced metal-poor star ($$\rm [C/Fe] \gt +0.7$$ and $$\rm [Fe/H] \sim -2.9$$) in Wukong/LMS-1 with strong enhancements in Sr, Y, and Zr, which is peculiar given its solar-level [Ba/Fe]. Wukong/LMS-1 stars have high abundances of α elements up to $$\rm [Fe/H] \gtrsim -2$$, which is expected for relatively massive dwarfs. Towards the high-metallicity end, Wukong/LMS-1 becomes α-poor, revealing that it probably experienced fairly standard chemical evolution. We identified a pair of N- and Na-rich stars in Wukong/LMS-1, reminiscent of multiple stellar populations in globular clusters. This indicates that this dwarf galaxy contained at least one globular cluster that was completely disrupted in addition to two intact ones previously known to be associated with Wukong/LMS-1, which is possibly connected to similar evidence found in Indus. From these ≥3 globular clusters, we estimate the total mass of Wukong/LMS-1 to be $${\approx }10^{10} \, \mathrm{M}_\odot$$, representing ∼1 per cent of the present-day Milky Way. Finally, the [Eu/Mg] ratio in Wukong/LMS-1 continuously increases with metallicity, making this the first example of a dwarf galaxy where the production of r-process elements is clearly dominated by delayed sources, presumably neutron-star mergers.

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Sponsoring Organization:: USDOE

OSTI ID:: 2340959

Journal Information:: Monthly Notices of the Royal Astronomical Society, Journal Name: Monthly Notices of the Royal Astronomical Society Journal Issue: 3 Vol. 530; ISSN 0035-8711

Publisher:: Oxford University PressCopyright Statement

Country of Publication:: United Kingdom

Language:: English

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