Evidence of a Dwarf Galaxy Stream Populating the Inner Milky Way Halo

Stellar streams produced from dwarf galaxies provide direct evidence of the hierarchical formation Milky Way. Here, we present first comprehensive study LMS-1 stellar stream, that detect by searching for wide in Gaia EDR3 data set using STREAMFINDER algorithm. This stream was recently discovered Yuan et al. We as a 60° long to north galactic bulge, at distance ∼20 kpc Sun, together with additional components suggest overall is completely wrapped around inner Galaxy. Using spectroscopic measurements Large Sky Area Multi-Object Fiber Spectroscopic Telescope, Sloan Digital Survey, and Apache Point Observatory Galactic Evolution Experiment, infer very metal-poor (〈[Fe/H]〉 = −2.1) significant metallicity dispersion (σ[Fe/H] 0.4), it possesses large radial velocity (σv 20 ± 4 km s−1). These estimates imply galaxy stream. The orbit close polar, an inclination 75° plane. Both are remarkably similar globular clusters NGC 5053, 5024, Indus. findings make important contributor population Way halo.