Final Results of Search for New Milky Way Satellites in the Hyper Suprime-Cam Subaru Strategic Program Survey: Discovery of Two More Candidates
arxiv(2023)
摘要
We present the final results of our search for new Milky Way (MW) satellites
using the data from the Hyper Suprime-Cam (HSC) Subaru Strategic Program (SSP)
survey over ∼ 1,140 deg^2. In addition to three candidates that we
already reported, we have identified two new MW satellite candidates in the
constellation of Sextans at a heliocentric distance of D_⊙≃
126kpc, and Virgo at D_⊙≃ 151kpc, named Sextans II and Virgo
III, respectively. Their luminosities (Sext II:M_V≃-3.9mag; Vir
III:M_V≃-2.7mag) and half-light radii (Sext II:r_h≃154 pc; Vir
III:r_h≃ 44 pc) place them in the region of size-luminosity space of
ultra-faint dwarf galaxies (UFDs). Including four previously known satellites,
there are a total of nine satellites in the HSC-SSP footprint. This discovery
rate of UFDs is much higher than that predicted from the recent models for the
expected population of MW satellites in the framework of cold dark matter
models, thereby suggesting that we encounter a too many satellites problem.
Possible solutions to settle this tension are also discussed.
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