Final results of the search for new Milky Way satellites in the Hyper Suprime-Cam Subaru Strategic Program survey: Discovery of two more candidates

Homma, Daisuke; Chiba, Masashi; Komiyama, Yutaka; Tanaka, Masayuki; Okamoto, Sakurako; Tanaka, Mikito; Ishigaki, Miho N.; Hayashi, Kohei; Arimoto, Nobuo; Lupton, Robert H.; Strauss, Michael A.; Miyazaki, Satoshi; Wang, Shiang-Yu; Murayama, Hitoshi

doi:10.1093/pasj/psae044

Title: Final results of the search for new Milky Way satellites in the Hyper Suprime-Cam Subaru Strategic Program survey: Discovery of two more candidates

Journal Article · 07 June 2024 · Publications of the Astronomical Society of Japan

DOI: https://doi.org/10.1093/pasj/psae044 · OSTI ID:2371588

Homma, Daisuke; Chiba, Masashi; Komiyama, Yutaka; Tanaka, Masayuki; Okamoto, Sakurako; Tanaka, Mikito; Ishigaki, Miho N.; Hayashi, Kohei; Arimoto, Nobuo; Lupton, Robert H.; Strauss, Michael A.; Miyazaki, Satoshi;

; Murayama, Hitoshi

Abstract 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 ∼1140 deg2. In addition to three candidates that we have already reported, we have identified two new MW satellite candidates in the constellations of Sextans, at a heliocentric distance of D⊙ ≃ 126 kpc, and Virgo, at D⊙ ≃ 151 kpc, named Sextans II and Virgo III, respectively. Their luminosities (Sext II: MV ≃ −3.9 mag; Vir III: MV ≃ −2.7 mag) and half-light radii (Sext II: rh ≃ 154 pc; Vir III: rh ≃ 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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Sponsoring Organization:: USDOE

OSTI ID:: 2371588

Journal Information:: Publications of the Astronomical Society of Japan, Journal Name: Publications of the Astronomical Society of Japan Journal Issue: 4 Vol. 76; ISSN 0004-6264

Publisher:: Oxford University PressCopyright Statement

Country of Publication:: Japan

Language:: English

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