The Subaru HSC Galaxy Clustering with Photometric Redshift. I. Dark Halo Masses versus Baryonic Properties of Galaxies at 0.3 ≤ z ≤ 1.4

Shogo Ishikawa, Nobunari Kashikawa, Masayuki Tanaka, Jean Coupon, Alexie Leauthaud, Jun Toshikawa, Kohei Ichikawa, Taira Oogi, Hisakazu Uchiyama, Yuu Niino, Atsushi J. Nishizawa

Research output: Contribution to journalArticlepeer-review

Abstract

We present the clustering properties of low-z (z ≤ 1.4) galaxies selected by the Hyper Suprime-Cam Subaru Strategic Program Wide layer over 145 deg2. The wide-field and multiwavelength observation yields 5,064,770 galaxies at 0.3 ≤ z ≤ 1.4 with photometric redshifts and physical properties. This enables the accurate measurement of angular correlation functions, and the subsequent halo occupation distribution (HOD) analysis allows us to identify the connection between baryonic and dark halo properties. The fraction of less-massive satellite galaxies at z ≲ 1 is found to be almost constant at ∼20%, but it gradually decreases beyond. However, the abundance of satellite galaxies at z > 1 is quite small even for less-massive galaxies due to the rarity of massive centrals at high-z. This decreasing trend is connected to the small satellite fraction of Lyman break galaxies at z > 3. The stellar-to-halo mass ratios at 0.3 ≤ z ≤ 1.4 are almost consistent with the predictions obtained using the latest empirical model; however, we identify small excesses from the theoretical model at the massive end. The pivot halo mass is found to be unchanged at at 0.3 ≤ z ≤ 1.4, and we systematically show that is a universal pivot halo mass up to z ∼ 5 that is derived using only the clustering/HOD analyses. Nevertheless, halo masses with peaked instantaneous baryon conversion efficiencies are much smaller than the pivot halo mass regardless of redshift, and the most efficient stellar-mass assembly is thought to be in progress in dark halos.

Original languageEnglish
Article number128
JournalAstrophysical Journal
Volume904
Issue number2
DOIs
Publication statusPublished - 2020 Dec 1

Keywords

  • Dark matter (353)
  • Dark matter distribution (356)
  • Galaxy dark matter halos (1880)
  • Galaxy evolution (594)
  • Galaxy formation (595)
  • Large-scale structure of the universe (902)
  • Observational cosmology (1146)

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

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