2026-04-17T23:32:50Zhttps://recercat.cat/oai/request
oai:recercat.cat:2445/2183582025-12-05T16:13:54Zcom_2072_1057col_2072_478904col_2072_478917
RECERCAT author Arita, J. author Kashikawa, N. author Matsuoka, Y. author He, W. author Ito, K. author Liang, Y. author Ishimoto, R. author Yoshioka, T. author Takeda, Y. author Iwasawa, Kazushi author Onoue, M. author Toba, Y. author Imanishi, M. 2025-01-31T16:54:48Z2025-01-31T16:54:48Z20232025-01-31T16:54:48Z We present, for the first time, dark matter halo (DMH) mass measurement of quasars at z ∼ 6 based on a clustering analysis of 107 quasars. Spectroscopically identified quasars are homogeneously extracted from the Hyper Suprime-Cam Strategic Survey Program wide layer over 891 deg2. We evaluate the clustering strength by three different autocorrelation functions: projected correlation function, angular correlation function, and redshift–space correlation function. The DMH mass of quasars at z ∼ 6 is evaluated as with the bias parameter b = 20.8 ± 8.7 by the projected correlation function. The other two estimators agree with these values; though, each uncertainty is large. The DMH mass of quasars is found to be nearly constant ∼1012.5h−1M⊙ throughout cosmic time, suggesting that there is a characteristic DMH mass where quasars are always activated. As a result, quasars appear in the most massive halos at z ∼ 6, but in less extreme halos thereafter. The DMH mass does not appear to exceed the upper limit of 1013h−1M⊙, which suggests that most quasars reside in DMHs with across most of the cosmic time. Our results supporting a significant increasing bias with redshift are consistent with the bias evolution model with inefficient active galactic nucleus feedback at z ∼ 6. The duty cycle (fduty) is estimated as 0.019 ± 0.008 by assuming that DMHs in some mass interval can host a quasar. The average stellar mass is evaluated from stellar-to-halo mass ratio as, which is found to be consistent with [C ii] observational results. (c) American Astronomical Society, 2023 info:eu-repo/semantics/openAccess Quàsars Forats negres (Astronomia) Galàxies Quasars Black holes (Astronomy) Galaxies Subaru High-z Exploration of Low-luminosity Quasars (SHELLQs). XVIII. The Dark Matter Halo Mass of Quasars at z ∼ 6 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion