Synchronized Coevolution between Supermassive Black Holes and Galaxies over the Last Seven Billion Years as Revealed by Hyper Suprime-Cam

Junyao Li, John D. Silverman, Xuheng Ding, Michael A. Strauss, Andy Goulding, Malte Schramm, Hassen M. Yesuf, Mouyuan Sun, Yongquan Xue, Simon Birrer, Jingjing Shi, Yoshiki Toba, Tohru Nagao, Masatoshi Imanishi

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18 Scopus citations


We measure the evolution of the MBH-M relation using 584 uniformly selected Sloan Digital Sky Survey quasars at 0.2 < z < 0.8. The black hole masses (MBH) are derived from the single-epoch virial mass estimator using the Hβ emission line and span the range . The host-galaxy stellar masses (M*), which cover the interval, are determined by performing two-dimensional quasar-host decomposition of the Hyper Suprime-Cam images and spectral energy distribution fitting. To quantify sample selection biases and measurement uncertainties on the mass terms, a mock quasar sample is constructed to jointly constrain the redshift evolution of the MBH-M* relation and its intrinsic scatter (σ μ ) through forward modeling. We find that the level of evolution is degenerate with σ μ , such that both a positive mild evolution (i.e., increases with redshift) with a small σ μ and a negative mild evolution with a larger σ μ are consistent with our data. The posterior distribution of σ μ enables us to put a strong constraint on the intrinsic scatter of the MBH-M* relation, which has a best inference of 0.25-0.04+0.03 dex, consistent with the local value. The redshift evolution of the MBH-M* relation relative to the local relation is constrained to be (1+z)0.12-0.27+0.28, in agreement with no significant evolution since z ∼ 0.8. The tight and unevolving MBH-M* relation is suggestive of a coupling through active galactic nuclei feedback or/and a common gas supply at work, thus restricting the mass ratio of galaxies and their black holes to a limited range. Given the considerable stellar disk component, the MBH-Mbulge relation may evolve as previously seen at higher redshifts.

Original languageEnglish (US)
Article number142
JournalAstrophysical Journal
Issue number2
StatePublished - Dec 1 2021

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science


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