In:
The Astrophysical Journal, American Astronomical Society, Vol. 922, No. 2 ( 2021-12-01), p. 142-
Abstract:
We measure the evolution of the BH – ⋆ relation using 584 uniformly selected Sloan Digital Sky Survey quasars at 0.2 〈 z 〈 0.8. The black hole masses ( BH ) are derived from the single-epoch virial mass estimator using the H β emission line and span the range 7.0 〈 log BH / M ⊙ 〈 9.5 . The host-galaxy stellar masses ( ⋆ ), which cover the interval 10.0 〈 log ⋆ / M ⊙ 〈 11.5 , 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 BH – ⋆ 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., BH / ⋆ 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 BH – ⋆ relation, which has a best inference of 0.25 − 0.04 + 0.03 dex, consistent with the local value. The redshift evolution of the BH – ⋆ 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 BH – ⋆ 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 BH – bulge relation may evolve as previously seen at higher redshifts.
Type of Medium:
Online Resource
ISSN:
0004-637X
,
1538-4357
DOI:
10.3847/1538-4357/ac2301
Language:
Unknown
Publisher:
American Astronomical Society
Publication Date:
2021
detail.hit.zdb_id:
2207648-7
detail.hit.zdb_id:
1473835-1
SSG:
16,12
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