Back to Search
Start Over
The Relationship of Supermassive Black Holes and Host Galaxies at z < 4 in the Deep Optical Variability-selected Active Galactic Nuclei Sample in the COSMOS Field.
- Source :
- Astrophysical Journal; 7/1/2024, Vol. 969 Issue 1, p1-9, 9p
- Publication Year :
- 2024
-
Abstract
- We present the study on the relationship between supermassive black holes (SMBHs) and their host galaxies using our variability-selected active galactic nuclei (AGNs) sample (i <subscript>AB</subscript> ≤ 25.9 and z ≤ 4.5) constructed from the Hyper Suprime-Cam Subaru Strategic Program Ultradeep survey in the COSMOS field. We estimated the black hole (BH) mass (M <subscript>BH</subscript> = 10<superscript>5.5−10</superscript> M <subscript>⊙</subscript>) based on the single-epoch virial method and the total stellar mass (M <subscript>star</subscript> = 10<superscript>10−12</superscript> M <subscript>⊙</subscript>) by separating the AGN component with spectral energy distribution fitting. We found that the redshift evolution of the BH–stellar mass ratio (M <subscript>BH</subscript>/ M <subscript>star</subscript>) depends on the M <subscript>BH</subscript>, which is caused by no significant correlation between M <subscript>BH</subscript> and M <subscript>star</subscript>. Variable AGNs with massive SMBHs (M <subscript>BH</subscript> > 10<superscript>9</superscript> M <subscript>⊙</subscript>) at 1.5 < z < 3 show considerably higher BH–stellar mass ratios (> ∼1%) than the BH–bulge ratios (M <subscript>BH</subscript>/ M <subscript>bulge</subscript>) observed in the local Universe for the same BH range. This implies that there is a typical growth path of massive SMBHs, which is faster than the formation of the bulge component as final products seen in the present day. For the low-mass SMBHs (M <subscript>BH</subscript> < 10<superscript>8</superscript> M <subscript>⊙</subscript>) at 0.5 < z < 3, on the other hand, variable AGNs show similar BH–stellar mass ratios with the local objects (∼0.1%), but smaller than those observed at z > 4. We interpret that host galaxies harboring less massive SMBHs at intermediate redshift have already acquired sufficient stellar mass, although high- z galaxies are still in the early stage of galaxy formation relative to those at the intermediate/local Universe. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 0004637X
- Volume :
- 969
- Issue :
- 1
- Database :
- Complementary Index
- Journal :
- Astrophysical Journal
- Publication Type :
- Academic Journal
- Accession number :
- 178050728
- Full Text :
- https://doi.org/10.3847/1538-4357/ad414c