| Autor: |
Atsushi Hoshi, Toru Yamada, Mitsuru Kokubo, Yoshiki Matsuoka, Tohru Nagao |
| Jazyk: |
angličtina |
| Rok vydání: |
2024 |
| Předmět: |
|
| Zdroj: |
The Astrophysical Journal, Vol 969, Iss 1, p 11 (2024) |
| Druh dokumentu: |
article |
| ISSN: |
1538-4357 |
| DOI: |
10.3847/1538-4357/ad414c |
| Popis: |
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 _AB ≤ 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 _BH = 10 ^5.5−10 M _⊙ ) based on the single-epoch virial method and the total stellar mass ( M _star = 10 ^10−12 M _⊙ ) by separating the AGN component with spectral energy distribution fitting. We found that the redshift evolution of the BH–stellar mass ratio ( M _BH / M _star ) depends on the M _BH , which is caused by no significant correlation between M _BH and M _star . Variable AGNs with massive SMBHs ( M _BH > 10 ^9 M _⊙ ) at 1.5 < z < 3 show considerably higher BH–stellar mass ratios (> ∼1%) than the BH–bulge ratios ( M _BH / M _bulge ) 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 _BH < 10 ^8 M _⊙ ) 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. |
| Databáze: |
Directory of Open Access Journals |
| Externí odkaz: |
|
