It is well known that environment affects galaxy evolution, which is broadly related to supermassive black hole (SMBH) growth. We investigate whether SMBH evolution also depends on host-galaxy local (sub-Mpc) and global (≈1-10 Mpc) environment. We construct the surface-density field (local environment) and cosmic web (global environment) in the Cosmic Evolution Survey (COSMOS) field at z = 0.3-3.0. The environments in COSMOS range from the field to clusters (Mhalo ≥ 1014M⊙), covering the environments where ≈99 per cent of galaxies in the Universe reside. We measure sample-averaged SMBH accretion rate (BHAR) from X-ray observations, and study its dependence on overdensity and cosmic-web environment at different redshifts while controlling for galaxy stellar mass (M*). Our results show that BHAR does not significantly depend on overdensity or cosmic-web environment once M* is controlled, indicating that environment-related physical mechanisms (e.g. tidal interaction and ram-pressure stripping) might not significantly affect SMBH growth. We find that BHAR is strongly related to host-galaxy M*, regardless of environment.
All Science Journal Classification (ASJC) codes
- Astronomy and Astrophysics
- Space and Planetary Science