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Durham University

Department of Physics

Staff profile

Publication details for Prof David Alexander

Yang(杨光), G., Brandt, W. N., Darvish, B., Chen(陳建廷), C.-T. J., Vito, F., Alexander, D. M., Bauer, F. E. & Trump, J. R. (2018). Does black-hole growth depend on the cosmic environment? Monthly Notices of the Royal Astronomical Society 480(1): 1022-1042.

Author(s) from Durham

Abstract

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 ≲ 1014 M⊙), 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.