The influence of mergers and ram-pressure stripping on black hole-bulge correlations

Abstract

We analyse the scatter in the correlation between super-massive black hole (SMBH) mass and bulge stellar mass of the host galaxy, and infer that it cannot be accounted for by mergers alone. The merger-only scenario, where small galaxies merge to establish a proportionality relation between the SMBH and bulge masses, leads to a scatter around the linear proportionality line that increases with the square root of the SMBH (or bulge) mass. By examining a sample of 103 galaxies we find that the intrinsic scatter increases more rapidly than expected from the merger-only scenario. The correlation between SMBH masses and their host galaxy properties is therefore more likely to be determined by a negative feedback mechanism that is driven by an active galactic nucleus. We find a hint that some galaxies with missing stellar mass reside close to the centre of clusters and speculate that ram-pressure stripping of gas off the young galaxy as it moves near the cluster centre, might explain the missing stellar mass at later times.

MNRAS, in press

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Cited by in corpus (5)

• The jet feedback mechanism (jfm) in stars, galaxies and clusters
• The most massive black holes on the Fundamental Plane of Black Hole Accretion
• Dwarf Galaxies and the Black-Hole Scaling Relations
• Concordance between observations and simulations in the evolution of the mass relation between supermassive black holes and their host galaxies
• Jet-driven active galactic nucleus feedback in galaxy formation before black hole formation