SMBH Spherically Symmetric Accretion Regulated by Violent Star Formation Feedback

TL;DR

This paper models how violent star formation feedback in Seyfert galaxies influences black hole accretion, showing that the star formation region's properties regulate the black hole's growth and luminosity through a bimodal hydrodynamic solution.

Contribution

It introduces a self-consistent model linking star formation feedback to black hole accretion regulation via a bimodal hydrodynamic solution with a critical stagnation radius.

Findings

Black hole accretion is regulated by star formation feedback.

The stagnation radius determines the division between accreted matter and wind.

The model predicts a direct link between starburst parameters and black hole activity.

Abstract

The mounting evidence for violent nuclear star formation in Seyfert galaxies has led us to consider the hydrodynamics of the matter reinserted by massive stars through strong stellar winds and supernovae, under the presence of a central massive BH. We show that in all cases there is a bimodal solution strongly weighted by the location of the stagnation radius (Rst), which splits the star cluster into two different zones. Matter reinserted within the stagnation volume is to be accreted by the BH while its outer counterpart would composed a star cluster wind. The mechanical power of the latter, ensures that there is no accretion of the ISM into the BH and thus the BH accretion and its luminosity is regulated by the star formation feedback. The location of the stagnation radius is a function of three parameters: the BH mass, the mechanical power (or mass) of the star formation event and the size of the star forming region. Here we present our self-consistent, stationary solution, discuss the accretion rates and BH luminosities and show that our model predicts the intrinsic link between the BH activity and the starburst parameters.