How to form bulges/ellipticals in dark halos as fast as central black holes?

TL;DR

This paper explores how rapid formation of bulges and ellipticals in dark matter halos can occur through gas collapse triggered by gravity, with feedback mechanisms from central black holes regulating the process, aligning with observed galaxy properties.

Contribution

It presents a model linking gas collapse in dark halos to spheroid formation and black hole growth, incorporating feedback to explain observed relations.

Findings

Gas collapse triggers starbursts and spheroid formation.

Feedback from black hole radiation regulates gas collapse.

Model reproduces observed galaxy scaling relations.

Abstract

Gravity is nearly a universal constant in the cusp of an NFW galaxy halo. Inside this external field an isothermal gas sphere will collapse and trigger a starburst if above a critical central pressure. Thus formed spheroidal stellar systems have Sersic-profile and satisfy the Faber-Jackson relation. The process is consistent with observed starbursts. We also recover the M_BH vs. velocity dispersion relation, if the gas collapse is regulated or resisted by the feedback from radiation from the central BH.