A universal model for the evolution of tidally stripped systems

TL;DR

This paper introduces a universal, zero-parameter energy-truncation model that accurately predicts the structural evolution of tidally stripped dark matter subhaloes across various initial profiles, with implications for dark matter detection.

Contribution

The paper extends the energy-truncation model to multiple profiles, demonstrating its universality and accuracy in predicting subhalo evolution during tidal stripping.

Findings

Model accurately predicts mass loss across different profiles.

Central density remains conserved during stripping.

Implications for dark matter annihilation calculations.

Abstract

Accurate models of the structural evolution of dark matter subhaloes, as they orbit within larger systems, are fundamental to understanding the detailed distribution of dark matter at the present day. Numerical simulations of subhalo evolution support the idea that the mass loss associated with tidal stripping is most naturally understood in energy space, with the particles that are the least bound being removed first. Starting from this premise, we recently proposed a zero-parameter "energy-truncation model" for subhalo evolution. We tested this model with simulations of tidal stripping of satellites with initial NFW profiles, and showed that the energy-truncation model accurately predicts both the mass loss and density profiles. In this work, we apply the model to a variety of Hernquist, Einasto and King profiles. We show that it matches the simulation results quite closely in all cases, indicating that it may serve as a universal model to describe tidally stripped collisionless systems. A key prediction of the energy-truncation model is that the central density of dark matter subhaloes is conserved as they lose mass; this has important implications for dark matter annihilation calculations, and for other observational tests of dark matter.