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An Accurate Comprehensive Approach to Substructure: I. Accreted Subhaloes
Cosmology and Nongalactic Astrophysics · Submitted 14 Sep 2021
abstract compiled · 2026-09-23 · no language-model review
The authors' main claim Overall, our results demonstrate that CUSP is a powerful tool for understanding halo substructure and extending the results of simulations to haloes with arbitrary masses, redshifts and formation times in any hierarchical cosmology endowed with random Gaussian density perturbations.
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This is the first of a series of three Papers devoted to the study of halo substructure in hierarchical cosmologies by means of the CUSP formalism. In the present Paper we derive the properties of subhaloes and diffuse dark matter (dDM) accreted onto haloes and their progenitors. Specifically, we relate the dDM present at any time in the inter-halo medium of the real Universe or a cosmological simulation with the corresponding free-streaming mass or the halo resolution mass, respectively, and establish the link between subhaloes and their seeds in the initial density field. By monitoring the collapse and virialisation of haloes, we derive from first principles and with no single free parameter the abundance and radial distribution of dDM and subhaloes accreted onto them. Our predictions are in excellent agreement with the results of simulations, but for the predicted fraction of accreted dDM, which is larger than reported in previous works as they only count the dDM accreted onto the final halo, not onto its progenitors. The derivation pursued here clarifies the origin of some key features of substructure. Overall, our results demonstrate that CUSP is a powerful tool for understanding halo substructure and extending the results of simulations to haloes with arbitrary masses, redshifts and formation times in any hierarchical cosmology endowed with random Gaussian density perturbations.
background contribution method result interpretation main claim
| # | sentence | role | the authors' own work | states the main conclusion | strength |
|---|---|---|---|---|---|
| s0 | This is the first of a series of three Papers devoted to the study of halo substructure in hierarchical cosmologies by means of the CUSP formalism. | background 0.88 | 0.30 | 0.03 | asserted 1.00 |
| s1 | In the present Paper we derive the properties of subhaloes and diffuse dark matter (dDM) accreted onto haloes and their progenitors. | contribution 1.00 | 0.95 | 0.06 | asserted 0.95 |
| s2 | Specifically, we relate the dDM present at any time in the inter-halo medium of the real Universe or a cosmological simulation with the corresponding free-streaming mass or the halo resolution mass, respectively, and establish the link between subhaloes and their seeds in the initial density field. | contribution 0.95 | 0.87 | 0.07 | asserted 1.00 |
| s3 | By monitoring the collapse and virialisation of haloes, we derive from first principles and with no single free parameter the abundance and radial distribution of dDM and subhaloes accreted onto them. | method 0.75 | 0.97 | 0.20 | asserted 1.00 |
| s4 | Our predictions are in excellent agreement with the results of simulations, but for the predicted fraction of accreted dDM, which is larger than reported in previous works as they only count the dDM accreted onto the final halo, not onto its progenitors. | result 0.96 | 0.86 | 0.19 | asserted 1.00 |
| s5 | The derivation pursued here clarifies the origin of some key features of substructure. | interpretation 1.00 | 0.79 | 0.12 | asserted 0.97 |
| s6 | Overall, our results demonstrate that CUSP is a powerful tool for understanding halo substructure and extending the results of simulations to haloes with arbitrary masses, redshifts and formation times in any hierarchical cosmology endowed with random Gaussian density perturbations. | interpretation 0.97 | 0.86 | 0.68 | asserted 1.00 |
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Original abstract
This is the first of a series of three Papers devoted to the study of halo substructure in hierarchical cosmologies by means of the CUSP formalism. In the present Paper we derive the properties of subhaloes and diffuse dark matter (dDM) accreted onto haloes and their progenitors. Specifically, we relate the dDM present at any time in the inter-halo medium of the real Universe or a cosmological simulation with the corresponding free-streaming mass or the halo resolution mass, respectively, and establish the link between subhaloes and their seeds in the initial density field. By monitoring the collapse and virialisation of haloes, we derive from first principles and with no single free parameter the abundance and radial distribution of dDM and subhaloes accreted onto them. Our predictions are in excellent agreement with the results of simulations, but for the predicted fraction of accreted dDM, which is larger than reported in previous works as they only count the dDM accreted onto the final halo, not onto its progenitors. The derivation pursued here clarifies the origin of some key features of substructure. Overall, our results demonstrate that CUSP is a powerful tool for understanding halo substructure and extending the results of simulations to haloes with arbitrary masses, redshifts and formation times in any hierarchical cosmology endowed with random Gaussian density perturbations.
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References
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1 arXiv paper cite this in 1 sentence
Papers citing it
Uses its method or tool 1 paper
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With the aim to shed light on this issue, a novel approach was applied in Paper I [ref] making use of the so-called ConflUent System of Peak trajectories (CUSP) formalism [ref] .
An Accurate Comprehensive Approach to Substructure: II. Stripped Subhaloes · INTRODUCTION · 0.86
What it cites · 3 sentences without a confident label
Cites as background 1 paper
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Recently, simulations have included baryons in order to study dwarf satellites in MW analogs ( [ref] ).
Can cosmological simulations capture the diverse satellite populations of observed Milky Way analogues? · INTRODUCTION · 0.92
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