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February 5, 2026

The Sagittarius stellar stream embedded in a fermionic dark matter halo

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Authors

SCSantiago CollazoMMMartín F. MestreCACarlos R. Argüelles

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Overview

This research explores dark matter halo models to analyze Sagittarius stream behavior, hinting at needed adjustments.

Key Points

  • The aim is to model the Sagittarius stream using a fermionic dark matter halo to match 6D observational data.
  • Utilized a spray algorithm with about 105 particles to simulate tidal debris.
  • Compared simulated debris against observed phase-space data of the Sagittarius stream.
  • Tested various parameter setups for the fermionic model, adjusting particle mass and halo morphologies.
  • The models successfully replicate the trailing arm of the Sagittarius stream.
  • The observed leading tail behavior cannot be matched by either power-law-like or polytropic halo configurations.
  • Improvements are required, including moving away from spherical symmetry and considering the influence of the Large Magellanic Cloud.

Cite This Study

Collazo et al. (2025) studied this question.

synapsesocial.com/papers/6984343ff1d9ada3c1fb23aehttps://doi.org/10.1051/0004-6361/202450867/pdf
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