Observable detail · GAL
UDG dynamics (NGC 1052-DF2/DF4)
| Prediction / mechanism | NGC 1052-DF2/DF4 ultra-diffuse galaxies show low \(\sigma_v\); DCT predicts the observed kinematics from the Avrami profile. |
|---|---|
| Measured | van Dokkum 2018 NGC 1052-DF2 dynamics. |
| Residual / status | SOFT |
| Status | SOFT |
| Source paper | DCT-DM-01 |
Mechanism
Avrami P(g) profile reproduces the low velocity dispersion at high mass-to-light ratio.
Derivation
The derivation chain follows the cluster paper DCT-DM-01 and reduces to the canonical DCT constants (\(P_0 = 0.851\), \(\omega_0 = 50{,}037\), \(c_{BD} = 138{,}189\), master identity \(2\omega_0 + 3 = c_{BD} \cdot P_0^2 = 100{,}077\)). See the cluster paper for the full multi-line derivation.
Methodology
| Domain | Galactic / astrophysical (GAL) |
|---|---|
| Input data source | See "References" below for the canonical public-archive citation. |
| Measurement procedure | The measured value used here is the most recent peer-reviewed central value plus 1σ uncertainty from the cited reference. |
| Acceptance threshold | HIT: residual within 1σ of measurement. SOFT: directional agreement within bracketing range. OPEN: untested or unresolved. |
| Falsification threshold | MISS: prediction excluded at ≥3σ by the canonical measurement under the corpus-canonical (constant-\(P_0\)) treatment. |
| Current status | See verdict pill above. |
Python verification
Verification script: astrophysical_tests.py. Run with python3 astrophysical_tests.py to reproduce the canonical DCT result against the public-archive measurement source listed below.
Cross-references
Related observables: sparc-rar · dwarf-core-cusp.
Aggregate views: /predictions/ · /scorecard/ · /empirical/ · /outstanding-problems/.
Audit notes
This sub-page is part of the post-build-out of the observable archive (see the observable index). Verdict reflects the corpus-canonical (constant-\(P_0\)) treatment. The cluster-paper deep-link above (DCT-DM-01) is the canonical source of the derivation chain.
References
- van Dokkum et al. 2018
- Source paper: DCT-DM-01
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