Data Access
Access simulation data products and cluster catalogues from the Manticore project. All data products are freely available for scientific use and collaboration.
Manticore-Local
The Manticore-Local simulation suite represents a Bayesian constrained realization of the nearby Universe within 200 Mpc. These dark matter-only simulations were generated using the SWIFT N-body code, providing 80 posterior samples of local cosmic structure.
Simulation Specifications
| Posterior Simulation Name | Box Size (Mpc) | Particle Mass ($M_{\odot}$) | h | $\Omega_m$ | $n_{\text{realizations}}$ |
|---|---|---|---|---|---|
| Manticore-Local | 1000 | $3.7 \times 10^{10}$ | 0.681 | 0.306 | 80 |
Data Products Overview
| Product Name | Description | Reference |
|---|---|---|
| Posteriors of Prominent Clusters | Full posterior PDFs for positions, masses (M200, M500), sizes, and velocities of 14 well-known local clusters (e.g. Virgo, Coma, Perseus). Counterparts are selected using the Pfeifer p-value from the LUM framework; typical detections are 2–4σ across realizations, with sky offsets ≲1°. | McAlpine et al. (2025) |
| Posterior Halo Accociations Catalogue | Posterior catalogue of 225 cluster-scale halo associations (⟨M200⟩ ≥ 1014 M⊙; ≥ 40 members) identified consistently across the 80 Manticore-Local realizations. Includes observer-centric positions, M200/M500, sizes, velocities, concentrations, and sky coordinates. Validation includes stacked Planck PR4 tSZ detections and X-ray cross-matches. | McAlpine et al. (2025) |
| Posterior Void Catalogue | Bayesian catalogue of 100 high-significance voids identified with VIDE across 50 Manticore-Local posterior realizations. Provides posterior PDFs for void centers and effective radii, plus morphology via a Voronoi-overlap "cloud" representation. Void detections pass a conservative 5σ threshold. | Malandrino et al. (2025) |
| Velocity and Density Fields | Gridded N = 2563 density and momentum fields at z=0 for each of the 80 Manticore-Local realizations (L=1000 Mpc; 3.9 Mpc cells). Particle data are SPH-smoothed onto the grid. | McAlpine et al. (2025) |
1. Posteriors of Prominent Clusters
- Description: Posterior distributions for 14 prominent galaxy clusters within the local (R < 200 Mpc) Universe. Cluster counterparts are identified with the LUM (Pfeifer et al. 2023) probability p(r, M200). Across the posterior ensemble these systems are recovered at ≈2–4σ significance and within ≲1° of their observed sky positions. The table below lists the median values and interquartile range, the full per-realization samples are hosted at VizieR (link below).
- Reference: McAlpine et al. (2025) - The Manticore Project I: a digital twin of our cosmic neighbourhood from Bayesian field-level analysis
- Notes: Coordinates X, Y, Z are given in the equatorial simulation frame. Subtract the observer position (500, 500, 500 Mpc) to convert to the observed frame.
| Cluster Name | RA (deg) | DEC (deg) | Distance (Mpc) | Pfeifer p-value ($10^4$) | Angular sep (arcmin) | $M_{200}$ ($10^{14} M_{\odot}$) | $R_{200}$ (kpc) | $M_{500}$ ($10^{14} M_{\odot}$) | $R_{500}$ (kpc) | $V_{r,\text{pec}}$ (km/s) | $V_{r,\text{cosmo}}$ (km/s) | $X_{\text{eq}}$ (Mpc) | $Y_{\text{eq}}$ (Mpc) | $Z_{\text{eq}}$ (Mpc) |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Prominent Clusters (CSV)
Download the table above. The table lists median values with 25th–75th percentile ranges.
Download CSVAnalysis Scripts
Python notebook with analysis examples for loading the VizieR catalogue data
View on GitHub2. Posterior Halo Associations Catalogue
- Description: A posterior catalogue of 225 massive halo associations—probabilistic analogues of individual clusters—built by grouping central haloes that recur in consistent locations across the 80 Manticore-Local realizations. Each association includes posterior distributions for position, M200/M500, size (R200, R500), and velocities, reported in an observer-centric equatorial frame. Robustness is demonstrated via stacked Planck PR4 NILC tSZ detections and comparisons to MCXC-II and eROSITA X-ray mass scales.
- Reference: McAlpine et al. (2025) - The Manticore-Local Cluster Catalogue: A Posterior Map of Massive Structures in the Nearby Universe
Click to view complete catalogue contents
Halo Properties
Positions & Sizes (Mpc):
BoundSubhalo_CentreOfMass: 3D position of bound subhalo centerSO_200_crit_CentreOfMass: Center of mass for R200 overdensitySO_200_crit_SORadius: R200 spherical overdensity radiusSO_500_crit_CentreOfMass: Center of mass for R500 overdensitySO_500_crit_SORadius: R500 spherical overdensity radiusdist: Comoving distance from observer
Masses (M☉):
BoundSubhalo_TotalMass: Total bound massSO_200_crit_TotalMass: M200 massSO_500_crit_TotalMass: M500 mass
Velocities (km/s):
BoundSubhalo_CentreOfMassVelocity: 3D velocityBoundSubhalo_MaximumCircularVelocity: V_maxvr: Radial velocity
Angular Coordinates (degrees):
ra,dec: Equatorial coordinatesgal_l,gal_b: Galactic coordinates
Other Properties:
SO_200_crit_Concentration: NFW concentrationassociation_id: Unique cluster identifiercluster_size: Number of member halos
3. Posterior Void Catalogue
- Description: A Bayesian posterior catalogue of 100 cosmic voids in the nearby Universe, built by running the VIDE void finder on 50 independent Manticore-Local realizations and clustering recurring void centers. For each void we provide posterior distributions for its center (α, δ, distance) and effective radius, along with a Voronoi-overlap morphology ("cloud") that captures the full, non-spherical shape. Detections meet a strict 5σ acceptance criterion (chance probability < 6×10−7), ensuring a high-purity sample for cosmology and environment studies.
- Reference: Malandrino et al. (2025) - A Bayesian catalog of 100 high-significance voids in the Local Universe
4. Velocity and Density Fields
- Description: Gridded N = 2563 fields of the L = 1000 Mpc parent domain (cell size 3.9 Mpc), generated at z=0 for all 80 Manticore-Local realizations. Simulation particles are mapped to the grid using an SPH kernel to produce the density field and the momentum field (ρ v).
- Reference: McAlpine et al. (2025) - The Manticore Project I: a digital twin of our cosmic neighbourhood from Bayesian field-level analysis
Data Access Tutorial
Jupyter notebook demonstrating how to download and use velocity and density fields with the manticore_data package
View Tutorialmanticore_data Package
Python package for convenient access to Manticore velocity and density field data
View DocumentationManticore-Deep
The Manticore-Deep simulation suite will extend our Bayesian reconstruction to significantly larger volumes and deeper redshifts, combining data from SDSS and BOSS galaxy surveys.
Coming Soon
The Manticore-Deep data products are currently in preparation. Check back soon for updates.