QAG SPARC Data

Endpoint

GET https://qag-sparc-data.vercel.app/galaxies175.json  (CORS *)

Also served: galaxies175.full.json (full fidelity + provenance) · cross_validation.json (Stålhammar cross-framework series) · replication.json (Replication Lab: equal-freedom, held-out, and blind-test verdicts — failures included)

Try it live

Fetch galaxy

// pick a galaxy and hit Fetch — raw JSON appears here

Schema

{
  "galaxies": {
    "<NAME>": {
      "p": [v_inf_kms, r_aff_kpc],
      "c": [qag_chi2_red, mond_chi2_red, newton_chi2_red, qag_rms_kms],
      "f": flags (1 = LOW_DOF, 2 = r_aff pinned),
      "pts": [[r_kpc, v_obs, err, v_baryon], …]
    }
  }
}

v_baryon = √(0.5·(v_disk² + v_bulge²) + v_gas²), Υ★ = 0.5. Curves: Newton v = v_bar; QAG v² = v_bar² + v_∞²(1−e^−r/r_aff); MOND via the simple interpolating function, a₀ = 1.2×10⁻¹⁰ m/s².

Provenance

Source: SPARC database (Lelli, McGaugh & Schombert 2016). Ingestion: ingest_sparc.py v1.0.0 with per-file SHA1 manifest. Fits: sweep_v3.py per-galaxy least squares. Full-fidelity source (all points, full precision) + build script: github.com/Sir-Ripley/qag-sparc-data.