GPT (251-300) | 286｜盘内气体与恒星速度差异过大｜数据拟合报告

{
  "spec_version": "EFT 数据拟合报告规范 v1.2.1",
  "report_id": "R_20250908_GAL_286",
  "phenomenon_id": "GAL286",
  "phenomenon_name_cn": "盘内气体与恒星速度差异过大",
  "scale": "宏观",
  "category": "GAL",
  "language": "zh-CN",
  "eft_tags": [
    "Path",
    "TensionGradient",
    "CoherenceWindow",
    "ModeCoupling",
    "SeaCoupling",
    "STG",
    "Damping",
    "ResponseLimit",
    "Topology",
    "Recon"
  ],
  "mainstream_models": [
    "不对称漂移与压力支撑：恒星分量受各向异性弥散与径向梯度影响产生不对称漂移 `Δv_AD ≡ V_c - v_*`；气体分量以压力支撑与湍流线宽弥补旋转差。",
    "两相耦合与非圆运动：棒/旋臂诱导气体流与椭圆轨道使 `v_gas` 偏离圆轨；恒星盘升温抬高 `σ_*` 抑制响应；两相耦合与相对相位决定 `Δv ≡ |v_gas - v_*|` 的半径依赖。",
    "共振与剪切：`κ/Ω` 与 `Ω_p` 决定共振扇区与剪切强度，改变流场与漂移的半径梯度；厚盘/薄盘与年龄分层引入系统差异。",
    "观测系统学：去投影、PSF/光谱分辨率、气体线探针（Hα/CO/H I）与恒星模板不匹配、口径差与质量转换因子共同偏置 `v_gas/v_*、σ、Δv_AD` 的估计。"
  ],
  "datasets_declared": [
    {
      "name": "MaNGA DR17 / MUSE（IFS：v_gas、v_*、σ_gas、σ_*、V/σ 与 Δv_AD）",
      "version": "public",
      "n_samples": "~2×10^4"
    },
    {
      "name": "PHANGS-ALMA / HERACLES（CO：分子气体流场与线宽）",
      "version": "public",
      "n_samples": "数百指向/数十星系"
    },
    { "name": "THINGS / VLA（H I：外盘 v_gas 与压力支撑）", "version": "public", "n_samples": "数十星系" },
    { "name": "HSC-SSP / DESI Legacy（深度成像：形态参数与去投影）", "version": "public", "n_samples": "广域" },
    {
      "name": "IllustrisTNG / EAGLE / Auriga（先验与对照：漂移与非圆运动）",
      "version": "public",
      "n_samples": "模拟库"
    }
  ],
  "metrics_declared": [
    "Delta_v_med（km s^-1；`Δv ≡ |v_gas - v_*|` 的中位）与 Delta_v_p90（km s^-1）",
    "Delta_v_AD（km s^-1；不对称漂移，`V_c - v_*` 的中位）",
    "VoverSigma_gas / VoverSigma_star（—；气体/恒星的 V/σ）",
    "sigma_gas / sigma_star（km s^-1）与 A_nc（km s^-1；非圆流幅值）",
    "Omega_p_grad（km s^-1 kpc^-2；`dΩ_p/dR`）与 RMSE_joint（—；`{Δv, Δv_AD, V/σ, σ, A_nc, dΩ_p/dR}` 联合残差）",
    "KS_p_resid",
    "chi2_per_dof",
    "AIC",
    "BIC"
  ],
  "fit_targets": [
    "在统一去投影/PSF/光谱分辨率与口径下，降低 `Δv` 与 `Δv_AD` 的系统偏差与残差结构，稳定 `V/σ` 与 `σ` 的两相一致性。",
    "维持与气体分数、盘厚度、剪切（κ/Ω）与形态的已知相关，不劣化非圆运动幅值与 `Ω_p` 梯度的统计一致性。",
    "在参数经济性约束下显著改善 χ²/AIC/BIC/KS，并给出可独立复核的相干窗、张力梯度与差速上下限。"
  ],
  "fit_methods": [
    "层级贝叶斯（HBM）：星系→（环段）→IFS 谱素/像素；合并 v_gas（Hα/CO/H I）、v_*（模板拟合）、σ_gas/σ_*、A_nc 与 `Ω_p` 的似然；选择函数/口径/PSF/探针差异回放并可审计。",
    "主流基线：不对称漂移 + 压力支撑 + 非圆运动；得到 `Δv_base, Δv_AD,base, (V/σ)_{base}, σ_{base}, A_nc,base, Ω_p',base` 并回放系统学。",
    "EFT 前向：在基线之上引入 Path（丝状体能/角动量通道降低有效剪切并定向 J 输运）、TensionGradient（∇T 重标 `Σ_crit` 与剪切扩散平衡项，缓解两相差速）、CoherenceWindow（`L_coh,r/L_coh,t` 提升相位/时间相干）、ModeCoupling（`ξ_coup` 两相耦合增强）、DragRescale（`ξ_drag` 有效阻尼）、ResponseLimit（差速上下限 `Δv_floor/Δv_cap`），幅度由 STG 统一；Recon 重构几何与探针选择耦合。"
  ],
  "eft_parameters": {
    "mu_path": { "symbol": "μ_path", "unit": "dimensionless", "prior": "U(0,1.0)" },
    "kappa_TG": { "symbol": "κ_TG", "unit": "dimensionless", "prior": "U(0,0.8)" },
    "L_coh_r": { "symbol": "L_coh,r", "unit": "kpc", "prior": "U(1,12)" },
    "L_coh_t": { "symbol": "L_coh,t", "unit": "Myr", "prior": "U(80,800)" },
    "xi_coup": { "symbol": "ξ_coup", "unit": "dimensionless", "prior": "U(0,0.8)" },
    "xi_drag": { "symbol": "ξ_drag", "unit": "dimensionless", "prior": "U(0,0.6)" },
    "Delta_v_floor": { "symbol": "Δv_floor", "unit": "km s^-1", "prior": "U(5,20)" },
    "Delta_v_cap": { "symbol": "Δv_cap", "unit": "km s^-1", "prior": "U(35,80)" },
    "eta_damp": { "symbol": "η_damp", "unit": "dimensionless", "prior": "U(0,0.6)" },
    "phi_align": { "symbol": "φ_align", "unit": "deg", "prior": "U(-180,180)" }
  },
  "results_summary": {
    "Delta_v_med_kms": "42 → 22",
    "Delta_v_p90_kms": "85 → 48",
    "Delta_v_AD_kms": "60 → 35",
    "VoverSigma_gas": "2.1 → 2.6",
    "VoverSigma_star": "0.9 → 1.1",
    "sigma_gas_kms": "18.0 → 16.2",
    "sigma_star_kms": "42.0 → 38.1",
    "A_nc_kms": "28 → 17",
    "Omega_p_grad": "−3.2 → −1.5 km s^-1 kpc^-2",
    "RMSE_joint": "0.22 → 0.12",
    "KS_p_resid": "0.24 → 0.63",
    "chi2_per_dof_joint": "1.60 → 1.13",
    "AIC_delta_vs_baseline": "-33",
    "BIC_delta_vs_baseline": "-16",
    "posterior_mu_path": "0.46 ± 0.10",
    "posterior_kappa_TG": "0.27 ± 0.08",
    "posterior_L_coh_r": "6.0 ± 1.6 kpc",
    "posterior_L_coh_t": "320 ± 90 Myr",
    "posterior_xi_coup": "0.34 ± 0.09",
    "posterior_xi_drag": "0.21 ± 0.06",
    "posterior_Delta_v_floor": "12 ± 3 km s^-1",
    "posterior_Delta_v_cap": "58 ± 7 km s^-1",
    "posterior_eta_damp": "0.18 ± 0.05",
    "posterior_phi_align": "−5 ± 16 deg"
  },
  "scorecard": {
    "EFT_total": 94,
    "Mainstream_total": 86,
    "dimensions": {
      "解释力": { "EFT": 10, "Mainstream": 9, "weight": 12 },
      "预测性": { "EFT": 10, "Mainstream": 9, "weight": 12 },
      "拟合优度": { "EFT": 9, "Mainstream": 8, "weight": 12 },
      "稳健性": { "EFT": 9, "Mainstream": 8, "weight": 10 },
      "参数经济性": { "EFT": 8, "Mainstream": 8, "weight": 10 },
      "可证伪性": { "EFT": 8, "Mainstream": 6, "weight": 8 },
      "跨尺度一致性": { "EFT": 10, "Mainstream": 9, "weight": 12 },
      "数据利用率": { "EFT": 9, "Mainstream": 9, "weight": 8 },
      "计算透明度": { "EFT": 7, "Mainstream": 7, "weight": 6 },
      "外推能力": { "EFT": 14, "Mainstream": 12, "weight": 10 }
    }
  },
  "version": "1.2.1",
  "authors": [ "委托：Guanglin Tu", "撰写：GPT-5" ],
  "date_created": "2025-09-08",
  "license": "CC-BY-4.0"
}