{
  "name": "Radio Source Classification Tree",
  "description": "A decision tree for classifying radio sources based on morphology and flux metrics.",
  "version": "1.0",
  "parameters": {
    "SNR": "Peak / Error, used in SNR detection",
    "DC_Maj_arcsec": "Major axis of detected component in arcseconds",
    "BMAJ_arcsec": "Beam major axis in arcseconds",
    "Flux_Ratio": "Ratio of core to total flux",
    "Offset_Ratio": "Offset between peak and center normalized by beam size",
    "Peak_Offset_Arcsec": "Physical offset of peak from center"
  },
  "decision_tree": [
    {
      "step": 1,
      "condition": "SNR < 5.0",
      "description": "Check if signal-to-noise ratio is low",
      "if_true": "Classification: Noise",
      "if_false": "Go to step 2"
    },
    {
      "step": 2,
      "condition": "DC_Maj_arcsec <= 1.5 * BMAJ_arcsec",
      "description": "Check if source is compact (size ≤ 1.5 × beam)",
      "if_true": "Classification: Compact",
      "if_false": "Go to step 3"
    },
    {
      "step": 3,
      "condition": "Offset_Ratio <= 0.3 OR Flux_Ratio > 0.5",
      "description": "FR classification: core-dominated or high-flux ratio",
      "if_true": "Classification: FR I (core bright / core dominant)",
      "if_false": "Classification: FR II (edge-brightened / double-lobed)"
    }
  ],
  "classification_mapping": {
    "Noise": "低信噪比，无法分辨真实源",
    "Compact": "尺寸小，致密源",
    "FR I": "核心主导型，可能为爆发或活动星系核",
    "FR II": "边缘增亮型，双瓣结构，典型射电星系"
  },

  "references": [
  {
    "id": "ref1",
    "citation": "Fanaroff, B. L., & Riley, J. M. 1974, MNRAS, 167, 31P",
    "description": "Original definition of the Fanaroff-Riley (FR) classification, distinguishing FR I and FR II radio galaxies based on the relative position of high-brightness regions."
  },
  {
    "id": "ref2",
    "citation": "Best, P. N., & Heckman, T. M. 2012, MNRAS, 421, 1569",
    "description": "Investigates the fundamental dichotomy in the radio-AGN population (HERG vs. LERG), linking radio source evolution to accretion modes and host galaxy properties."
  },
  {
    "id": "ref3",
    "citation": "Mingo, B., et al. 2019, MNRAS, 488, 2701",
    "description": "Revisits the Fanaroff-Riley dichotomy using the LOFAR Two-Metre Sky Survey (LoTSS), analyzing morphological parameters like the Concentration Index to classify complex sources."
  }]
}