{
  "name": "WISE-based AGN and IR Galaxy Classification Tree",
  "description": "A decision tree for identifying AGN candidates and classifying infrared luminous galaxies using WISE multi-band photometry.",
  "version": "1.0",
  "parameters": {
    "W1_AB": "WISE W1 band AB magnitude (3.4 μm)",
    "W2_AB": "WISE W2 band AB magnitude (4.6 μm)",
    "W3_AB": "WISE W3 band AB magnitude (12 μm)",
    "W4_AB": "WISE W4 band AB magnitude (22 μm)",
    "W1_W2_color": "Color index: W1 - W2, sensitive to hot dust and AGN",
    "L_IR_Lsun": "Total infrared luminosity from 8–1000 μm (in solar units)",
    "AGN_confidence": "Confidence score for AGN classification",
    "is_strong_AGN": "Boolean flag indicating strong AGN signature",
    "SNR_W1": "Signal-to-noise ratio in W1 band",
    "SNR_W2": "Signal-to-noise ratio in W2 band",
    "quality_flag": "Data quality flag (e.g., saturated, blended)",
    "z_fastspec": "Redshift from fast spectroscopic pipeline"
  },
  "decision_tree": [
    {
      "step": 1,
      "condition": "W1_W2_color > 0.8",
      "description": "Use W1-W2 color to identify potential AGN (hot dust or accretion disk)",
      "if_true": "Classification: 潜在AGN候选体",
      "if_false": "Classification: AGN可能性较低"
    },
    {
      "step": 2,
      "condition": "L_IR_Lsun >= 1e11",
      "description": "Infrared luminosity threshold for LIRG",
      "if_true": "Go to step 3",
      "if_false": "Classification: LIRG (亮红外星系)"
    },
    {
      "step": 3,
      "condition": "L_IR_Lsun >= 1e12",
      "description": "Threshold for ULIRG",
      "if_true": "Go to step 4",
      "if_false": "Classification: ULIRG (极亮红外星系)"
    },
    {
      "step": 4,
      "condition": "L_IR_Lsun >= 1e13",
      "description": "Threshold for HyLIRG",
      "if_true": "Go to step 5",
      "if_false": "Classification: HyLIRG (高红移亮红外星系)"
    },
    {
      "step": 5,
      "condition": "L_IR_Lsun >= 1e14",
      "description": "Threshold for ELIRG",
      "if_true": "Classification: ELIRG (极端亮红外星系)",
      "if_false": "Classification: ELIRG (极端亮红外星系)"
    }
  ],
  "classification_mapping": {
    "潜在AGN候选体": "W1-W2 色指数偏红，可能由活动星系核或尘埃遮蔽驱动",
    "AGN可能性较低": "W1-W2 色指数正常，更可能是恒星形成主导",
    "LIRG (亮红外星系)": "L_IR ≥ 10¹¹ L☉，典型星暴星系",
    "ULIRG (极亮红外星系)": "L_IR ≥ 10¹² L☉，强星暴或合并系统",
    "HyLIRG (高红移亮红外星系)": "L_IR ≥ 10¹³ L☉，高红移早期宇宙中的剧烈恒星形成",
    "ELIRG (极端亮红外星系)": "L_IR ≥ 10¹⁴ L☉，宇宙中最极端的红外源，常与 AGN-星暴共存"
  },
  "inference_rules": [
    {
      "rule_id": "R1",
      "condition": "W1_W2_color > 0.8 AND SNR_W1 > 5 AND SNR_W2 > 5",
      "conclusion": "High-confidence AGN candidate",
      "reasoning": "Strong color excess with good signal-to-noise supports AGN activity."
    },
    {
      "rule_id": "R2",
      "condition": "L_IR_Lsun >= 1e14 AND is_strong_AGN == True",
      "conclusion": "Extreme AGN-dominated system",
      "reasoning": "Very high IR luminosity combined with AGN signature suggests powerful accretion."
    },
    {
      "rule_id": "R3",
      "condition": "L_IR_Lsun >= 1e12 AND has_optical == False",
      "conclusion": "Possible obscured AGN or dusty merger",
      "reasoning": "High IR luminosity but no optical counterpart may indicate heavy obscuration."
    },
    {
      "rule_id": "R4",
      "condition": "L_IR_Lsun < 1e11 AND W1_W2_color < 0.8",
      "conclusion": "Normal star-forming galaxy",
      "reasoning": "Low IR luminosity and normal color suggest typical star formation without AGN."
    }
  ],
  
   "references": [
  {
    "id": "ref1",
    "citation": "Fanaroff, B. L., & Riley, J. M. 1974, MNRAS, 167, P31",
    "description": "Original definition of FR I and FR II radio galaxies based on morphology."
  }]
}