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Research-Stack/6-Documentation/docs/stellar_gas_line_ratio_diagnostics_2026-05-09.md
Brandon Schneider a99e839bab Track remaining source and documentation inventory
2026-05-11 22:18:31 -05:00

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Stellar Gas Line Ratio Diagnostics

Date: 2026-05-09

Decision: ADMIT_LINE_RATIO_DIAGNOSTIC_SURFACE

Claim boundary: line-ratio proxy only. This does not prove a physical shock, AGN, stellar breakout, or ionization mechanism.

What Changed

The 35-element MaNGA emission-line arrays now have named channels, so physics can propagate through line ratios instead of anonymous vector positions.

rows seen:             43128
valid ratio rows:      42450
shock proxy support:   0.531801
shock proxy gate:      ADMIT_LINE_RATIO_SHOCK_PROXY_SUPPORT

Aggregate Ratios

Ratio Count Mean Median P90
log_nii_ha 42357 -0.308976 -0.338542 0.0904
log_sii_ha 42266 -0.271433 -0.353311 0.096763
log_oi_ha 42253 -0.943352 -1.152453 -0.049001
log_oiii_hb 42278 -0.009821 -0.014188 0.467312
balmer_decrement 42308 59.793473 3.44199 4.852172
gas_sigma_1re_kms 42110 154.899503 77.729897 414.167969
shock_lier_score 43128 0.48278 0.35 1.0

Proxy Classes

{
  "bpt_proxy_classes": {
    "agn_liner_or_shock_proxy": 12417,
    "star_forming_proxy": 19567,
    "composite_proxy": 10228,
    "unclassified": 916
  },
  "shock_lier_proxy_classes": {
    "shock_lier_proxy": 18154,
    "partial_shock_proxy": 9563,
    "no_shock_proxy": 15411
  }
}

Physics Propagation

  • Saha/ionization now has line-ratio support, but still needs electron density and temperature.
  • Radiative transfer now has named flux and Balmer-decrement lanes, but still needs an attenuation model.
  • Shock excitation now has SII/Ha, OI/Ha, OIII/Hb, NII/Ha, and H-alpha sigma proxy support.