Stellar Gas Population Grouping Study

Date: 2026-05-09

Decision: ADMIT_POPULATION_GROUPING_SURFACE

Claim boundary: MaNGA stellar-gas population grouping only. A coarse DESI/MaNGA cell join now exists; object-level crossmatch remains HOLD. Proxy classes do not prove physical shock, AGN, or gas mechanism.

Population Surface

rows seen, all DAP types: 43128
unique Plate-IFU count:   10782
selected population:      10782
preferred DAPTYPE:        HYB10-MILESHC-MASTARSSP

Aggregate

{
  "bpt_proxy_classes": {
    "agn_liner_or_shock_proxy": 2740,
    "star_forming_proxy": 5029,
    "composite_proxy": 2883,
    "unclassified": 130
  },
  "shock_lier_proxy_classes": {
    "shock_lier_proxy": 4589,
    "partial_shock_proxy": 2458,
    "no_shock_proxy": 3735
  },
  "partial_or_full_shock_fraction": 0.653589,
  "gas_sigma_summary": {
    "count": 10609,
    "min": 0.384927,
    "max": 929.010071,
    "mean": 157.969176,
    "median": 77.881104,
    "p90": 420.896637
  },
  "stellar_sigma_summary": {
    "count": 10297,
    "min": 3.115719,
    "max": 765.25354,
    "mean": 118.838681,
    "median": 94.604462,
    "p90": 233.339722
  }
}

Redshift Bins

Bin	Count	Shock+Partial Fraction	Gas Sigma Median	Stellar Sigma Median
`z_002_004`	4838	0.619678	55.327721	72.146851
`z_004_006`	2415	0.57764	78.61245	101.009289
`z_008_plus`	1250	0.896	284.684052	230.705811
`z_000_002`	1241	0.635778	30.074999	52.191267
`z_006_008`	1038	0.717726	157.058464	172.332016

DESI-Ready Sky/Redshift Cells

These are population cells for the existing coarse DESI/MaNGA cell join. They are not object-level DESI/MaNGA crossmatches and not DESI environment classes yet.

Cell	Count	Shock+Partial Fraction	Main BPT Counts
`ra03_north__z_002_004`	1622	0.676326	`{'star_forming_proxy': 811, 'agn_liner_or_shock_proxy': 342, 'composite_proxy': 437, 'unclassified': 32}`
`ra02_north__z_002_004`	1289	0.584174	`{'agn_liner_or_shock_proxy': 222, 'composite_proxy': 286, 'star_forming_proxy': 781}`
`ra04_north__z_002_004`	960	0.60625	`{'agn_liner_or_shock_proxy': 219, 'composite_proxy': 257, 'star_forming_proxy': 483, 'unclassified': 1}`
`ra02_north__z_004_006`	684	0.554094	`{'composite_proxy': 188, 'star_forming_proxy': 319, 'agn_liner_or_shock_proxy': 174, 'unclassified': 3}`
`ra03_north__z_004_006`	531	0.572505	`{'star_forming_proxy': 246, 'composite_proxy': 152, 'agn_liner_or_shock_proxy': 131, 'unclassified': 2}`
`ra00_north__z_000_002`	450	0.72	`{'star_forming_proxy': 214, 'agn_liner_or_shock_proxy': 79, 'composite_proxy': 117, 'unclassified': 40}`
`ra04_north__z_004_006`	420	0.6	`{'agn_liner_or_shock_proxy': 128, 'star_forming_proxy': 159, 'composite_proxy': 133}`
`ra03_north__z_006_008`	374	0.754011	`{'star_forming_proxy': 83, 'agn_liner_or_shock_proxy': 164, 'composite_proxy': 127}`
`ra02_north__z_008_plus`	364	0.881868	`{'agn_liner_or_shock_proxy': 163, 'composite_proxy': 143, 'star_forming_proxy': 58}`
`ra03_north__z_008_plus`	305	0.918033	`{'composite_proxy': 130, 'star_forming_proxy': 43, 'agn_liner_or_shock_proxy': 129, 'unclassified': 3}`
`ra03_north__z_000_002`	279	0.670251	`{'agn_liner_or_shock_proxy': 40, 'star_forming_proxy': 188, 'unclassified': 14, 'composite_proxy': 37}`
`ra02_north__z_000_002`	270	0.581481	`{'star_forming_proxy': 210, 'composite_proxy': 30, 'agn_liner_or_shock_proxy': 28, 'unclassified': 2}`

What This Gives Us

A population baseline over unique MaNGA Plate-IFU rows.
Grouped shock/LIER and BPT proxy counts by redshift and sky cell.
DESI-ready cells now used by the coarse DESI/MaNGA cell join.
Residual target: cells whose local gas state diverges from later DESI environment priors.

Receipt

shared-data/data/stellar_gas_observation/stellar_gas_population_grouping_study_receipt_*.json

Receipt Backlinks

Coarse cell join receipt: shared-data/data/stellar_gas_observation/desi_epoviz_manga_population_cell_join_receipt.json
Tiddler: 6-Documentation/tiddlywiki-local/wiki/tiddlers/Stellar Gas Population Grouping Study.tid

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