{
  "abstract": "Two-halo galactic conformity is commonly interpreted as a manifestation of galaxy assembly bias, but its statistical structure and physical origin remain unclear. We aim to write the quenched-neighbour statistic in correlation-function form, test whether its scale dependence follows the linear matter correlation function $ξ_{\\rm mm}^{\\rm lin}(r)$, and separate the contributions of halo-mass bias and assembly bias to its amplitude. Using galaxies in IllustrisTNG300-1 at $z=0$, we measure the two-halo galactic conformity statistic of quenched neighbours at distance $r$, $Δf_{Q}(r)$, and related quantities in real space, compute the required correlations, perform shuffling tests at fixed halo mass, compare several $Δf$ observables, and explore the transformed family $G_n$. We show explicitly that $Δf_{Q}(r)$ can be written directly in terms of correlation functions and that, over $\\sim 2$--$40\\,h^{-1}\\,\\mathrm{Mpc}$, it is well described by $A_{\\rm fit}\\,ξ_{\\rm mm}^{\\rm lin}(r)$. Thus nonlinear and baryonic terms do not dominate the residual scale dependence isolated by this statistic. Halo-mass bias alone predicts lower amplitudes than measured, while fixed-mass shuffling strongly suppresses the signal; in TNG300 the amplitude is therefore dominated by galaxy assembly bias at fixed halo mass. Quenching, colour, and concentration share a common rescaled shape, whereas stellar-mass and halo-mass splits do not. These results suggest that galaxy assembly bias sets the amplitude of two-halo conformity, while the double-difference structure of the statistic suppresses nonlinear residuals when the compared populations have similar halo-mass and transition-scale structure.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": "2607.04022",
  "author_total": 3,
  "authors": [
    {
      "name": "Nelson Padilla"
    },
    {
      "name": "Ivan Lacerna"
    },
    {
      "name": "Dante Paz"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/39tzna7wnt0fj.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2607.04022",
  "fulltext_url": null,
  "id": "39tzna7wnt0fj",
  "issns": [],
  "landing_url": "https://arxiv.org/abs/2607.04022",
  "language": null,
  "licence": "LicenseRef-arXiv-nonexclusive-1.0",
  "licence_label": "arXiv licence",
  "licence_source": "article",
  "licence_url": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
  "metadata_licence": "CC0-1.0",
  "native_subjects": [
    [
      "arxiv",
      "astro-ph.CO"
    ],
    [
      "arxiv",
      "astro-ph.GA"
    ],
    [
      "openalex",
      "3103|Galaxies: Formation, Evolution, Phenomena"
    ]
  ],
  "openalex": "W7167592940",
  "pdf_url": "https://arxiv.org/pdf/2607.04022",
  "pmcid": null,
  "pmid": null,
  "published": "2026-07-21",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/39tzna7wnt0fj.ris",
  "sources": [
    {
      "first_seen": "2026-11-03T12:20:58Z",
      "native_id": "2607.04022",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2607.04022"
    }
  ],
  "subjects": [
    {
      "field": "astronomy",
      "origin": "arxiv:astro-ph.CO",
      "subfield": "cosmology"
    },
    {
      "field": "astronomy",
      "origin": "arxiv:astro-ph.GA",
      "subfield": "galaxies"
    }
  ],
  "title": "Assembly bias from nuisance to probe I: the relation between galactic conformity and the linear matter clustering",
  "title_text": "Assembly bias from nuisance to probe I: the relation between galactic conformity and the linear matter clustering",
  "type": "preprint",
  "updated_at": "2026-11-05T15:20:17Z",
  "url": "https://research.draconitic.com/paper/39tzna7wnt0fj",
  "venue": "arXiv",
  "versions": [
    {
      "doi": "10.1051/0004-6361/202660834",
      "pid": null,
      "relation": "published-as",
      "title": null,
      "venue": null
    }
  ]
}