{
  "id": "2409.08073",
  "version": "v1",
  "published": "2024-09-12T14:27:47.000Z",
  "updated": "2024-09-12T14:27:47.000Z",
  "title": "EDGE-INFERNO: Simulating every observable star in faint dwarf galaxies and their consequences for resolved-star photometric surveys",
  "authors": [
    "Eric P. Andersson",
    "Martin P. Rey",
    "Andrew Pontzen",
    "Corentin Cadiou",
    "Oscar Agertz",
    "Justin I. Read",
    "Nicolas F. Martin"
  ],
  "comment": "Submitted to ApJL, comments welcome",
  "categories": [
    "astro-ph.GA"
  ],
  "abstract": "Interpretation of data from faint dwarf galaxies is made challenging by observations limited to only the brightest stars. We present a major improvement to tackle this challenge by undertaking zoomed cosmological simulations that resolve the evolution of all individual stars more massive than $0.5\\,{\\rm M}_{\\odot}$, thereby explicitly tracking all observable stars for the Hubble time. For the first time, we predict observable color-magnitude diagrams and the spatial distribution of $\\approx 100,000$ stars within four faint ($M_{\\star} \\approx 10^5 \\, \\,{\\rm M}_{\\odot}$) dwarf galaxies directly from their cosmological initial conditions. In all cases, simulations predict complex light profiles with multiple components, implying that typical observational measures of structural parameters can make total V-band magnitudes appear up to 0.5 mag dimmer compared to estimates from simulations. Furthermore, when only small ($\\lessapprox100$) numbers of stars are observable, shot noise from realizations of the color-magnitude diagram introduces uncertainties comparable to the population scatter in, e.g., total magnitude, half-light radius, and mean iron abundance measurements. Estimating these uncertainties with fully self-consistent mass growth, star formation and chemical enrichment histories paves the way for more robust interpretation of dwarf galaxy data.",
  "revisions": [
    {
      "version": "v1",
      "updated": "2024-09-12T14:27:47.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "faint dwarf galaxies",
      "dwarf galaxy",
      "resolved-star photometric surveys",
      "observable star",
      "simulations predict complex light profiles"
    ],
    "note": {
      "typesetting": "TeX",
      "pages": 0,
      "language": "en",
      "license": "arXiv",
      "status": "editable"
    }
  }
}