{
  "id": "1502.07965",
  "version": "v1",
  "published": "2015-02-27T16:45:25.000Z",
  "updated": "2015-02-27T16:45:25.000Z",
  "title": "Star-formation histories of local luminous infrared galaxies",
  "authors": [
    "Miguel Pereira-Santaella",
    "Almudena Alonso-Herrero",
    "Luis Colina",
    "Daniel Miralles-Caballero",
    "Pablo G. Pérez-González",
    "Santiago Arribas",
    "Enrica Bellocchi",
    "Sara Cazzoli",
    "Tanio Díaz-Santos",
    "Javier Piqueras López"
  ],
  "comment": "16 pages + online material, accepted for publication in A&A",
  "categories": [
    "astro-ph.GA"
  ],
  "abstract": "We present the analysis of the integrated spectral energy distribution (SED) from the ultraviolet (UV) to the far-infrared and H$\\alpha$ of a sample of 29 local systems and individual galaxies with infrared (IR) luminosities between 10^11 Lsun and 10^11.8 Lsun. We have combined new narrow-band H$\\alpha$+[NII] and broad-band g, r optical imaging taken with the Nordic Optical Telescope (NOT), with archival GALEX, 2MASS, Spitzer, and Herschel data. The SEDs (photometry and integrated H$\\alpha$ flux) have been fitted with a modified version of the MAGPHYS code using stellar population synthesis models for the UV-near-IR range and thermal emission models for the IR emission taking into account the energy balance between the absorbed and re-emitted radiation. From the SED fits we derive the star-formation histories (SFH) of these galaxies. For nearly half of them the star-formation rate appears to be approximately constant during the last few Gyrs. In the other half, the current star-formation rate seems to be enhanced by a factor of 3-20 with respect to that occured ~1 Gyr ago. Objects with constant SFH tend to be more massive than starbursts and they are compatible with the expected properties of a main-sequence (M-S) galaxy. Likewise, the derived SFHs show that all our objects were M-S galaxies ~1 Gyr ago with stellar masses between 10^10.1 and 10^11.5 Msun. We also derived from our fits the average extinction (A_v=0.6-3 mag) and the polycyclic aromatic hydrocarbons (PAH) luminosity to L(IR) ratio (0.03-0.16). We combined the A_v with the total IR and H$\\alpha$ luminosities into a diagram which can be used to identify objects with rapidly changing (increasing or decreasing) SFR during the last 100 Myr.",
  "revisions": [
    {
      "version": "v1",
      "updated": "2015-02-27T16:45:25.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "local luminous infrared galaxies",
      "star-formation histories",
      "stellar population synthesis models",
      "luminosity",
      "thermal emission models"
    ],
    "note": {
      "typesetting": "TeX",
      "pages": 16,
      "language": "en",
      "license": "arXiv",
      "status": "editable"
    }
  }
}