{
  "id": "1802.01596",
  "version": "v1",
  "published": "2018-02-05T19:00:22.000Z",
  "updated": "2018-02-05T19:00:22.000Z",
  "title": "The mass-size relation of LRGs from BOSS and DECaLS",
  "authors": [
    "Ginevra Favole",
    "Antonio D. Montero-Dorta",
    "Francisco Prada",
    "Sergio A. Rodríguez-Torres",
    "David J. Schlegel"
  ],
  "comment": "11 pages, 7 figures",
  "categories": [
    "astro-ph.GA"
  ],
  "abstract": "We use the DECaLS DR3 survey photometry matched to the SDSS-III/BOSS DR12 spectroscopic catalog to investigate the morphology and stellar mass-size relation of luminous red galaxies (LRGs) within the CMASS and LOWZ galaxy samples in the redshift range $0.2<z<0.7$. The large majority of both samples is composed of early-type galaxies with De Vaucouleurs profiles, while only less than 20% are late-type exponentials. We calibrate DECaLS effective radii using the higher resolution CFHT/MegaCam observations and optimise the correction for each morphological type. By cross-matching the photometric properties of the early-type population with the Portsmouth stellar mass catalog, we are able to explore the high-mass end of the distribution using a large sample of 313,026 galaxies over 4380 deg$^{2}$. We find a clear correlation between the sizes and the stellar masses of these galaxies, which appears flatter than previous estimates at lower masses. The sizes of these early-type galaxies do not exhibit significant evolution within the BOSS redshift range, but a slightly declining redshift trend is found when these results are combined with $z\\sim0.1$ SDSS measurements at the high-mass end. The synergy between BOSS and DECaLS has important applications in other fields, including galaxy clustering and weak lensing.",
  "revisions": [
    {
      "version": "v1",
      "updated": "2018-02-05T19:00:22.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "mass-size relation",
      "sdss-iii/boss dr12 spectroscopic catalog",
      "decals dr3 survey photometry",
      "early-type galaxies",
      "redshift range"
    ],
    "note": {
      "typesetting": "TeX",
      "pages": 11,
      "language": "en",
      "license": "arXiv",
      "status": "editable"
    }
  }
}