{
  "id": "astro-ph/0609042",
  "version": "v1",
  "published": "2006-09-01T21:33:38.000Z",
  "updated": "2006-09-01T21:33:38.000Z",
  "title": "The evolution of the number density of large disk galaxies in COSMOS",
  "authors": [
    "M. T. Sargent",
    "C. M. Carollo",
    "S. J. Lilly",
    "C. Scarlata",
    "R. Feldmann",
    "P. Kampczyk",
    "A. M. Koekemoer",
    "N. Scoville",
    "J. -P. Kneib",
    "A. Leauthaud",
    "R. Massey",
    "J. Rhodes",
    "L. A. M. Tasca",
    "P. Capak",
    "H. J. McCracken",
    "C. Porciani",
    "A. Renzini",
    "Y. Taniguchi",
    "D. J. Thompson",
    "K. Sheth",
    "for the COSMOS collaboration"
  ],
  "comment": "Accepted for publication in the ApJ COSMOS special issue. A version with figures in higher resolution is available at http://www.exp-astro.phys.ethz.ch/sargent/manuscripts/ApJS_sizes.pdf",
  "doi": "10.1086/516584",
  "categories": [
    "astro-ph"
  ],
  "abstract": "We study a sample of approximately 16,500 galaxies with I_AB <= 22.5 in the COSMOS field. Structural information on the galaxies is derived by fitting single Sersic models to their two-dimensional surface brightness distributions. We investigate the evolution of the number density of disk galaxies larger than 5 kpc between redshift z~1 and the present epoch. To this end, we use the measurements of the half-light radii to construct, as a function of redshift, the size function of both the total disk galaxy population and of disk galaxies split in four bins of bulge-to-disk ratio. Furthermore, we use a selected sample of roughly 1800 SDSS galaxies to calibrate our results with respect to the local universe. We find that: (i) The number density of disk galaxies with intermediate sizes (r_{1/2}~5-7 kpc) remains nearly constant from z~1 to today. (ii) The number density of the largest disks (r_{1/2}>7 kpc) decreases by a factor of about two out to z~1. (iii) There is a constancy in the number density of large bulgeless disks out to z~1; the deficit of large disks at early epochs seems to arise from a smaller number of bulged disks. Our results indicate that the bulk of the large disk galaxy population has completed its growth by z~1, and support the hypothesis that secular evolution processes produce - or at least add stellar mass to - the bulge components of disk galaxies.",
  "revisions": [
    {
      "version": "v1",
      "updated": "2006-09-01T21:33:38.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "number density",
      "secular evolution processes produce",
      "large disk galaxy population",
      "add stellar mass",
      "bulge components"
    ],
    "tags": [
      "journal article"
    ],
    "note": {
      "typesetting": "TeX",
      "pages": 0,
      "language": "en",
      "license": "arXiv",
      "status": "editable",
      "inspire": 725227
    }
  }
}