{
  "id": "1409.2876",
  "version": "v1",
  "published": "2014-09-09T20:00:14.000Z",
  "updated": "2014-09-09T20:00:14.000Z",
  "title": "Secular- and merger-built bulges in barred galaxies",
  "authors": [
    "J. Mendez-Abreu",
    "Victor P. Debattista",
    "E. M. Corsini",
    "J. A. L. Aguerri"
  ],
  "comment": "20 pages, 7 figures. Accepted for publication in A&A",
  "categories": [
    "astro-ph.GA"
  ],
  "abstract": "(Abridged) We study the incidence, as well as the nature, of composite bulges in a sample of 10 face-on barred galaxies to constrain the formation and evolutionary processes of the central regions of disk galaxies. We analyze the morphological, photometric, and kinematic properties of each bulge. Then, by using a case-by-case analysis we identify composite bulges and classify every component into a classical or pseudobulge. In addition, bar-related boxy/peanut (B/P) structures were also identified and characterised. We find only three galaxies hosting a single-component bulge (two pseudobulges and one classical bulge). We find evidence of composite bulges coming in two main types based on their formation: secular-built and merger- and secular-built. We call secular-built to composite bulges made of entirely by structures associated with secular processes such as pseudo bulges, central disks, or B/P bulges. We find four composite bulges of this kind in our sample. On the other hand, merger- and secular-built bulges are those where structures with different formation paths coexist within the same galaxy, i.e., a classical bulge coexisting with a secular-built structure (pseudobulge, central disk, or B/P). Three bulges of this kind were found in the sample. We remark on the importance of detecting kinematic structures such as sigma-drops to identify composite bulges. A large fraction (80%) of galaxies were found to host sigma-drops or sigma-plateaus in our sample revealing their high incidence in barred galaxies. The high frequency of composite bulges in barred galaxies points towards a complex formation and evolutionary scenario. Moreover, the evidence for coexisting merger- and secular-built bulges reinforce this idea. We discuss how the presence of different bulge types, with different formation histories and timescales, can constrain current models of bulge formation.",
  "revisions": [
    {
      "version": "v1",
      "updated": "2014-09-09T20:00:14.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "barred galaxies",
      "merger-built bulges",
      "identify composite bulges",
      "central disk",
      "classical bulge"
    ],
    "tags": [
      "journal article"
    ],
    "publication": {
      "doi": "10.1051/0004-6361/201423955",
      "journal": "Astronomy and Astrophysics",
      "year": 2014,
      "month": "Dec",
      "volume": 572
    },
    "note": {
      "typesetting": "TeX",
      "pages": 20,
      "language": "en",
      "license": "arXiv",
      "status": "editable",
      "adsabs": "2014A&A...572A..25M"
    }
  }
}