{
  "id": "1805.05063",
  "version": "v1",
  "published": "2018-05-14T08:40:22.000Z",
  "updated": "2018-05-14T08:40:22.000Z",
  "title": "The clustering of galaxies with pseudo bulge and classical bulge in the local Universe",
  "authors": [
    "Lan Wang",
    "Lixin Wang",
    "Cheng Li",
    "Jian Hu",
    "Houjun Mo",
    "Huiyuan Wang"
  ],
  "comment": "12 pages, 11 figures, submitted to MNRAS",
  "categories": [
    "astro-ph.GA"
  ],
  "abstract": "We investigate the clustering properties and close neighbour counts for galaxies with different types of bulges and stellar masses. We select samples of \"classical\" and \"pseudo\" bulges, as well as \"bulge-less\" disk galaxies, based on the bulge/disk decomposition catalog of SDSS galaxies provided by Simard et al. (2011). For a given galaxy sample we estimate: the projected two-point cross-correlation function with respect to a spectroscopic reference sample, w_p(r_p), and the average background-subtracted neighbour count within a projected separation using a photometric reference sample, N_neighbour(<r_p). We compare the results with the measurements of control samples matched in color, concentration and redshift. We find that, when limited to a certain stellar mass range and matched in color and concentration, all the samples present similar clustering amplitudes and neighbour counts on scales above ~0.1h^{-1}Mpc. This indicates that neither the presence of a central bulge, nor the bulge type is related to intermediate-to-large scale environments. On smaller scales, in contrast, pseudo-bulge and pure-disk galaxies similarly show strong excess in close neighbour count when compared to control galaxies, at all masses probed. For classical bulges, small-scale excess is also observed but only for M_stars < 10^{10} M_sun; at higher masses, their neighbour counts are similar to that of control galaxies at all scales. These results imply strong connections between galactic bulges and galaxy-galaxy interactions in the local Universe, although it is unclear how they are physically linked in the current theory of galaxy formation.",
  "revisions": [
    {
      "version": "v1",
      "updated": "2018-05-14T08:40:22.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "local universe",
      "classical bulge",
      "pseudo bulge",
      "close neighbour count",
      "clustering"
    ],
    "note": {
      "typesetting": "TeX",
      "pages": 12,
      "language": "en",
      "license": "arXiv",
      "status": "editable"
    }
  }
}