{
  "id": "1801.07072",
  "version": "v1",
  "published": "2018-01-22T12:55:43.000Z",
  "updated": "2018-01-22T12:55:43.000Z",
  "title": "Cospatial Star Formation and Supermassive Black Hole Growth in $z \\sim 3$ Galaxies: Evidence for In-situ Co-evolution",
  "authors": [
    "W. Rujopakarn",
    "K. Nyland",
    "G. H. Rieke",
    "G. Barro",
    "D. Elbaz",
    "R. J. Ivison",
    "P. Jagannathan",
    "J. D. Silverman",
    "V. Smolcic",
    "T. Wang"
  ],
  "comment": "7 pages, 3 figures, 2 tables. Accepted for publication in the Astrophysical Journal Letters",
  "categories": [
    "astro-ph.GA",
    "astro-ph.CO"
  ],
  "abstract": "We present a sub-kpc localization of the sites of supermassive black hole (SMBH) growth in three active galactic nuclei (AGN) at $z \\sim 3$ in relation to the regions of intense star formation in their hosts. These AGNs are selected from Karl G. Jansky Very Large Array (VLA) and Atacama Large Millimeter/submillimeter Array (ALMA) observations in the HUDF and COSMOS, with the centimetric radio emission tracing both star formation and AGN, and the sub/millimeter emission by dust tracing nearly pure star formation. We require radio emission to be $\\geqslant5\\times$ more luminous than the level associated with the sub/millimeter star formation to ensure that the radio emission is AGN-dominated, thereby allowing localization of the AGN and star formation independently. In all three galaxies, the AGN are located within the compact regions of gas-rich, heavily obscured, intense nuclear star formation, with $R_e = 0.4-1.1$ kpc and average star formation rates of $\\simeq100-1200$ $M_\\odot$yr$^{-1}$. If the current episode of star formation continues at such a rate over the stellar mass doubling time of their hosts, $\\simeq 0.2$ Gyr, the newly formed stellar mass will be of the order of $10^{11}$ $M_\\odot$ within the central kpc region, concurrently and cospatially with significant growth of the SMBH. This is consistent with a picture of in-situ galactic bulge and SMBH formation. This work demonstrates the unique complementarity of VLA and ALMA observations to unambiguously pinpoint the locations of AGN and star formation down to $\\simeq30$ mas, corresponding to $\\simeq 230$ pc at $z = 3$.",
  "revisions": [
    {
      "version": "v1",
      "updated": "2018-01-22T12:55:43.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "supermassive black hole growth",
      "cospatial star formation",
      "in-situ co-evolution",
      "radio emission",
      "average star formation rates"
    ],
    "note": {
      "typesetting": "TeX",
      "pages": 7,
      "language": "en",
      "license": "arXiv",
      "status": "editable"
    }
  }
}