{
  "id": "1910.14017",
  "version": "v1",
  "published": "2019-10-30T17:55:35.000Z",
  "updated": "2019-10-30T17:55:35.000Z",
  "title": "Evidence for Non-smooth Quenching in Massive Galaxies at $z\\sim1$",
  "authors": [
    "Timothy Carleton",
    "Yicheng Guo",
    "Hooshang Nayyeri",
    "Michael Cooper",
    "Gregory Rudnick",
    "Katherine Whitaker"
  ],
  "comment": "Submitted to MNRAS after revision. Comments welcome!",
  "categories": [
    "astro-ph.GA"
  ],
  "abstract": "We investigate a large sample of massive galaxies at $z\\sim1$ with combined $HST$ broad-band and grism observations to constrain the star-formation histories of these systems as they transition from a star-forming state to quiescence. Among our sample of massive $(M_*>10^{10}~{\\rm M_\\odot})$ galaxies at $0.7<z<1.2$, dust-corrected H$\\alpha$ and UV star-formation indicators agree with a small dispersion ($\\sim0.2$~dex) for galaxies on the main sequence, but diverge and exhibit substantial scatter ($\\sim0.7$~dex) once they drop significantly below the star-forming main sequence. Significant H$\\alpha$ emission is present in galaxies with low dust-corrected UV SFR values as well as galaxies classified as quiescent using the $UVJ$ diagram. We compare the observed H$\\alpha$ flux distribution to the expected distribution assuming bursty or smooth star-formation histories, and find that massive galaxies at $z\\sim1$ are most consistent with a quick, bursty quenching process. This suggests that mechanisms such as feedback, stochastic gas flows, and minor mergers continue to induce low-level bursty star formation in massive galaxies at moderate redshift, even as they quench.",
  "revisions": [
    {
      "version": "v1",
      "updated": "2019-10-30T17:55:35.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "massive galaxies",
      "non-smooth quenching",
      "induce low-level bursty star formation",
      "star-formation histories",
      "low dust-corrected uv sfr values"
    ],
    "note": {
      "typesetting": "TeX",
      "pages": 0,
      "language": "en",
      "license": "arXiv",
      "status": "editable"
    }
  }
}