{
  "id": "2308.15586",
  "version": "v1",
  "published": "2023-08-29T19:31:08.000Z",
  "updated": "2023-08-29T19:31:08.000Z",
  "title": "Improved Redshifts for DESI EDR Quasars",
  "authors": [
    "Qiaoya Wu",
    "Yue Shen"
  ],
  "comment": "3 pages, 1 figure. Submitted to RNAAS, comments welcome!",
  "categories": [
    "astro-ph.GA",
    "astro-ph.CO"
  ],
  "abstract": "The Dark Energy Spectroscopic Instrument (DESI) survey will provide optical spectra for $\\sim 3$ million quasars. Accurate redshifts for these quasars will facilitate a broad range of science applications. Here we provide improved systemic redshift estimates for the $\\sim 95$k quasars included in the DESI Early Data Release (EDR), based on emission-line fits to the quasar spectra. The majority of the DESI pipeline redshifts are reliable. However, $\\sim 19\\%$ of the EDR quasars have pipeline redshifts that deviate from our new redshifts by $>500\\,{\\rm km\\,s^{-1}}$. We use composite quasar spectra to demonstrate the improvement of our redshift estimates, particularly at $z>1$. These new redshifts are available at \\url{https://github.com/QiaoyaWu/DESI_EDR_qsofit/blob/main/DESI_EDR_Aug29_redshift_only.fits}.",
  "revisions": [
    {
      "version": "v1",
      "updated": "2023-08-29T19:31:08.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "desi edr quasars",
      "dark energy spectroscopic instrument",
      "desi pipeline redshifts",
      "composite quasar spectra",
      "systemic redshift estimates"
    ],
    "note": {
      "typesetting": "TeX",
      "pages": 3,
      "language": "en",
      "license": "arXiv",
      "status": "editable"
    }
  }
}