{
  "id": "1907.12132",
  "version": "v1",
  "published": "2019-07-28T19:48:00.000Z",
  "updated": "2019-07-28T19:48:00.000Z",
  "title": "Impact of $1/f$ noise on cosmological parameter constraints for SKA intensity mapping",
  "authors": [
    "T. Chen",
    "R. A. Battye",
    "A. A. Costa",
    "C. Dickinson",
    "S. E. Harper"
  ],
  "comment": "15 pages, 8 figures, submitted to MNRAS",
  "categories": [
    "astro-ph.CO"
  ],
  "abstract": "We investigate the impact of $1/f$ noise on cosmology for an intensity mapping survey with SKA1-MID Band\\,1 and Band\\,2. We use a Fisher matrix approach to forecast constraints on cosmological parameters under the influence of $1/f$ noise, adopting a semi-empirical model from an earlier work, which results from the residual $1/f$ noise spectrum after applying a component separation algorithm to remove smooth spectral components. Without $1/f$ noise, the projected constraints are $4\\%$ on $w_0$, $1\\%$ on $h$, $2\\%$ on $b_{\\rm HI}$ using Band\\,1+\\emph{Planck}, and $3\\%$ on $w_0$, $0.5\\%$ on $h$, $2\\%$ on $b_{\\rm HI}$ using Band\\,2+\\emph{Planck}. A representative baseline $1/f$ noise degrades these constraints by a factor of $\\sim1.5$ for Band\\,1+\\emph{Planck}, and $\\sim1.2$ for Band\\,2+\\emph{Planck}. On the power spectrum measurement, higher redshift and smaller scales are more affected by $1/f$ noise, with minimal contamination comes from $z\\lesssim1$ and $\\ell\\lesssim100$. Subject to the specific scan strategy of the adopted $1/f$ noise model, one prefers a correlated in frequency with minimised spectral slope, a low knee frequency, and a large telescope slew speed in order to reduce its impact.",
  "revisions": [
    {
      "version": "v1",
      "updated": "2019-07-28T19:48:00.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "cosmological parameter constraints",
      "ska intensity mapping",
      "remove smooth spectral components",
      "low knee frequency",
      "fisher matrix approach"
    ],
    "note": {
      "typesetting": "TeX",
      "pages": 15,
      "language": "en",
      "license": "arXiv",
      "status": "editable"
    }
  }
}