{
  "id": "1801.03858",
  "version": "v1",
  "published": "2018-01-11T16:39:19.000Z",
  "updated": "2018-01-11T16:39:19.000Z",
  "title": "X-ray time lags in PG 1211+143",
  "authors": [
    "Andrew Lobban",
    "Simon Vaughan",
    "Ken Pounds",
    "James Reeves"
  ],
  "comment": "Accepted for publication in MNRAS; 10 pages, 7 figures, 1 table",
  "categories": [
    "astro-ph.HE"
  ],
  "abstract": "We investigate the X-ray time lags of a recent ~630ks XMM-Newton observation of PG 1211+143. We find well-correlated variations across the XMM-Newton EPIC bandpass, with the first detection of a hard lag in this source with a mean time delay of up to ~3ks at the lowest frequencies. We find that the energy-dependence of the low-frequency hard lag scales approximately linearly with log(E) when averaged over all orbits, consistent with the propagating fluctuations model. However, we find that the low-frequency lag behaviour becomes more complex on timescales longer than a single orbit, suggestive of additional modes of variability. We also detect a high-frequency soft lag at ~10^{-4}Hz with the magnitude of the delay peaking at <0.8ks, consistent with previous observations, which we discuss in terms of small-scale reverberation.",
  "revisions": [
    {
      "version": "v1",
      "updated": "2018-01-11T16:39:19.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "x-ray time lags",
      "low-frequency hard lag scales",
      "mean time delay",
      "xmm-newton epic bandpass",
      "low-frequency lag behaviour"
    ],
    "note": {
      "typesetting": "TeX",
      "pages": 10,
      "language": "en",
      "license": "arXiv",
      "status": "editable"
    }
  }
}