{
  "id": "1801.05497",
  "version": "v1",
  "published": "2018-01-16T22:19:55.000Z",
  "updated": "2018-01-16T22:19:55.000Z",
  "title": "Identification of the infrared counterpart of SGR 1935+2154 with the Hubble Space Telescope",
  "authors": [
    "Andrew J. Levan",
    "Chryssa Kouveliotou",
    "Andrew S. Fruchter"
  ],
  "comment": "7 pages, 3 figures, accepted for publication in ApJ",
  "categories": [
    "astro-ph.HE"
  ],
  "abstract": "We present deep Hubble Space Telescope observations of a new magnetar source, the soft gamma-repeater SGR 1935+2154, discovered by Swift. We obtained three epochs of observations: while the source was active in March 2015, during a quiescent period in August 2015, and during a further active phase in May 2016. Close to the center of the X-ray error region identified by Chandra we find a faint (F140W(AB)=25.3) source, which fades by a factor of ~2 over the course of 5 months between the first two epochs of observations, before rebrightening during the second active period. If this source is indeed the counterpart to SGR 1935+2154 then it is amongst the faintest yet located for a magnetar. Our observations are spaced over 1.3 years and enable us to place limits on the source velocity of $\\mu = (60 \\pm 40)$ km s$^{-1}$ kpc$^{-1}$; observations on timescales of a decade can hence probe proper motion limits smaller than the velocities observed for the majority of pulsars. The comparison of the optical/IR and X-ray lightcurves of the source suggests that emission in the two regimes is associated but not directly correlated, offering support for a magnetospheric versus a fallback disc origin.",
  "revisions": [
    {
      "version": "v1",
      "updated": "2018-01-16T22:19:55.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "infrared counterpart",
      "probe proper motion limits smaller",
      "deep hubble space telescope observations",
      "identification"
    ],
    "note": {
      "typesetting": "TeX",
      "pages": 7,
      "language": "en",
      "license": "arXiv",
      "status": "editable"
    }
  }
}