Search for the optical counterpart to SGR 0418+5729

Martin Durant, Oleg Kargaltsev, George G. Pavlov

Research output: Contribution to journalArticle

11 Citations (Scopus)

Abstract

We report broadband Hubble Space Telescope imaging of the field of soft γ-ray repeater SGR 0418+5729 with Advanced Camera for Surveys/Wide Field Channel and Wide Field Camera 3/IR. Observing in two wide filters, F606W and F110W, we find no counterpart within the positional error circle derived from Chandra observations, to limiting magnitudes m F606W > 28.6 and m F110W > 27.4 (Vega system), equivalent to reddening-corrected luminosity limits L F606W < 5 × 1028 and L F110W < 6 × 1028ergs-1 for a distance d = 2kpc, at 3σ confidence. This, in turn, imposes lower limits on the contemporaneous X-ray/optical flux ratio of ≃1100 and the X-ray/near-infrared flux ratio of ≃1000. We derive an upper limit on the temperature and/or size of any fall-back disk around the magnetar. We also compare the detection limits with observations of other magnetars.

Original languageEnglish (US)
Article number77
JournalAstrophysical Journal
Volume742
Issue number2
DOIs
StatePublished - Dec 1 2011

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magnetars
near infrared
cameras
filter
repeaters
Hubble Space Telescope
confidence
rays
x rays
temperature
luminosity
broadband
filters
detection

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science

Cite this

Durant, Martin ; Kargaltsev, Oleg ; Pavlov, George G. / Search for the optical counterpart to SGR 0418+5729. In: Astrophysical Journal. 2011 ; Vol. 742, No. 2.
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Search for the optical counterpart to SGR 0418+5729. / Durant, Martin; Kargaltsev, Oleg; Pavlov, George G.

In: Astrophysical Journal, Vol. 742, No. 2, 77, 01.12.2011.

Research output: Contribution to journalArticle

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