Search for the optical counterpart to SGR 0418+5729
arXiv:1108.3340 · doi:10.1088/0004-637X/742/2/77
Abstract
We report broad-band Hubble Space Telescope imaging of the field of soft gamma-ray repeater SGR 0418+5729 with ACS/WFC and WFC3/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 mF606W>28.6, mF110W>27.4 (Vega system), equivalent to reddening-corrected luminosity limits LF606W<5e28, LF110W<6e28 erg s-1 for a distance d=2 kpc, at 3sig confidence. This, in turn, imposes lower limits on the contemporaneous X-ray/optical flux ratio of 1100 and X-ray/near-infra-red 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.
Accepted for publication in ApJ
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- Magnetars: the physics behind observations
- The outburst decay of the low magnetic field magnetar SGR 0418+5729
- SGRs and AXPs as rotation powered massive white dwarfs
- Pulsars and magnetars
- Low-magnetic-field magnetars
- SGR 0418+5729, Swift J1822.3-1606, and 1E 2259+586 as massive fast rotating highly magnetized white dwarfs
- Soft gamma-ray repeaters and anomalous X-ray pulsars as highly magnetized white dwarfs
- Identification of the infrared counterpart of SGR 1935+2154 with the Hubble Space Telescope
- New candidates for magnetar counterparts from a deep search with the Hubble Space Telescope
- 4XMM J175136.8-275858: A New Magnetar Candidate?