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- · arXiv e-print (arXiv:1106.1355)
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| Title: |
| The first observation of optical pulsations from a soft gamma repeater: SGR 0501+4516 |
| Authors: |
| Dhillon, V. S.; Marsh, T. R.; Littlefair, S. P.; Copperwheat, C. M.; Hickman, R. D. G.; Kerry, P.; Levan, A. J.; Rea, N.;Savoury, C. D. J.; Tanvir, N. R.; Turolla, R.; Wiersema, K. |
| Publication: |
| eprint arXiv:1106.1355 |
| Publication Date: |
| 06/2011 |
| Origin: |
| ARXIV |
| Keywords: |
| Astrophysics - Solar and Stellar Astrophysics |
| Comment: |
| 5 pages, 3 figures, accepted for publication in MNRAS Letters |
| Bibliographic Code: |
| 2011arXiv1106.1355D |
Abstract
We present high-speed optical photometry of the soft gamma repeater SGR 0501+4516, obtained with ULTRACAM on two consecutive nights approximately 4 months after the source was discovered via its gamma-ray bursts. We detect SGR 0501+4516 at a magnitude of i' = 24.4+/-0.1. We present the first measurement of optical pulsations from an SGR, deriving a period of 5.7622+/-0.0003 s, in excellent agreement with the X-ray spin period of the neutron star. We compare the morphologies of the optical pulse profile with the X-ray and infrared pulse profiles; we find that the optical, infrared and harder X-rays share similar double-peaked morphologies, but the softer X-rays exhibit only a single-peaked morphology, indicative of a different origin. The optical pulsations appear to be in phase with the X-ray pulsations and exhibit a root-mean-square pulsed fraction of 52+/-7%, approximately a factor of two greater than in the X-rays. Our results find a natural explanation within the context of the magnetar model for SGRs.
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