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dc.contributor.authorShearer, Andrewen
dc.date.accessioned2011-03-10T17:00:53Zen
dc.date.available2011-03-10T17:00:53Zen
dc.date.issued2009en
dc.identifier.citationV. S. Dhillon, T. R. Marsh, S. P. Littlefair, C. M. Copperwheat, P. Kerry, R. ...(2009)Optical pulsations from the anomalous X-ray pulsar 1E 1048.1-5937,en
dc.identifier.urihttp://hdl.handle.net/10379/1740en
dc.description.abstractWe present high-speed optical photometry of the anomalous X-ray pulsar 1E 1048.1-5937 obtained with ULTRACAM on the 8.2-m Very Large Telescope in June 2007. We detect 1E 1048.1-5937 at a magnitude of i'=25.3+/-0.2, consistent with the values found by Wang et al. (2008) and hence confirming their conclusion that the source was approximately 1 mag brighter than in 2003-2006 due to an on-going X-ray flare that started in March 2007. The increased source brightness enabled us to detect optical pulsations with an identical period (6.458 s) to the X-ray pulsations. The rms pulsed fraction in our data is 21+/-7%, approximately the same as the 2-10 keV X-ray rms pulsed fraction. The optical and X-ray pulse profiles show similar morphologies and appear to be approximately in phase with each other, the latter lagging the former by only 0.06+/-0.02 cycles. The optical pulsations in 1E 1048.1-5937 are very similar in nature to those observed in 4U 0142+61. The implications of our observations for models of anomalous X-ray pulsars are discussed.en
dc.formatapplication/pdfen
dc.language.isoenen
dc.subjectAstrophysics - High Energy Astrophysical Phenomenaen
dc.titleOptical pulsations from the anomalous X-ray pulsar 1E 1048.1-5937en
dc.typeArticleen
dc.local.publishedsourcehttp://arxiv.org/pdf/0901.1559en
dc.description.peer-reviewedpeer-revieweden
dc.local.authorsV. S. Dhillon, T. R. Marsh, S. P. Littlefair, C. M. Copperwheat, P. Kerry, R. Dib, M. Durant, V. M. Kaspi, R. P. Mignani, A. Sheareren
dc.local.arxivid0901.1559en
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