Bibcode
Dhillon, V. S.; Marsh, T. R.; Littlefair, S. P.; Copperwheat, C. M.; Kerry, P.; Dib, R.; Durant, M.; Kaspi, V. M.; Mignani, R. P.; Shearer, A.
Referencia bibliográfica
Monthly Notices of the Royal Astronomical Society: Letters, Volume 394, Issue 1, pp. L112-L116.
Fecha de publicación:
3
2009
Número de citas
28
Número de citas referidas
20
Descripción
We present high-speed optical photometry of the anomalous X-ray pulsar
1E1048.1-5937 obtained with ULTRACAM on the 8.2-m Very Large Telescope
in 2007 June. We detect 1E1048.1-5937 at a magnitude of i' = 25.3 +/-
0.2, consistent with the values found by Wang et al. and hence
confirming their conclusion that the source was approximately 1mag
brighter than in 2003-06 due to an on-going X-ray flare that started in
2007 March. The increased source brightness enabled us to detect optical
pulsations with an identical period (6.458s) to the X-ray pulsations.
The root-mean-square (rms) pulsed fraction in our data is 21 +/- 7 per
cent, approximately the same as the 2-10keV 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
1E1048.1-5937 are very similar in nature to those observed in 4U0142+61.
The implications of our observations for models of anomalous X-ray
pulsars are discussed.
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