UNSPECIFIED. (2005) High-speed, multicolour optical photometry of the anomalous X-ray pulsar 4U 0142+61 with ULTRACAM. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 363 (2). pp. 609-614. ISSN 0035-8711

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Abstract

We present high-speed, multicolour optical photometry of the anomalous X-ray pulsar 4U 0142+61, obtained with ULTRACAM on the 4.2-m William Herschel Telescope. We detect 4U 0142+61 at magnitudes of i' = 23.7 +/- 0.1, g' = 27.2 +/- 0.2 and u' > 25.8, consistent with the magnitudes found recently by Hulleman et al. and hence confirming their discovery of both a spectral break in the optical and a lack of long-term optical variability. We also confirm the earlier discovery of Kern & Martin that 4U 0142+61 shows optical pulsations with an identical period (similar to 8.7 s) to the X-ray pulsations. The rms pulsed fraction in our data is 29 +/- 8 per cent, 5-7 times greater than the 0.2-8 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 former lagging the latter by only 0.04 +/- 0.02 cycles. In conjunction with the constraints imposed by X-ray observations, the results presented here favour a magnetar interpretation for the anomalous X-ray pulsars.

Item Type:	Journal Article
Subjects:	Q Science > QB Astronomy
Journal or Publication Title:	MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
Publisher:	BLACKWELL PUBLISHING
ISSN:	0035-8711
Date:	21 October 2005
Volume:	363
Number:	2
Number of Pages:	6
Page Range:	pp. 609-614
Identification Number:	10.1111/j.1365-2966.2005.09465.x
Publication Status:	Published
URI:	http://wrap.warwick.ac.uk/id/eprint/34459

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