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High-speed, multicolour optical photometry of the anomalous X-ray pulsar 4U 0142+61 with ULTRACAM
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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. doi:10.1111/j.1365-2966.2005.09465.x ISSN 0035-8711.
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Official URL: http://dx.doi.org/10.1111/j.1365-2966.2005.09465.x
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 | ||||
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Subjects: | Q Science > QB Astronomy | ||||
Journal or Publication Title: | MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY | ||||
Publisher: | BLACKWELL PUBLISHING | ||||
ISSN: | 0035-8711 | ||||
Official Date: | 21 October 2005 | ||||
Dates: |
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Volume: | 363 | ||||
Number: | 2 | ||||
Number of Pages: | 6 | ||||
Page Range: | pp. 609-614 | ||||
DOI: | 10.1111/j.1365-2966.2005.09465.x | ||||
Publication Status: | Published |
Data sourced from Thomson Reuters' Web of Knowledge
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