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High-speed, multicolour optical photometry of the anomalous X-ray pulsar 4U 0142+61 with ULTRACAM
| Content Provider | Paperity |
|---|---|
| Author | Marsh, T. R. Hulleman, F. Littlefair, S. P. Gavriil, F. P. Kaspi, V. M. Dhillon, V. S. Kerkwijk, M. H. Van Shearer, A. |
| 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 (∼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. |
| Starting Page | 609 |
| Ending Page | 614 |
| File Format | HTM / HTML |
| ISSN | 00358711 |
| DOI | 10.1111/j.1365-2966.2005.09465.x |
| Issue Number | 2 |
| Journal | Monthly Notices of the Royal Astronomical Society |
| Volume Number | 363 |
| e-ISSN | 13652966 |
| Language | English |
| Publisher | Oxford University Press |
| Publisher Date | 2005-10-21 |
| Access Restriction | Open |
| Subject Keyword | Stars: neutron Pulsars: individual: 4u 0142+61 |
| Content Type | Text |
| Resource Type | Article |
| Subject | Astronomy and Astrophysics Space and Planetary Science |
