Differences between the two anomalous X-ray pulsars: variations in the spin-down rate of 1E 1048.1-5937 and an extended interval of quiet spin-down in 1E 2259+586

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2000-11-21

Author

Baykal, Altan
Swank, J
Alpar, MA
Stark, MJ

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We analysed the Rossi X-ray Timing Explorer (RXTE) archival data of 1E 1048.1-5937 covering a time-span of more than one year. The spin-down rate of this source decreases by similar to 30 per cent during the observation. We could not resolve the X-ray flux variations because of contamination by eta Carinae. We find that the level of pulse frequency fluctuations of 1E 1048.1-5937 is consistent with typical noise levels of accretion-powered pulsars. Recent RXTE observations of 1E 2259+586 have shown a constant spin-down with a very low upper limit on timing noise. We used the RXTE archival X-ray observations of 1E 2259+586 to show that the intrinsic X-ray luminosity times-series is also stable, with an rms fractional variation of less than 15 per cent. The source could have been in a quiet phase of accretion with a constant X-ray luminosity and spin-down rate.

Subject Keywords

Accretion, Low Mass X-Ray Binaries, Magnetars, 1E

URI

https://hdl.handle.net/11511/38456

Journal

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY

DOI

https://doi.org/10.1046/j.1365-8711.2000.03845.x

Collections

Department of Physics, Article

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Citation Formats

A. Baykal, J. Swank, M. Alpar, and M. Stark, “Differences between the two anomalous X-ray pulsars: variations in the spin-down rate of 1E 1048.1-5937 and an extended interval of quiet spin-down in 1E 2259+586,” MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, pp. 205–208, 2000, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/38456.