Astronomy and Astrophysics – Astrophysics
Scientific paper
2000-09-29
Mon.Not.Roy.Astron.Soc. 319 (2000) 205
Astronomy and Astrophysics
Astrophysics
MNRAS in press
Scientific paper
10.1046/j.1365-8711.2000.03845.x
We analysed the 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 30 percent 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 percent. The source could have been in a quiet phase of accretion with a constant X-ray luminosity and spin down rate.
Alpar Alan
Baykal Ahmet
Stark Michael James
Strohmayer T.,
Swank Jean
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