Astronomy and Astrophysics – Astrophysics
Scientific paper
2008-10-29
2009, MNRAS, 393, 139
Astronomy and Astrophysics
Astrophysics
19 pages, 16 figures, 3 tables, accepted for publication in MNRAS
Scientific paper
10.1111/j.1365-2966.2008.14167.x
We present the results of a study with the \emph{Swift} Burst Alert Telescope in the 14 -- 195 keV range of the long-term variability of 5 low mass X-ray binaries with reported or suspected super-orbital periods -- 4U 1636-536, 4U 1820-303, 4U 1916-053, Cyg X-2 and Sco X-1. No significant persistent periodic modulation was detected around the previously reported periods in the 4U 1916-053, Cyg X-2 or Sco X-1 light curves. The $\sim$170 d period of 4U 1820-303 was detected up to 24 keV, consistent with variable accretion due to the previously proposed triple system model. The $\sim$46 d period in 4U 1636-536 was detected up to 100 keV, with the modulation in the low and high energy bands found to be phase shifted by $\sim180^\circ$ with respect to each other. This phase shift, when taken together with the near-coincident onset of the $\sim$46 d modulation and the low/hard X-ray state, leads us to speculate that the modulation could herald transient jet formation.
Barret Dider
Farrell Sean A.
Skinner Gerald K.
No associations
LandOfFree
Super-Orbital Variability in Hard X-rays does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Super-Orbital Variability in Hard X-rays, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Super-Orbital Variability in Hard X-rays will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-72468