Searches for millisecond pulsations in low-mass X-ray binaries, 2

Details Searches for millisecond pulsations in low-mass X-ray binaries, 2 Searches for millisecond pulsations in low-mass X-ray binaries, 2

Nov 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994apj...435..362v&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 435, no. 1, p. 362-371

Astronomy and Astrophysics

Astronomy

115

Neutron Stars, Orbit Calculation, Pulsed Radiation, Stellar Models, Stellar Oscillations, X Ray Astronomy, X Ray Binaries, Ginga Satellite, Mathematical Models, Nyquist Frequencies, Stellar Magnetic Fields, Stellar Mass, Stellar Rotation

Scientific paper

Coherent millisecond X-ray pulsations are expected from low-mass X-ray binaries (LMXBs), but remain undetected. Using the single-parameter Quadratic Coherence Recovery Technique (QCRT) to correct for unknown binary orbit motion, we have performed Fourier transform searches for coherent oscillations in all long, continuous segments of data obtained at 1 ms time resolution during Ginga observations of LMXB. We have searched the six known Z sources (GX 5-1, Cyg X-2, Sco X-1, GX 17+2, GX 340+0, and GX 349+2), seven of the 14 known atoll sources (GX 3+1. GX 9+1, GX 9+9, 1728-33. 1820-30, 1636-53 and 1608-52), the 'peculiar' source Cir X-1, and the high-mass binary Cyg X-3. We find no evidence for coherent pulsations in any of these sources, with 99% confidence limits on the pulsed fraction between 0.3% and 5.0% at frequencies below the Nyquist frequency of 512 Hz. A key assumption made in determining upper limits in previous searches is shown to be incorrect. We provide a recipe for correctly setting upper limits and detection thresholds. Finally we discuss and apply two strategies to improve sensitivity by utilizing multiple, independent, continuous segments of data with comparable count rates.

Affiliated with

Also associated with

No associations

Rating

Searches for millisecond pulsations in low-mass X-ray binaries, 2 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 Searches for millisecond pulsations in low-mass X-ray binaries, 2, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Searches for millisecond pulsations in low-mass X-ray binaries, 2 will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1021957