Discovery of a Second Kilohertz QPO in the X-ray Binary 4U 1735-44
Abstract
In recent observations with the Rossi X-Ray Timing Explorer we have detected two simultaneous quasi-periodic oscillation (QPO) peaks in the low mass X-ray binary and atoll source 4U 1735-44. The lower and higher frequency QPOs have frequencies varying between 632 and 729 Hz, and 982 and 1026 Hz, respectively. The fractional rms amplitudes are 3.7 to 8.1% and 5.0 to 5.8%. The frequency separation between the two QPOs changes from 341+-7 Hz to 296+-12 Hz. The inferred mass accretion rate during our observations is relatively low compared to that during the previous observations, where only a single QPO was present. There is weak evidence that the frequency of the QPOs correlates with the mass accretion rate, as observed in other binaries. Five X-ray bursts were recorded with no detectable oscillations with upper limits for the rms fraction of 4% to 13%.
Cite
@article{arxiv.astro-ph/9809407,
title = {Discovery of a Second Kilohertz QPO in the X-ray Binary 4U 1735-44},
author = {Eric C. Ford and Michiel van der Klis and Jan van Paradijs and Mariano Mendez and Rudy Wijnands and Philip Kaaret},
journal= {arXiv preprint arXiv:astro-ph/9809407},
year = {2009}
}
Comments
accepted by ApJ Letters, for more information see the QPO page at http://www.astro.uva.nl/ecford/qpos.html