1998/09/30 by Eric C. Ford, Michiel van der Klis, Jan van Paradijs +4 · 3 citations
Physics and Astronomy · #Accretion (finance) #Accretion disc #Amplitude #Astrophysical Phenomena and Observations #Astrophysics and Star Formation Studies #Binary number #Binary star #Gamma-ray bursts and supernovae #Low Mass #Oscillation (cell signaling) #X-ray binary #astro-ph
paper · pdf · doi:10.1086/311745
accepted by ApJ Letters, for more information see the QPO page at http://www.astro.uva.nl/ecford/qpos.html
arxiv created 1998/09/30 · openalex publication_date 1998/12/01 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
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%-8.1% and 5.0%-5.8%. The frequency separation between the two QPOs changes from 341±7 to 296±12 Hz. The inferred mass accretion rate during our observations is relatively low compared to that during the previous observations, in which 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%-13%.