Resonance condition and low-frequency quasi-periodic oscillations of the outbursting source H1743-322

Sandip K. Chakrabarti, Santanu Mondal, Dipak Debnath

Research output: Contribution to journalArticlepeer-review

54 Scopus citations


It has long been proposed that low-frequency quasi-periodic oscillations (QPOs) in stellar-mass black holes or their equivalents in supermassive black holes are the result of resonances between infall and cooling timescales. We explicitly compute these two timescales in a generic situation to show that resonances are easily achieved. During an outburst of a transient black hole candidate, the accretion rate of the Keplerian disc as well as the geometry of the Comptonizing cloud change very rapidly. During some period, a resonance condition between the cooling timescale (predominantly by Comptonization) and the infall timescale of the Comptonizing cloud is roughly satisfied. This leads to low-frequency quasi-periodic oscillations (LFQPOs) of the Compton cloud and the consequent oscillation of hard X-rays. In this paper, we explicitly follow black hole candidate H1743-322 during its 2010 outburst. We compute the Compton cooling time and infall time over several days and show that QPOs take place when these two roughly agree within ~50 per cent, i.e., the resonance condition is generally satisfied. We also confirm that for the sharper LFQPOs (i.e. higher Q-factors) the ratio of the two timescales is very close to 1.

Original languageEnglish
Pages (from-to)3451-3456
Number of pages6
JournalMonthly Notices of the Royal Astronomical Society
Issue number4
StatePublished - 16 Jul 2015
Externally publishedYes


  • 322-X-rays: binaries
  • Accretion, accretion discs
  • Radiation: dynamics
  • Shock waves
  • Stars: black holes
  • Stars: individual: H1743

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science


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