Upper-twin-peak quasiperiodic oscillation in x-ray binaries and the energy from tidal circularization of relativistic orbits
| Autor: | C. Germanà |
|---|---|
| Rok vydání: | 2017 |
| Předmět: |
High Energy Astrophysical Phenomena (astro-ph.HE)
Physics 010308 nuclear & particles physics Oscillation Astrophysics::High Energy Astrophysical Phenomena FOS: Physical sciences Astronomy Astrophysics 01 natural sciences Gravitation Orbit Neutron star Amplitude 0103 physical sciences Tidal force Astrophysics::Earth and Planetary Astrophysics Astrophysics - High Energy Astrophysical Phenomena Tidal circularization Low Mass 010303 astronomy & astrophysics Astrophysics::Galaxy Astrophysics |
| Zdroj: | Physical Review D. 96 |
| ISSN: | 2470-0029 2470-0010 |
| DOI: | 10.1103/physrevd.96.103015 |
| Popis: | High frequency quasiperiodic oscillations (HF QPOs) detected in the power spectra of low mass x-ray binaries (LMXBs) could unveil the fingerprints of gravitation in strong field regime. Using the energy-momentum relation we calculate the energy a clump of plasma orbiting in the accretion disk releases during circularization of its slightly eccentric relativistic orbit. Following previous works, we highlight the strong tidal force as mechanism to dissipate such energy. We show that tides acting on the clump are able to reproduce the observed coherence of the upper HF QPO seen in LMXBs with a neutron star (NS). The quantity of energy released by the clump and relativistic boosting might give a modulation amplitude in agreement with that observed in the upper HF QPO. Both the amplitude and coherence of the upper HF QPO in NS LMXBs could allow us to disclose, for the first time, the tidal circularization of relativistic orbits occurring around a neutron star. Comment: 13 pages, 5 figures. Accepted for publication in Physical Review D |
| Databáze: | OpenAIRE |
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