Abstract
Combined spectral-timing techniques are the key to understand the
variability, environment and internal composition of neutron-stars in
X-ray binary systems. We analyzed all the available RXTE observations of
the neutron-star low-mass X-ray binary 4U 1636-53 and studied the rms
fractional amplitude of its pair of kilohertz quasi-periodic
oscillations (QPOs) as a function of energy and frequency. By combining
the observations with the QPOs within chosen frequency ranges we
produced frequency-resolved fractional rms amplitude spectra. By
selecting light-curves in different energy bands we created
energy-resolved relations of the fractional rms amplitude vs. frequency
of the kHz QPOs. We also studied the relation between the frequency of
the kHz QPOs and the physical parameters that describe the energy
spectrum of 4U 1636-53. We obtained results that, for the first time,
show the connection between the spectral parameters and the dynamical
and radiative properties of the kHz QPOs. We discuss the implications of
our findings on our understanding of the mechanism that produces the kHz
QPOs. Our results demonstrate that a simultaneous description of the
time and energy domains is needed to reveal the origin of the kHz QPOs.
| Original language | English |
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| Publication status | Published - 1-Jul-2018 |
| Event | 42nd COSPAR Scientific Assembly. Held 14-22 July 2018, in Pasadena, California, USA - Pasadena, California, United States Duration: 14-Jul-2018 → 22-Jul-2018 |
Conference
| Conference | 42nd COSPAR Scientific Assembly. Held 14-22 July 2018, in Pasadena, California, USA |
|---|---|
| Country/Territory | United States |
| City | Pasadena, California |
| Period | 14/07/2018 → 22/07/2018 |