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Phase lags of quasi-periodic oscillations across source states in the low-mass X-ray binary 4U 1636–53

Phase lags of quasi-periodic oscillations across source states in the low-mass X-ray binary 4U 1636–53
Phase lags of quasi-periodic oscillations across source states in the low-mass X-ray binary 4U 1636–53
While there are many dynamical mechanisms and models that try to explain the origin and phenomenology of the quasi-periodic oscillations (QPOs) seen in the X-ray light curves of low-mass X-ray binaries, few of them address how the radiative processes occurring in these extreme environments give rise to the rich set of variability features actually observed in these light curves. A step towards this end comes from the study of the energy and frequency dependence of the phase lags of these QPOs. Here we used a methodology that allowed us to study, for the first time, the dependence of the phase lags of all QPOs in the range of 1–1300 Hz detected in the low-mass X-ray binary 4U 1636–53 upon energy and frequency as the source changes its states as it moves through the colour–colour diagram. Our results suggest that within the context of models of up-scattering Comptonization, the phase lags dependences upon frequency and energy can be used to extract size scales and physical conditions of the medium that produces the lags.
0035-8711
79-92
de Avellar, Marcio G.B.
a1f8787c-f188-4047-84b1-6c2f4874ab03
Méndez, Mariano
5cc6f759-dae2-488a-9cc2-cff89f4eca72
Altamirano, Diego
d5ccdb09-0b71-4303-9538-05b467be075b
Sanna, Andrea
2c05dccc-d674-4ca7-b324-730eb73d6a36
Zhang, Guobao
4b081922-0f52-4a4d-8d51-dea291211180
de Avellar, Marcio G.B.
a1f8787c-f188-4047-84b1-6c2f4874ab03
Méndez, Mariano
5cc6f759-dae2-488a-9cc2-cff89f4eca72
Altamirano, Diego
d5ccdb09-0b71-4303-9538-05b467be075b
Sanna, Andrea
2c05dccc-d674-4ca7-b324-730eb73d6a36
Zhang, Guobao
4b081922-0f52-4a4d-8d51-dea291211180

de Avellar, Marcio G.B., Méndez, Mariano, Altamirano, Diego, Sanna, Andrea and Zhang, Guobao (2016) Phase lags of quasi-periodic oscillations across source states in the low-mass X-ray binary 4U 1636–53. Monthly Notices of the Royal Astronomical Society, 461 (1), 79-92. (doi:10.1093/mnras/stw1271).

Record type: Article

Abstract

While there are many dynamical mechanisms and models that try to explain the origin and phenomenology of the quasi-periodic oscillations (QPOs) seen in the X-ray light curves of low-mass X-ray binaries, few of them address how the radiative processes occurring in these extreme environments give rise to the rich set of variability features actually observed in these light curves. A step towards this end comes from the study of the energy and frequency dependence of the phase lags of these QPOs. Here we used a methodology that allowed us to study, for the first time, the dependence of the phase lags of all QPOs in the range of 1–1300 Hz detected in the low-mass X-ray binary 4U 1636–53 upon energy and frequency as the source changes its states as it moves through the colour–colour diagram. Our results suggest that within the context of models of up-scattering Comptonization, the phase lags dependences upon frequency and energy can be used to extract size scales and physical conditions of the medium that produces the lags.

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Accepted/In Press date: 25 May 2016
e-pub ahead of print date: 27 May 2016
Published date: September 2016
Organisations: Astronomy Group

Identifiers

Local EPrints ID: 401756
URI: http://eprints.soton.ac.uk/id/eprint/401756
ISSN: 0035-8711
PURE UUID: bdc07981-6173-496d-ba70-df09ea15250e
ORCID for Diego Altamirano: ORCID iD orcid.org/0000-0002-3422-0074

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Date deposited: 21 Oct 2016 10:26
Last modified: 17 Dec 2019 01:35

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