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

Autor(es)

de Avellar, Marcio G. B. ; Mendez, Mariano ; Altamirano, Diego ; Sanna, Andrea ; Zhang, Guobao

• Tipo de documento: Artigo Científico
• Fonte: Monthly Notices of the Royal Astronomical Society; v. 461, n. 1, p. 79-92, SEP 1 2016.
• Citações Web of Science: 7

Resumo

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. (AU)

• Processo FAPESP: 13/26258-4 - Matéria superdensa no universo
• Beneficiário: Manuel Máximo Bastos Malheiro de Oliveira
• Modalidade de apoio: Auxílio à Pesquisa - Temático
• Processo FAPESP: 11/23996-9 - Estrelas compactas em binárias: investigando a composição da matéria superdensa
• Beneficiário: Marcio Guilherme Bronzato de Avellar
• Modalidade de apoio: Bolsas no Brasil - Pós-Doutorado