| Name: | SUCHISMITO CHATTOPADHYAY |
| Affiliation: | Government Girls' General Degree College |
| Conference ID : | ASI2023_349 |
| Title : | Study of the kHz QPO properties in the 4U 1636-53,4U 1820-30, 4U 0614+091, 4U 1728-34. |
| Authors : | Suchismito Chattopadhyay, Soma Mandal, Ranjeev Misra |
| Mode of Presentation: | Poster |
| Abstract Category : | Stars, ISM and Galaxy |
| Abstract : | We present the systematic analysis of the energy-dependent time lags and rms fractional amplitude of the kilohertz quasi-periodic oscillations (kHz QPOs) of neutron-star low-mass X-ray binaries 4U 1636-536, 4U 1820-30, 4U 0614+091 and 4U 1728-34 using AstroSat’s LAXPC data. We observed that for the upper kHz QPO the slope of the best-fitting linear model to the time-lag vs frequency variation is more or less consistent with the zero and the total rms amplitude integrated over the 3–10 keV energy band decreases with the increasing frequency of the kHz QPO. Furthermore, We also see a linear correlation between the variation of the quality factor with that of the rms amplitude variation. Finally, from the observed alternating variability trend in the time-lag and increasing fractional rms amplitude with the increasing energy in individual sources. we discuss the mechanism that could be responsible for the radiative properties of the kHz QPOs.
|
