| Name: | Hitesh Tanenia |
| Affiliation: | JAMIA MILLIA ISLAMIA (JMI) |
| Conference ID : | ASI2024_307 |
| Title : | Modelling the Energy-dependent temporal behavior of black-hole X-ray binary GX 339-4 as observed by NICER and Astrosat |
| Authors : | Hitesh Tanenia, Akash Garg, Ranjeev Misra, Somasri Sen |
| Authors Affiliation: | Hitesh Tanenia, Somasri Sen (Department of Physics, Jamia Millia Islamia, Jamia Nagar, New Delhi-110025, India)
Akash Garg, Ranjeev Misra (Inter-University Centre for Astronomy and Astrophysics, Ganeshkhind, Pune-411007, India) |
| Mode of Presentation: | Poster |
| Abstract Category : | High Energy Phenomena, Fundamental Physics and Astronomy |
| Abstract : | In our work, we performed the spectro-timing analysis of the black hole X-ray transient GX 339-4, using simultaneous observations of Astrosat and NICER during its 2021 outburst. The broadband spectral analysis confirmed the source to be in a low/hard state with a spectral index of 1.57. The combined spectra of Asrosat and NICER have been fitted successfully using the appropriate model. The power density spectrum (PDS) of Astrosat and NICER revealed two distinct broad features (BF1 and BF2). The multiple Lorentzian components were used to fit these features, and the frequency came out to be 0.22 Hz for BF1 and 2.62 Hz for BF2. For NICER (0.5-10.0 keV) and LAXPC/Astrosat (4.0-30.0 keV), we generated energy-dependent time lag and r.m.s. at the frequencies of BF1 and BF2. The time-lag spectra obtained for Astrosat and NICER showed positive behavior as a function of energy. We used a general method developed by Garg et al. 2020 to model these time lags and r.m.s. Properties. By allowing the variations in the four spectral parameters (|πΏππππ|, |πΏπ»|, |πΏππ π| and |πΏππππ π|), we were able to model the time lag and r.m.s successfully for both the features (BF1 and BF2). |
