| Name: | Shyam Prakash V P |
| Affiliation: | U. R Rao Satellite Centre, ISRO, Bangalore |
| Conference ID : | ASI2024_203 |
| Title : | AstroSat View of the Neutron Star Low-mass X-Ray Binary GX 5-1 |
| Authors : | Shyam Prakash V P, Vivek Kumar Agrawal |
| Authors Affiliation: | Space Astronomy Group, ISITE Campus, U. R. Rao Satellite Centre, ISRO, Bengaluru 560037, India |
| Mode of Presentation: | Poster |
| Abstract Category : | High Energy Phenomena, Fundamental Physics and Astronomy |
| Abstract : | We present the spectral and timing study of the bright Neutron star (NS)-Low mass X-ray Binary (LMXB) GX 5-1 using AstroSat/SXT and LAXPC observations conducted in the year 2018. GX 5-1 is a persistent LMXB, which is classified as a “Z” source as it tracks a Z-pattern in its Hardness Intensity Diagram (HID) and is characterized by an extended Horizontal branch (HB) and a weak Flaring branch (FB). During these observations, the source traces out the complete HB and the Normal Branch (NB) of the Z track. Understanding the spectral and temporal evolution of the source along the ’Z’ track can probe the accretion process in the vicinity of Neutron star. Spectral fitting was performed using the simultaneous SXT and LAXPC data in the energy range 0.7–20 keV for different segments in the HID. We used a multi-temperature disc black body model for the disc emission and a thermal Comptonization model for the corona. The Power Density Spectrum (PDS) in HB, NB and the Hard apex
displays Quasi Periodic Oscillation with frequency changes from ∼ 13 Hz to ∼44 Hz along the HB and ∼5 Hz at the NB. We observe that, the increase in QPO frequency observed as the source moves from HB to HA along the Z track is strongly associated with flux from Comptonization component. |
