Comprehensive spectro-temporal studies of GX 17+2 using AstroSat observations
- Title
- Comprehensive spectro-temporal studies of GX 17+2 using AstroSat observations
- Creator
- Thomas N.T.; Lavanya S.; Gudennavar S.B.; Bubbly S.G.
- Description
- We performed a comprehensive spectro-temporal study of the Z-type neutron star low-mass X-ray binary GX 17+2 using long term data from the AstroSat/Soft X-ray Telescope (SXT) and Large Area X-ray Proportional Counter (LAXPC). The hardnessintensity diagrams (HIDs) of the source revealed a positive correlation between the hardness and intensity, characteristic of soft spectral state. Additionally, the LAXPC-20 HID showed the presence of secular shifts in both hardness and intensity. Time-averaged spectral modelling in the 0.7 ? 30.0 keV energy range indicated that the spectra could be well fitted with the model combination: constant edge edge tbabs thcomp bbodyrad. This analysis yielded a blackbody radius (Rbb) of ?59 km, photon index (?) of ?2.84 and electron temperature (kTe) of ?4.84 keV. Time-averaged temporal analysis revealed normal branch oscillations (NBOs) at ? 7 Hz in Observations 1 and 3, flaring branch oscillation (FBO) at ?15 Hz in Observation 2, and horizontal branch oscillation (HBO) at ?36 Hz in Observation 5. Flux resolved spectro-temporal analysis indicated that the source remained in the soft spectral state throughout all observations. A positive correlation was observed between kTbb, Fbb and Fbol, whereas an anti-correlation was noted between kTe and Fbol. The constant frequency of NBOs with an increase in Fbol suggests that their origin lies in a region strongly influenced by the corona, as explained by the radiation-hydrodynamic model. The origin of FBOs may be attributed to the damped radiation-hydrodynamic mode of radial flow, while the origin of HBOs is supported by the beat-frequency model. 2024 Elsevier B.V.
- Source
- Journal of High Energy Astrophysics, Vol-45, pp. 250-261.
- Date
- 2025-01-01
- Publisher
- Elsevier B.V.
- Subject
- Accretion, accretion discs; Stars: neutron; X-rays: binaries: GX 17+2
- Coverage
- Thomas N.T., Department of Physics and Electronics, CHRIST University, Karnataka, Bangalore, 560029, India; Lavanya S., Department of Physics and Electronics, CHRIST University, Karnataka, Bangalore, 560029, India; Gudennavar S.B., Department of Physics and Electronics, CHRIST University, Karnataka, Bangalore, 560029, India; Bubbly S.G., Department of Physics and Electronics, CHRIST University, Karnataka, Bangalore, 560029, India
- Rights
- Restricted Access
- Relation
- ISSN: 22144048
- Format
- Online
- Language
- English
- Type
- Article
Collection
Citation
Thomas N.T.; Lavanya S.; Gudennavar S.B.; Bubbly S.G., “Comprehensive spectro-temporal studies of GX 17+2 using AstroSat observations,” CHRIST (Deemed To Be University) Institutional Repository, accessed April 22, 2025, https://archives.christuniversity.in/items/show/12507.