Probing the soft state evolution of 4U 1543-47 during its 2021 outburst using AstroSat
- Title
- Probing the soft state evolution of 4U 1543-47 during its 2021 outburst using AstroSat
- Creator
- Husain N.; Bhargava Y.; Garg A.; Mudambi S.P.; Misra R.; Sen S.
- Description
- 4U 1543-47 underwent its brightest outburst in 2021 after two decades of inactivity. During its decay phase, AstroSat conducted nine observations of the source spanning from 2021 July 1 to September 26. The first three observations were performed with an offset of 40 arcmin with AstroSat/LAXPC, while the remaining six were on-axis observations. In this report, we present a comprehensive spectral analysis of the source as it was in the High/Soft state during the entire observation period. The source exhibited a disc-dominated spectra with a weak high-energy tail (power-law index ?2.5) and a high inner disc temperature (?0.84 keV). Modelling the disc continuum with non-relativistic and relativistic models, we find inner radius to be significantly truncated at >10 Rg. Alternatively, to model the spectral evolution with the assumption that the inner disc is at the innermost stable circular orbit, it is necessary to introduce variation in the spectral hardening in the range ?1.5-1.9. 2023 The Author(s).
- Source
- Monthly Notices of the Royal Astronomical Society, Vol-524, No. 4, pp. 5817-5826.
- Date
- 2023-01-01
- Publisher
- Oxford University Press
- Subject
- accretion: accretion discs; black hole physics; methods: data analysis; stars: individual: 4U 1543-47; X-rays: binaries
- Coverage
- Husain N., Department of Physics, Jamia Millia Islamia, New Delhi, 110025, India; Bhargava Y., Deparment of Astronomy and Astrophysics, Tata Institute of Fundamental Research, Mumbai, 400005, India, Inter-University Centre for Astronomy and Astrophysics, Pune, 411007, India; Garg A., Inter-University Centre for Astronomy and Astrophysics, Pune, 411007, India; Mudambi S.P., Department of Physics and Electronics, CHRIST (Deemed to Be University), Bengaluru, 560029, India; Misra R., Inter-University Centre for Astronomy and Astrophysics, Pune, 411007, India; Sen S., Department of Physics, Jamia Millia Islamia, New Delhi, 110025, India
- Rights
- All Open Access; Green Open Access
- Relation
- ISSN: 358711; CODEN: MNRAA
- Format
- Online
- Language
- English
- Type
- Article
Collection
Citation
Husain N.; Bhargava Y.; Garg A.; Mudambi S.P.; Misra R.; Sen S., “Probing the soft state evolution of 4U 1543-47 during its 2021 outburst using AstroSat,” CHRIST (Deemed To Be University) Institutional Repository, accessed February 23, 2025, https://archives.christuniversity.in/items/show/14028.