Time resolved spectroscopy of a GRS 1915 + 105 flare during its unusual low state using AstroSat
- Title
- Time resolved spectroscopy of a GRS 1915 + 105 flare during its unusual low state using AstroSat
- Creator
- Boked S.; Maqbool B.; Jithesh V.; Misra R.; Bhat N.I.; Bhulla Y.
- Description
- Since its disco v ery in 1992, GRS 1915 + 105 has been among the brightest sources in the X-ray sky. Ho we ver, in early 2018, it dimmed significantly and has stayed in this faint state ever since. We report on AstroSat and NuSTAR observation of GRS 1915 + 105 in its unusual low/hard state during 2019 May. We performed time-resolved spectroscopy of the X-ray flares observed in this state and found that the spectra can be fitted well using highly ionized absorption models. We further show that the spectra can also be fitted using a highly relativistic reflection dominated model, where for the lamp post geometry, the X-ray emitting source is al w ays very close to the central black hole. For both interpretations, the flare can be attributed to a change in the intrinsic flux, rather than dramatic variation in the absorption or geometry. These reflection dominated spectra are very similar to the reflection dominated spectra reported for active galactic nuclei in their low flux states. 2024 The Author(s).
- Source
- Monthly Notices of the Royal Astronomical Society, Vol-528, No. 4, pp. 7016-7026.
- Date
- 2024-01-01
- Publisher
- Oxford University Press
- Subject
- accretion, accretion discs; stars: black holes; stars: flare; stars: individual: GRS 1915 + 105; X-rays: binaries
- Coverage
- Boked S., Department of Physics, University of Kashmir, Srinagar, 190006, India; Maqbool B., Islamic University of Science and Technology Awantipora, Pulwama, 192122, India; Jithesh V., Department of Physics and Electronics, CHRIST (Deemed to be University), Hosur Main Road, Bengaluru, 560029, India; Misra R., Inter-University Centre for Astronomy and Astrophysics, Post Bag 4, Ganeshkhind, Pune, 411007, India; Bhat N.I., Department of Physics, University of Kashmir, Srinagar, 190006, India, Islamic University of Science and Technology Awantipora, Pulwama, 192122, India; Bhulla Y., Pacific Academy of Higher Education and Research University, Udaipur, 313003, India
- Rights
- All Open Access; Gold Open Access; Green Open Access
- Relation
- ISSN: 358711; CODEN: MNRAA
- Format
- Online
- Language
- English
- Type
- Article
Collection
Citation
Boked S.; Maqbool B.; Jithesh V.; Misra R.; Bhat N.I.; Bhulla Y., “Time resolved spectroscopy of a GRS 1915 + 105 flare during its unusual low state using AstroSat,” CHRIST (Deemed To Be University) Institutional Repository, accessed February 25, 2025, https://archives.christuniversity.in/items/show/13277.