Correlated variability of the reflection fraction with the X-ray flux and spectral index for Mrk 478
- Title
- Correlated variability of the reflection fraction with the X-ray flux and spectral index for Mrk 478
- Creator
- Barua S.; Jithesh V.; Misra R.; Medhi B.J.; Adegoke O.
- Description
- The X-ray spectrum of Mrk 478 is known to be dominated by a strong soft excess that can be described using relativistic blurred reflection. Using observations from XMM-Newton, AstroSat, and Swift, we show that for the long-term (?years) and intermediate-term (days to months) variability, the reflection fraction is anticorrelated with the flux and spectral index, which implies that the variability is due to the hard X-ray producing corona moving closer to and further from the black hole. Using flux-resolved spectroscopy of the XMM-Newton data, we show that the reflection fraction has the same behaviour with flux and index on short time-scales of hours. The results indicate that both the long- and short-term variability of the source is determined by the same physical mechanism of strong gravitational light bending causing enhanced reflection and low flux as the corona moves closer to the black hole. 2022 The Author(s) Published by Oxford University Press on behalf of Royal Astronomical Society.
- Source
- Monthly Notices of the Royal Astronomical Society, Vol-517, No. 1, pp. 801-807.
- Date
- 2022-01-01
- Publisher
- Oxford University Press
- Subject
- accretion, accretion discs; black hole physics; galaxies: active; galaxies: Seyfert; X-rays: individual: Mrk 478
- Coverage
- Barua S., Department of Physics, Gauhati University, Assam, Jalukbari, Guwahati, 781014, 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 (IUCAA), PB No. 4, Ganeshkhind, Pune, 411007, India; Medhi B.J., Department of Physics, Gauhati University, Assam, Jalukbari, Guwahati, 781014, India; Adegoke O., Cahill Center for Astronomy and Astrophysics, California Institute of Technology, Pasadena, 91125, CA, United States
- Rights
- All Open Access; Green Open Access
- Relation
- ISSN: 358711; CODEN: MNRAA
- Format
- Online
- Language
- English
- Type
- Article
Collection
Citation
Barua S.; Jithesh V.; Misra R.; Medhi B.J.; Adegoke O., “Correlated variability of the reflection fraction with the X-ray flux and spectral index for Mrk 478,” CHRIST (Deemed To Be University) Institutional Repository, accessed February 25, 2025, https://archives.christuniversity.in/items/show/14823.