Vivek Kumar Jha
Post-Doctoral Fellow
Email: vjha [at] ncra.tifr.res.in
Phone: 02025719252
Extn: 9252
Office: F218C
National Centre for Radio Astrophysics
Tata Institute of Fundamental Research
Savitribai Phule Pune University Campus,
Pune 411 007
Maharashtra, INDIA
Tata Institute of Fundamental Research
Savitribai Phule Pune University Campus,
Pune 411 007
Maharashtra, INDIA
Main Research Areas: Active galactic nuclei; Quasar accretion disks; AGN multi‑wavelength variability; Reverberation Mapping; Supermassive Black Holes; Light curve modelling; Survey Science.
Biography:
Vivek completed his B.Sc. (Honours) in Physics from Deshbandhu College, University of Delhi, in 2014. He then pursued an M.Sc. in Physics at the Institute of Science, Banaras Hindu University (BHU), Varanasi, graduating in 2017. Subsequently, he joined ARIES, Nainital, where he completed his Ph.D. in Physics, awarded by Deen Dayal Upadhyaya, Gorakhpur University in February 2024. Following his Ph.D., Vivek worked as a postdoctoral researcher at the Manipal Centre for Natural Sciences (MCNS), Manipal, from December 2023 to June 2024. He joined NCRA as a postdoctoral fellow in July 2024.Research description:
My current research focuses on the properties of theActive Galactic Nuclei (AGN). My Ph.D. thesis aimed to resolve the inner (sub-parsec) regions of AGNs through multi-band observations, inferring the structure and kinematics of matter in these locations. Ongoing projects include resolving the accretion disk structure using Reverberation Mapping, understanding the dynamics of gas in the broad line region (BLR) through emission line diagnostics, and studying AGN microvariability to correlate phenomena observed across different wavelengths. Additionally, I employ Photometric Reverberation Mapping to efficiently measure accretion disk sizes and explore AGN flux variability using optical light curves from the Zwicky Transient Facility (ZTF) survey.Selected publications:
1. Exploring the AGN Accretion Disks using Continuum Reverberation Mapping (V. K. Jha, R. Joshi, H. Chand et al. 2024, Bulletin de la Societe Royale des Sciences de Liege, 93, 766). 2. Evidence of Jet-induced Optical Microvariability in Radio‑loud Narrow Line Seyfert 1 Galaxies (V. Ojha, V. K. Jha, H. Chand \& V. Singh 2022, MNRAS, 514, 5607). 3. Accretion Disk Sizes from Continuum Reverberation Mapping of AGN Selected from the ZTF Survey. (V. K. Jha, R. Joshi, H. Chand et al. 2022, MNRAS, 511, 3005). 4. A comparative study of the physical properties of a representative sample of Narrow and broad‑line Seyfert galaxies (V. K. Jha, H. Chand, V. Ojha et al. 2022, MNRAS, 510, 4379). 5. Properties of Broad and Narrow Line Seyfert galaxies selected from SDSS (V. K. Jha, H. Chand, & V. Ojha 2020, Communications of the Byurakan Astrophysical Observatory, 67, 219).
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