Sanna Gulati
Post-Doctoral Fellow
Email: sanna [at] ncra.tifr.res.in
Phone: 020-2571 9278
Extn: 9278
Office: 218C
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: Physics of Active Galaxies: Astrophysical jets; Accretion disk-jet connections; AGN variability; AGN spectral energy distributions.
Biography:
Sanna completed her B.Sc. from Isabella Thoburn College, Lucknow University, Lucknow, in 2013 and her M.Sc. in Physics from the Department of Sciences, Manipal Academy of Higher Education, Manipal, in 2015. She did short-term projects at the Bhabha Atomic Research Centre, Mumbai, and the Indian Institute of Astrophysics, Bangalore, over 2015-2016 and then began her doctoral studies in 2017, working with Debbijoy Bhattacharya at the Manipal Centre for Natural Sciences, Centre of Excellence, Manipal Academy of Higher Education. She obtained her Ph.D. degree in July 2023 and then moved to NCRA-TIFR in July 2023 as a post-doctoral fellow.Research description:
Active galaxies are amongst the most luminous astrophysical objects in the universe, powered by accretion onto supermassive black holes lying at their centres. Blazars belong to a class of active galaxies whose relativistic jets make small angles to the line of sight. Their emission is hence expected to be highly jet-dominated, making them excellent laboratories to study jet physics. However, to probe possible connections between accretion disks and jets, and between the active galactic nuclei (AGNs) and their environment, it is essential to study AGNs with large inclination jets; these are often referred to as “misaligned active galaxies” (MAGNs). Comparisons between the derived disk and jet parameters in on-axis and misaligned sources can be used to probe the AGN unification scenario. My research work focuses on understanding the physical processes in both MAGNs and on-axis blazars by carrying out broadband spectral, temporal, and spatial studies utilising various ground-based (e.g. HCT) and space-based (e.g. Swift, AstroSat, Fermi) observatories, aiming to understand connections between MAGNs and their on-axis counterparts.Selected publications:
1. "Multiwavelength study of radio galaxy Pictor A: detection of western hotspot in far-UV and possible origin of high energy emissions", S. Gulati, D. Bhattacharya, M. C. Ramadevi et al. 2023, MNRAS, 521, 2704
2. "Multiwavelength monitoring of NGC 1275 over a decade: evidence of a shift in synchrotron peak frequency and long-term multiband flux increase", S. Gulati, D. Bhattacharya, S. Bhattacharyya et al. 2021, MNRAS, 503, 446
3. "Intra-night optical variability of misaligned active galaxies", D. Bhattacharya, S. Gulati, C. S. Stalin 2019, MNRAS, 483, 3382
4. "Unusual long term low activity states of EGRET Blazars in Fermi Era", D. Bhattacharya, Krishna Mohana A, S. Gulati et al. 2017, MNRAS, 471, 5008
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