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Dr. Prantik Nandi

Scientist C

I have worked with compact objects ranging from stellar mass to AGNs. My primary focus lies on the X-ray observations to understand the accretion dynamics around the compact objects. Additionally, I have conducted extensive broadband studies of various classes of AGNs. Some of my ongoing research interests are as follows-
(1) Investigating the spectral and temporal variability properties of Changing Look AGNs by analysing the electromagnetic spectra from optical to X-ray.
(2) I am interested in studying the hydrodynamics around black holes by using different types of spectral models.
(3) Unify various types of black holes, ranging from stellar mass to supermassive, into a cohesive unified model.
(4) Trying to understand the properties of Ultra-Luminous X-ray Sources (ULX) by using proper accretion dynamics.
(5) Probing the emission mechanism of soft excess for Seyfert 1 AGNs to gain insights into their underlying physics.
(6) Utilising various ground-based observation facilities, including the 24-inch Telescope at Sitapur Observatory, to observe transit events. By combining this data with other data from various satellites, I aim to extend the understanding of the transit events that occur in space.

I am an astrophysicist specialising in the study of compact objects, particularly supermassive black holes. These objects are typically found at the centres of each galaxy and are observed when they accrete matter from the surrounding medium. As the brightest persistent sources of radiation in the cosmos, these black holes are believed to play a crucial role in galactic evolution over cosmic timescales. As black holes are not directly visible in the electromagnetic spectrum, my research focuses on understanding the structure and evolution of the accreting material around these compact objects. For that, I analyse the properties of high-energy photons combined with multiwavelength observations. Currently, my primary research interest is investigating the variability in high-energy emissions, particularly in X-rays, in the context of active galactic nuclei astrophysics.

(1) P. Nandi, A. Chatterjee, A. Jana, S. K. Chakrabarti, S. Naik, S. Safi-Harb, H. K. Chang, J. Heyl, 'Survey of Bare Active Galactic Nuclei in the Local Universe (z < 0.2): I. On the origin of Soft-Excess', 2023, ApJS, 269 (1), 15. Click
(2) Chhotaray, B., Jaisawal, G. K., Nandi, P., Naik, S., Kumari, N., 'Long-term Study of First Galactic Ultraluminous X-ray Source Swift J0243.6+6124 UsingNICER', 2023, ApJ, 963 (2), 132. Click
(3) A. Jana, N. Kumari, P. Nandi, S. Naik, A. Chatterjee, G. K. Jaisawal, K. Hayasaki, C. Ricci,'Broadband X-ray Observation of the 2018 outburst of Changing-look Active Galactic Nucleus NGC 1566', 2021, MNRAS, 507 (1), 687-703. Click
(4) P. Nandi, A. Chatterjee, S. K. Chakrabarti, B. G. Dutta, 'Long-term X-Ray Observations of Seyfert 1 Galaxy Ark 120: On the origin of soft- excess', 2021, MNRAS, 506, 3111 - 3127. Click
(5) P. Nandi, S. K. Chakrabarti, S. Mondal,'Spectral Properties of NGC 4151 and the Estimation of Black Hole Mass Using TCAF Solution',2019, ApJ, 877, 65.Click


Curriculum Vitae