Niranjan Chandra Roy

Graduate Student

Physics

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Niranjan is a doctoral candidate at UConn Physics working with Prof. Daniel Anglés-Alcázar on creating and analyzing synthetic observations of cosmological zoom-in and hyper-refinement FIRE (Feedback In Realistic Environments) simulations. Such synthetic observations in both line and continuum emissions are to be used as comparable templates for state-of-the-art telescopes, e.g., James Webb Space Telescope, Hubble Space Telescope, Atacama Large Millimeter Array, and will help to unveil the hidden drivers of galaxy growth, a major science goal of this decade. 

Ongoing projects (including collaborations):

• Synthetic emission lines tracing multi-phase interstellar medium and outflows in cosmological FIRE simulations.
• Little Red Dots on FIRE: formation and observational signatures of ultra-compact early galaxies in high-resolution cosmological hydrodynamic simulations.
• Synthetic Emission Lines Tracing Rotational and Turbulent Support in FIRE Galaxies Across Redshifts.
  • (Undergraduate project led by Grace Farrell, mentored by Niranjan)
• Capturing multi-phase ISM and kinematic properties of the host galaxy of a massive merger system using synthetic IFUs including AGN radiation field.
  • (In collaboration with WISE-2246 team)
• Inferring physical conditions from emission line IFU data cubes of FIRE galaxies using machine learning models.
  • (In collaboration with Arnab Lahiry and Prof. Tanio Diaz-Santos)
• Denoising benchmarks for spectral data cubes of high-z galaxies.
  • (In collaboration with Arnab Lahiry and Prof. Tanio Diaz-Santos)

He has also worked on the progenitor problem of type IA supernovae under the supervision of Prof. Robert Fisher, by simulating these high-energy astrophysical events in multi-dimensions with GPU-accelerated nuclear networks.

He is a first-generation college student from Bangladesh. He completed his Master’s in Physics from the University of Massachusetts Dartmouth, his second Master’s in Physics from the University of Connecticut, and his baccalaureate in Electrical and Electronic Engineering from Bangladesh University of Engineering and Technology (BUET).

Recent publications:

NASA ADS link to papers by Niranjan:
https://ui.adsabs.harvard.edu/public-libraries/ydsjXkk_SfGILBU–Lex_g

• Roy, N.C., Anglés-Alcázar, D., Cochrane, R.K., Richings, A. J., Mercedes-Feliz, J.,  Hayward, C.C., Faucher-Giguère, C., Lambrides, E., et al, “Little Red Dots on FIRE: Exploring the formation and observational signatures of ultra-compact early galaxies”,
  Preprint, June 2026, https://ui.adsabs.harvard.edu/abs/2026arXiv260623683R
• Mercedes-Feliz, J., Anglés-Alcázar, D., Cevallos, J., Oh, B.K., García-Burillo, S., Cochrane, R.K., Ramos Almeida, C., Faucher-Giguère, C, …, Roy, N.C., et al, “Investigating black hole accretion and feedback self-regulation in Seyfert galaxies using the FIRE-3 cosmological hydrodynamic simulations” ,
  Preprint, June 2026, https://ui.adsabs.harvard.edu/abs/2026arXiv260625025M/abstract
• Marszewski, A.G., Faucher-Giguère, C., Sun, G., Anglés-Alcazar, D., Feldmann, R., Su, K., Miller, T. B.,
  Roy, N.C., “Little Red Dots on FIRE: The Ability of Bursty Galaxies to Host an Abundant Population of High-Redshift AGN”,
  The Astrophysical Journal Letters, 2026 January 30, https://ui.adsabs.harvard.edu/abs/2026arXiv260122213M/abstract
• Vayner, A., Diaz-Santos, T., Ferkinhoff C. D. , Eisenhardt, P. R. M., Stern, D., Armus, L., Hensley, B. S., Angles-Alcazar, D., …, Roy, N.C. et al, “Probing the Physics of Dusty Outflows through Complex Organic Molecules in the Early Universe”,
  Preprint, 2025 October 10, https://ui.adsabs.harvard.edu/abs/2025arXiv251009870V/abstract
• Lahiry, A.,  Starck, J.-L., Díaz-Santos, T., Roy, N.C., Anglés-Alcázar, D., Tsakalides, P., Tsagkatakis, G., “Deep and Sparse Denoising Benchmarks for Spectral Data Cubes of High-z Galaxies: From Simulations to ALMA observations“,
  Astronomy and Astrophysics, 2025 September 24. https://www.aanda.org/articles/aa/pdf/forth/aa57364-25.pdf
• Vayner, A., Diaz-Santos, T., Eisenhardt, P. R. M., Stern, D., Armus, L., Angles-Alcazar, D., Assef, R.J., Fernandez Aranda, R., Blain, A. W., Jun, H.D., Tsai, C.W., Roy, N.C. et al, “Powerful nuclear outflows and circumgalactic medium shocks driven by the most luminous quasar in the Universe”,
  The Astrophysical Journal, 2025 August 20,  https://iopscience.iop.org/article/10.3847/1538-4357/addbdd
• Roy, N.C., Tiwari, V., Bobrick, A., Kosakowski, D., Fisher, R., Perets, H, B., Kashyap, R., Lorén-Aguilar, P., García-Berro, E, “3D Hydrodynamical Simulations of Helium-Ignited Double-degenerate White Dwarf Mergers”,
  The Astrophysical Journal Letters, 932:L24 (7pp), 2022 June 20, https://iopscience.iop.org/article/10.3847/2041-8213/ac75e7

News:

• Roy et al 2022 featured in a Quanta article, “What Lights the Universe’s Standard Candles?”

 

Recent talks:

• Little Red Dots Workshop 2026, June 2026.
• FOLIAGE (FIRE mOdeLIng & Galaxy Evolution Workshop), Wesleyan University, November 2025.
• Astro Seminar, Iowa State University, April 2025.
• New England FOLIAGE (FIRE mOdeLIng & Galaxy Evolution Workshop), UConn, November 2024.
• Cosmic Odysseys 2024, Agios Nikolaos, Greece; June 2024.
• JWST-W2246 collaboration meeting, FORTH, Greece; June 2024.
• STScI-JHU Joint Galaxy Journal Club, Space Telescope Science Institute, Baltimore; March 2024.
• Physics Seminar Series, University of Massachusetts Dartmouth; February 2024.
• Center for Theory and Computation seminar, University of Maryland at College Park, August 2023.
• Fake Light Workshop, Center for Computational Astrophysics, Flatiron Institute, June 2023.