Priyamvada Natarajan

Priyamvada "Priya" Natarajan is a theoretical astrophysicist, Chair of the department of astronomy and professor of physics at Yale University. She is noted for her work in mapping dark matter and dark energy, particularly in gravitational lensing and in models describing the assembly and accretion histories of supermassive black holes. She authored the book Mapping the Heavens: The Radical Scientific Ideas That Reveal the Cosmos. She has been featured on shows such as Black Hole Apocalypse on PBS, showcasing her work and background. Early life Priya Natarajan was born in Coimbatore, Tamil Nadu in India to academic parents. She grew up in New Delhi, where she would visit Nehru Planetarium Delhi and had a great interest in celestial and terrestrial maps as a kid. to which she commented: "it was very clear to me that it was the telescope." During her high school education, her father gifted her a computer, Commodore 64 (personal computers were not known in India at the time ), for mapping the night sky, which inspired her later education, career and writing a book Mapping the Heavens: The Radical Scientific Ideas That Reveal the Cosmos, published in 2016.

In 1984, Natarajan enrolled herself in an amateur astronomy club based at the Nehru Planetarium in New Delhi. She told the then-director of the planetarium Nirupama Raghavan that she owned a personal computer and asked for a research project. Raghavan immediately assigned her to plot the whole night sky over New Delhi. Within six weeks Natarajan self-taught spherical geometry and developed the technique to map the night sky.

With the Isaac Newton Fellowship from the University of Cambridge, Natarajan moved to England for a fresh doctoral course to work with Martin Rees at the Institute of Astronomy, on supermassive black holes. She received a Ph.D. degree in 1998. She was the first woman astrophysicist elected as a Fellow at Trinity College. As of 2024, she was a Joseph S. and Sophia S. Fruton Professor and Chair of Astronomy.

Natarajan held a Whitney Humanities Fellowship at Yale (2006–2007) and was the Emeline Conland Bigelow Fellow at the Radcliffe Institute for Advanced Study at Harvard (2008–2009). This model addresses the problem of how supermassive black holes observed at very high redshift could have grown so massive so quickly.

In 2023, Natarajan and collaborators reported the detection of UHZ1, an X-ray-luminous source at redshift z ≈ 10.1 identified using the James Webb Space Telescope and Chandra X-ray Observatory, consistent with an actively accreting black hole with properties matching the direct-collapse seed model.

Self-regulation of black hole growth Natarajan proposed that AGN feedback imposes an upper mass limit — a "ceiling" — on black hole growth, predicting that the most massive black holes self-regulate through the energy they inject into their surroundings. This prediction, made around 2008, was subsequently confirmed by observational surveys of black hole demographics. Honors and awards Fellow, Royal Astronomical Society, 2008 Emeline Conland Bigelow Fellowship, Radcliffe Institute for Advanced Study, Harvard, 2008–2009 Honorary Professor for Life, University of Delhi "Genius Award", Liberty Science Center, 2022 Fellow, American Academy of Arts and Sciences, 2023 Fellow, American Astronomical Society, 2024 Time 100 Most Influential People, 2024 Dannie Heineman Prize for Astrophysics, 2025