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Black Hole

Lensing of space time around a black hole. At Oxford we study black holes observationally and theoretically on all size and time scales - it is some of our core work.

Credit: ALAIN RIAZUELO, IAP/UPMC/CNRS. CLICK HERE TO VIEW MORE IMAGES.

Dr Rohan Varadaraj

Postdoctoral Research Assistant

Research theme

  • Astronomy and astrophysics

Sub department

  • Astrophysics

Research groups

  • Galaxy formation and evolution
rohan.varadaraj@physics.ox.ac.uk
Denys Wilkinson Building, room 465
  • About
  • Publications

I am a postdoctoral research assistant working with Matt Jarvis on the evolution of galaxies in the early Universe. My focus is on studying the brightest galaxies in the first billion years using degree scale ground-based surveys (UltraVISTA, VIDEO, HSC-SSP, VOICE), and more recently the new Euclid telescope as part of the Euclid collaboration. I am also interested in the resolved properties of these galaxies, for example size measurements using JWST.

I completed my DPhil in Oxford in June 2025, supervised by Rebecca Bowler and Matt Jarvis.

https://github.com/RohanVaradaraj

Research interests

Galaxy Evolution
High-redshift galaxies
Galaxy formation

Selected publications

The sizes of bright Lyman-break galaxies at z ≃ 3–5 with JWST PRIMER

Monthly Notices of the Royal Astronomical Society Oxford University Press (OUP) 533:3 (2024) 3724-3741
RG Varadaraj, RAA Bowler, MJ Jarvis, NJ Adams, N Choustikov, AM Koekemoer, AC Carnall, DJ McLeod, JS Dunlop, CT Donnan, NA Grogin

The bright end of the galaxy luminosity function at z ≃ 7 from the VISTA VIDEO survey

Monthly Notices of the Royal Astronomical Society Oxford University Press 524:3 (2023) 4586-4613
Rg Varadaraj, Raa Bowler, Mj Jarvis, Nj Adams, B Haussler

The total rest-frame UV luminosity function from 3 < z < 5: a simultaneous study of AGN and galaxies from −28 < MUV < −16

Monthly Notices of the Royal Astronomical Society Oxford University Press 523:1 (2023) 327-346
Nj Adams, Raa Bowler, Mj Jarvis, Rg Varadaraj, B Haussler

The discovery of a z=0.7092 OH megamaser with the MIGHTEE survey

Monthly Notices of the Royal Astronomical Society Oxford University Press 529:4 (2023) 3484-3494
Matthew Jarvis, Ian Heywood, Anastasia Ponomareva, Rohan Varadaraj, Imogen Whittam, Hengxing Pan
261977
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