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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.

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
  • About
  • Publications

I am a final year DPhil student working with Rebecca Bowler and Matt Jarvis studying the evolution of rare, bright and massive high-redshift galaxies, in particular those at z~3-7 within the XMM-LSS, ECDF-S and COSMOS fields. I am utilising data from the UltraVISTA and VIDEO survey (near-infrared), HSC-SSP and the VOICE survey (both optical). I've also been using JWST imaging in these fields to look at the resolved properties of bright galaxies identified in ground-based imaging. More recently, I've been looking at first data from the Euclid telescope,  which is providing near-infrared degree-scale imaging from space for the first time. These multi-wavelength data will allow us to study the bright end of the luminosity function at these epochs and study the size evolution of galaxies in their rest-optical light beyond z=3.

I previously studied Maths & Physics at the University of Warwick. For my 4th year project I studied the evaporation of hot gas giants with high resolution spectroscopy of a helium line in the infrared, under the supervision of Matteo Brogi.

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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