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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 Imogen Whittam

Hintze Fellow

Research theme

  • Astronomy and astrophysics

Sub department

  • Astrophysics

Research groups

  • Galaxy formation and evolution
  • Hintze Centre for Astrophysical Surveys
  • MeerKAT
  • The Square Kilometre Array (SKA)
  • Rubin-LSST
  • Euclid
imogen.whittam@physics.ox.ac.uk
Denys Wilkinson Building, room 558
Personal website
  • About
  • Publications

MIGHTEE: Are giant radio galaxies more common than we thought?

(2020)

Authors:

J Delhaize, I Heywood, M Prescott, MJ Jarvis, I Delvecchio, IH Whittam, SV White, MJ Hardcastle, CL Hale, J Afonso, Y Ao, M Brienza, M Brueggen, JD Collier, E Daddi, M Glowacki, N Maddox, LK Morabito, I Prandoni, Z Randriamanakoto, S Sekhar, Fangxia An, NJ Adams, S Blyth, RAA Bowler, L Leeuw, L Marchetti, SM Randriamampandry, K Thorat, N Seymour, O Smirnov, AR Taylor, C Tasse, M Vaccari
More details from the publisher
Details from ArXiV

The infrared-radio correlation of star-forming galaxies is strongly M$_{\star}$-dependent but nearly redshift-invariant since z$\sim$4

ArXiv 2010.0551 (2020)

Authors:

I Delvecchio, E Daddi, MT Sargent, MJ Jarvis, D Elbaz, S Jin, D Liu, IH Whittam, H Algera, R Carraro, C D'Eugenio, J Delhaize, BS Kalita, S Leslie, D Cs Molnar, M Novak, I Prandoni, V Smolcic, Y Ao, M Aravena, F Bournaud, JD Collier, SM Randriamampandry, Z Randriamanakoto, G Rodighiero, J Schober, SV White, G Zamorani
Details from ArXiV

The relation between the diffuse X-ray luminosity and the radio power of the central AGN in galaxy groups

Monthly Notices of the Royal Astronomical Society Royal Astronomical Society 497:2 (2020) 2163-2174

Authors:

T Pasini, M Brueggen, F de Gasperin, L Birzan, E O'Sullivan, A Finoguenov, Imogen Whittam, Ian Heywood, Matt Jarvis, M Gitti, F Brighenti, Jd Collier, G Gozaliasl

Abstract:

Our understanding of how active galactic nucleus feedback operates in galaxy clusters has improved in recent years owing to large efforts in multiwavelength observations and hydrodynamical simulations. However, it is much less clear how feedback operates in galaxy groups, which have shallower gravitational potentials. In this work, using very deep Very Large Array and new MeerKAT observations from the MIGHTEE survey, we compiled a sample of 247 X-ray selected galaxy groups detected in the COSMOS field. We have studied the relation between the X-ray emission of the intra-group medium and the 1.4 GHz radio emission of the central radio galaxy. For comparison, we have also built a control sample of 142 galaxy clusters using ROSAT and NVSS data. We find that clusters and groups follow the same correlation between X-ray and radio emission. Large radio galaxies hosted in the centres of groups and merging clusters increase the scatter of the distribution. Using statistical tests and Monte Carlo simulations, we show that the correlation is not dominated by biases or selection effects. We also find that galaxy groups are more likely than clusters to host large radio galaxies, perhaps owing to the lower ambient gas density or a more efficient accretion mode. In these groups, radiative cooling of the intra-cluster medium could be less suppressed by active galactic nucleus heating. We conclude that the feedback processes that operate in galaxy clusters are also effective in groups.
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Details from ORA
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Details from ArXiV

Understanding mechanical feedback from HERGs and LERGs

ArXiv 1810.06899 (2018)
Details from ArXiV

Understanding mechanical feedback from HERGs and LERGs

Proceedings of the International Astronomical Union Cambridge University Press (CUP) 14:A30 (2018) 86-89
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