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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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The faint radio source population at 15.7 GHz – IV. The dominance of core emission in faint radio galaxies

Monthly Notices of the Royal Astronomical Society Oxford University Press 493:2 (2020) 2841-2853

Authors:

Imogen Whittam, DA Green, Matthew Jarvis, JM Riley

Abstract:

We present 15-GHz Karl G. Jansky Very Large Array observations of a complete sample of radio galaxies selected at 15.7 GHz from the Tenth Cambridge (10C) survey. 67 out of the 95 sources (71 per cent) are unresolved in the new observations and lower frequency radio observations, placing an upper limit on their angular size of ∼2 arcsec. Thus, compact radio galaxies, or radio galaxies with very faint jets, are the dominant population in the 10C survey. This provides support for the suggestion in our previous work that low-luminosity (⁠L<1025W~Hz−1⁠) radio galaxies are core dominated, although higher resolution observations are required to confirm this directly. The 10C sample of compact, high-frequency selected radio galaxies is a mixture of high-excitation and low-excitation radio galaxies and displays a range of radio spectral shapes, demonstrating that they are a mixed population of objects.
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Details from ORA
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Understanding mechanical feedback from HERGs and LERGs

ArXiv 1810.06899 (2018)
Details from ArXiV

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