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Spectral ageing in the lobes of cluster-centre FR II radio galaxies
(2015-12-21)
Recent investigations have shown that many parameters and assumptions made in the application of spectral-ageing models to FR II radio galaxies (e.g. injection index, uniform magnetic field, non-negligible cross-lobe age ...
Centaurus A: constraints on the nature of the giant lobe filaments from XMM-Newton observations
(2015-12-11)
We report on deep XMM-Newton observations of the vertex filament in the southern giant lobe of the Fanaroff-Riley class I radio galaxy Centaurus A. We find no X-ray excess from the filament region and place a 3 sigma upper ...
The link between accretion mode and environment in radio-loud active galaxies
(2015-11-01)
The interactions between radio-loud AGN and their environments play an important rôle in galaxy and cluster evolution. Recent work has demonstrated fundamental differences between high- and low-excitation radio galaxies ...
Herschel-ATLAS: The connection between star formation and AGN activity in radio-loud and radio-quiet active galaxies
(2015-10-01)
We examine the relationship between star formation and active galactic nuclei (AGN) activity by constructing matched samples of local (0 < z < 0.6) radio-loud and radio-quiet AGN in the Herschel-Astrophysical Terahertz ...
The LOFAR Multifrequency Snapshot Sky Survey (MSSS) : I. Survey description and first results
(2015-10-01)
We present the Multifrequency Snapshot Sky Survey (MSSS), the first northern-sky Low Frequency Array (LOFAR) imaging survey. In this introductory paper, we first describe in detail the motivation and design of the survey. ...
Disks and Jets : Gravity, Rotation and Magnetic Fields
(2015-10)
Magnetic fields are fundamental to the dynamics of both accretion disks and the jets that they often drive. We review the basic physics of these phenomena, the past and current efforts to model them numerically with an ...
Optical detection of the Pictor A jet and tidal tail : evidence against an IC/CMB jet
(2015-07-20)
New images of the FR II radio galaxy Pictor A from the Hubble Space Telescope reveal a previously undiscovered tidal tail, as well as a number of jet knots coinciding with a known X-ray and radio jet. The tidal tail is ...
Black hole masses, accretion rates and hot- and cold-mode accretion in radio galaxies at z ~ 1
(2015-02-21)
Understanding the evolution of accretion activity is fundamental to our understanding of how galaxies form and evolve over the history of the Universe. We analyse a complete sample of 27 radio galaxies which includes both ...
Internal entrainment and the origin of jet-related broad-band emission in Centaurus A
(2015-02-11)
The dimensions of Fanaroff-Riley class I jets and the stellar densities at galactic centres imply that there will be numerous interactions between the jet and stellar winds. These may give rise to the observed diffuse and ...
The cluster environments of radio-loud AGN
(Cambridge University Press, 2015)
Radio-loud AGN play an important role in galaxy evolution. We need to understand their properties, and the processes that affect their behaviour in order to model galaxy formation and development. We here present preliminary ...