We discuss CSS radio galaxies from 2 samples of radio sources. The rst sample is a complete sample of 28 3CR galaxies with redshifts in the range 0:6 < z < 1:8 for which we have HST, UKIRT and VLA imaging data. The 2 CSS galaxies contained in this sample, 3C49 and 3C241, appear to be less active than galaxies with radio sizes of order 50{100 kpc, but similar in activity to galaxies with radio s...

With the Hubble Space Telescope we have obtained images of 9 of the most distant radio galaxies. The galaxies, which have redshifts between z = 2.3 and z = 3.6, were observed with the WFPC2 camera in a broad band filter (F606W or F707W, roughly equivalent to V or R-band), corresponding to the near ultraviolet emission in the rest frame of the radio galaxies. The total observing time was 2 orbit...

We present deep near–infrared images of high redshift radio galaxies (HzRGs) obtained with the Near Infrared Camera (NIRC) on the Keck I telescope. In most cases, the near–IR data sample rest wavelengths free of contamination from strong emission lines and at λrest > 4000Å, where older stellar populations, if present, might dominate the observed flux. At z > 3, the rest–frame optical morphologi...

We present images showing the first detections of polarization on parsec scales in the nuclei of four Fanaroff-Riley type I (low-luminosity) radio galaxies. Observations with Very Long Baseline Interferometry at λ 3.6cm reveal the presence of ordered magnetic fields within ∼1650 Schwarzchild radii of the putative central supermassive black hole. The relatively high fractional polarization in th...

We explore the cosmic evolution of radio AGN with low radio powers (L1.4GHz . 5× 10 25 W Hz) out to z = 1.3 using to-date the largest sample of ∼ 600 low luminosity radio AGN at intermediate redshift drawn from the VLA-COSMOS survey. We derive the radio luminosity function for these AGN, and its evolution with cosmic time assuming two extreme cases: i) pure luminosity and ii) pure density evolu...

We present a detailed analysis of 256 radio sources from our deep (flux density limit of 42 μJy at the field centre at 1.4 GHz) Chandra Deep Field South 1.4 and 5 GHz VLA survey. The radio population is studied by using a wealth of multi-wavelength information in the radio, optical, and X-ray bands. The availability of redshifts for ∼ 80% of the sources in our complete sample allows us to deriv...

We present a Chandra and XMM-Newton spectral analysis of the nuclei of the radio galaxies and radio-loud quasars from the 3CRR sample in the redshift range 0.1 < z < 0.5. In the range of radio luminosity sampled by these objects, mostly FRIIs, it has been clear for some time that a population of radio galaxies ('low-excitation radio galaxies') cannot easily participate in models that unify narr...

We compare high-resolution optical and radio imaging of 12 luminous submillimeter (submm) galaxies at a median z = 2.2 ± 0.2 observed with Hubble Space Telescope (HST) and the MERLIN and VLA radio interferometers at comparable spatial resolution, ∼ 0.3 (∼ 2 kpc). The radio emission is used as a tracer of the likely far-infrared morphology of these dusty, luminous galaxies. In ∼30% of the sample...

We have constructed a sample of radio-loud objects with optical spectroscopy from the Galaxy and Mass Assembly (GAMA) project over the Herschel-ATLAS Phase 1 fields. Classifying the radio sources in terms of their optical spectra, we find that strong-emission-line sources (‘high-excitation radio galaxies’) have, on average, a factor ∼ 4 higher 250-μm Herschel luminosity than weak-line (‘low-exc...

We present an analysis of the properties of optical counterparts of radio sources down to 1 mJy. Optical identifications have been obtained by matching together objects from the APM and FIRST surveys over the region 148.13◦ ∼ < RA(2000) ∼ < 218.13◦, −2.77◦ ∼ Dec ∼ 2.25 ◦. Selecting radio sources down to 1 mJy, and adopting a uniform optical limit of bJ = 21.5 we find 3176 have a counterpart in ...