The study of the optical continuum of radio galaxies shows that about 30% have a young stellar population component. Among them are the most far-IR bright radio galaxies. A further indication of the relatively gas rich environment of these galaxies (possibly related to the recent merger from which they originate) is the high fraction being detected in H I. Here we present recent results obtaine...

We identify eight z > 1 radio sources undetected at 850 μm but robustly detected at 70 μm, confirming that they represent ultraluminous infrared galaxies (ULIRGs) with hotter dust temperatures (〈T d〉 = 52 ± 10 K) than submillimetre galaxies (SMGs) at similar luminosities and redshifts. These galaxies share many properties with SMGs: ultraviolet spectra consistent with starbursts, high stellar m...

We present the results of spectropolarimetry of a sample of 7 powerful radio galaxies and 2 quasars with 0.07 < z < 0.35 obtained to detect possible anisotropies in the [OIII] line emission, which could explain the higher [OIII] luminosity of quasars than that of radio galaxies within the framework of the Unified Model of radio-loud AGN. We detect polarized [OIII] in 4 radio galaxies, consisten...

Large-scale (up to 100 kpc) H I structures have been found in three radio galaxies using the WSRT and the VLA. In one case, the H I has been detected in emission while in the other two H I absorption is detected against the radio lobes. In at least two of the three studied radio galaxies the H I appears to be distributed in a large disk and the large amount of neutral gas detected (> ∼ 10 M⊙) i...

We present the results of spectropolarimetry of a sample of 7 powerful radio galaxies and 2 quasars with 0.07 < z < 0.35 obtained to detect possible anisotropies in the [OIII] line emission, which could explain the higher [OIII] luminosity of quasars than that of radio galaxies within the framework of the Unified Model of radio-loud AGN. We detect polarized [OIII] in 4 radio galaxies, consisten...

We present RIJHK imaging of seven radio galaxies from the 7C Redshift Survey (7CRS) which lack strong emission lines and we use these data to investigate their spectral energy distributions (SEDs) with models which constrain their redshifts. Six of these seven galaxies have extremely red colours (R − K > 5.5) and we find that almost all of them lie in the redshift range 1 < z < 2. We also prese...

We present two–dimensional slab–jet simulations of jets in inhomogeneous media consisting of a tenuous hot medium populated with a small filling factor by warm, dense clouds. The simulations are relevant to the structure and dynamics of sources such as Gigahertz Peak Spectrum and Compact Steep Spectrum radio galaxies, High Redshift Radio Galaxies and radio galaxies in cooling flows. The jets ar...

We investigate how the total radio luminosity of AGN-powered radio sources depends on their accretion luminosity and the central black hole mass. We find that AGNs form two distinct and well separated sequences on the radio-loudness — Eddington-ratio plane. We argue that these sequences mark the real upper bounds of radio-loudness of two distinct populations of AGNs: those hosted respectively b...

We present the first deep VLA radio images of flat-spectrum radio quasars (FSRQ) with multiwavelength emission properties similar to those of BL Lacs with synchrotron X-rays. Our observations of twenty-five of these sources show that their radio morphologies are similar to those of other radio quasars. However, their range of extended powers is more similar to that of BL Lacertae objects (BL La...

We present simultaneous, sub-arcsecond (≤ 50 pc) resolution 5 GHz, 8.4 GHz, and 15 GHz VLAa observations of a well-defined sample of sixteen low-luminosity active galactic nuclei (LLAGNs). The radio emission in most of these nuclei does not show the rising spectrum (0.2. s . 1.3, Lν ∝ νs) expected from thermal electrons in an advection dominated accretion flow (ADAF) with or without weak to mod...