We present HST/WFPC2 images, in narrow-band filters containing the [O III] 5007 and H +[N II] emissionlines and their adjacent continua, of a sample of seven Seyfert 2 galaxies selected on the basis of possessing either extended emission-line regions in ground-based observations or a hidden broad-line region in polarized light. Six of the galaxies have also been observed with the VLA to obtain ...

We have used the Very Large Array aperture synthesis telescope to conduct a radio continuum survey of polar-ring galaxies, at 20 cm and 6 cm. Forty objects were observed at 20 cm with ≃ 5 resolution. Twenty (50%) of the program sources were detected at 20 cm, down to our 5-σ limit of 0.5 mJy beam−1. This detection rate is similar to those in surveys with comparable sensitivity for early-type ga...

In previous papers we have discussed high-resolution observations of a large sample of powerful radio galaxies with z < 0.3. Jets are detected in up to 80 per cent of the sample, and radio cores in nearly all the objects; in addition, we are able to resolve the hot spots in most sources. In this paper we present measurements of the radio properties of these components. The prominences of the je...

Deep imaging and spectroscopy have been carried out for optical counterparts of a sample of 68 faint radio sources (S > 0.2 mJy) in the “Marano Field”. About 60% of the sources have been optically identified on deep CCD exposures (limit R ' 24.0) or ESO 3.6–m plates (limit bJ ' 22.5). Thirty–four spectra (50% of the total radio sample) were obtained with the ESO 3.6–m telescope and 30 redshifts...

We study a complete and distance-limited sample of 25 LINERs, 21 of which have been imaged with the Hubble Space Telescope. In nine objects we detect an unresolved nucleus. In order to study their physical properties, we compare the radio and optical properties of the nuclei of LINERs with those of other samples of local AGNs, namely Seyfert galaxies and low-luminosity radio galaxies (LLRG). Ou...

We have performed quasi-simultaneous radio flux density measurements at 2.7 and 10 GHz for all PG quasars with radio flux densities between 4-200 mJy. We find that a large fraction of these sources are variable, flat-spectrum quasars. This brings the total fraction of flat-spectrum quasars with a ratio between radio and optical flux of R > 10 — a value previously used to define a radio-loud qua...

A visual search has been made of four fields using United Kingdom 1.2m Schmidt Objective Prism plates with a reciprocal dispersion of 1 180 A/mm at HP. Such plate material is ideally suited to searches for emission-line galaxies. We present a catalogue of 53 emission-line objects, which comprises 45 galaxies, where individual HI1 regions are resolved in 16 bright galaxies; 8 are emission li...

A sample of 2712 radio–luminous galaxies is defined from the second data release of the Sloan Digital Sky Survey (SDSS) by cross–comparing the main spectroscopic galaxy sample with two radio surveys: the NRAO VLA Sky Survey (NVSS) and the Faint Images of the Radio Sky at Twenty centimetres (FIRST) survey. The comparison is carried out in a multi– stage process and makes optimal use of both radi...

Abell 2256 is a nearby (z ≈ 0.06), rich cluster of galaxies with fascinating observed properties across a range of wavelengths. Long believed to represent a cluster merger, recent X-ray and optical results have suggested that in addition to the primary cluster and subcluster there is evidence for a third, poorer system. We present wide-field, high sensitivity 1.4 GHz VLA radio observations of A...