A large quasar group (LQG) of particularly large size and high membership has been
identified in the DR7QSO catalogue of the Sloan Digital Sky Survey. It has characteristic size
(volume1/3)∼ 500 Mpc (proper size, present epoch), longest dimension∼ 1240 Mpc …

We have found evidence for a large, elongated group of at least ten quasars with largest
dimension Mpc at z~ 1.3, in the direction of ESO/SERC field 927, which has the field centre
(1950) There are probably further members that have not yet been observed. The …

The new technique of automated quasar detection (AQD) is described. It is essentially
computer software which runs on STARLINK and selects quasars according to specified
selection criteria from COSMOS mapping mode data of, in this case, an objective-prism plate …

Identifications are given of IRAS point sources in a 304 deg2 area centred on the South
Galactic Pole. The positions and magnitudes of identification candidates were obtained
using 10 UK Schmidt Telescope IIIa-J plates, which were measured by the automatic high …

We describe a graph theoretical method, using the minimal spanning tree (MST), for finding
candidates for quasar superstructures in quasar surveys. The morphology of the candidate
can be characterized by the normalized mean, m, and normalized standard deviation, σ, of …

From direct spectroscopic observations of the Lyman-limit region in 32 QSOs, 19 of which
are described here, we find that the covering factor for large absorbing clouds in the
emission region is likely to be. Under these circumstances, it is unlikely that the mechanism …

A sample of optically-selected quasar candidates is presented. The candidates were
discovered on the UKST objective-prism plate UJ3682P, centred at (1950) 00 53,− 28 03
and containing the South Galactic Pole. There are 162 candidates in the central square of …

The paper shows how the selection effects in detection that operate in spectral searches for
quasars may be quantified and the quantification is tested with data from the CTIO-4m grism
and the Curtis Schmidt objective-prism surveys. The quantification leads to an explanation of …

Mon. Not. R. astr. Soc. (1989) 236, 425-446 The relationship between the radio and far-infrared
emission in IRAS galaxies: VLA observations of a large well-defined sample at 1420 MHz SW
Unger,1 RD Wolstencroft,2 A. Pedlar,3 A. Savage,2'4 RG Clowes,2 SK Leggett5 and QA Parker2 …

We report the results of an extensive set of optical and near-infrared photometry and
spectroscopy of the double infrared source reported by Hartmann et al.(1995) as a potential
counterpart for the Galatic soft gamma-ray repeater SGR 1900+ 14. These objects are found …