A Sloan Digital Sky Survey (SDSS) source sample containing 44,200 quasar redshifts is examined. Although arguments have been put forth to explain some of the structure observed in the redshift distribution, it is argued here that this structure may just as easily be explained by the presence of previously predicted preferred redshifts. Subject headings: galaxies: active galaxies: distances and ...

We identify nearby disk galaxies with optical structural parameters similar to those of intermediateredshift compact blue galaxies. By comparing H I and optical emission-line widths, we show that the optical widths substantially underestimate the true kinematic widths of the local galaxies. By analogy, optical emission-line widths may underrepresent the masses of intermediate-z compact objects....

We construct the first “face-on” Tully-Fisher (TF) relation for 24 galaxies with inclinations between 16◦ and 41◦. The enabling measurements are integralfield, echelle spectroscopy from the WIYN 3.5m telescope, which yield accurate kinematic estimates of disk inclination to ∼ 15◦. Kinematic inclinations are of sufficient accuracy that our measured TF scatter of 0.42 mag is comparable to other s...

We examine a possible supergroup in the direction of the Eridanus constellation using 6dF Galaxy Survey second data release (6dFGS DR2) positions and velocities together with 2MASS and HyperLEDA photometry. We perform a friends-of-friends analysis to determine which galaxies are associated with each substructure before examining the properties of the constituent galaxies. The overall structure ...

We have discovered a highly significant over-density of galaxies at z = 2.300± 0.015 in the course of a redshift survey designed to select star-forming galaxies in the redshift range z = 2.3± 0.4 in the field of the bright z = 2.72 QSO HS1700+643. The structure has a redshift-space galaxy over-density of δ g ≃ 7 and an estimated matter over-density in real space of δm ≃ 1.8, indicating that it ...

Most clusters and groups of galaxies contain a giant elliptical galaxy in their centres which far outshines and outweighs normal ellipticals. The origin of these brightest cluster galaxies is intimately related to the collapse and formation of the cluster. Using a large cosmological N-body simulation of cluster collapse, we show how hierarchical merging naturally produces a giant, central ellip...

Using dark matter halos traced by galaxy groups selected from the Sloan Digital Sky Survey Data Release 4, we find that about 1/4 of the faint galaxies ( Mr − 5 log h > −17.05, hereafter dwarfs) that are the central galaxies in their own halo are not blue and star forming, as expected in standard models of galaxy formation, but are red. Many red dwarf galaxies are physically associated with mor...