The Origins of a Rich Absorption Line Complex in a Quasar at Redshift 3.45
The Origins of AGN Obscuration: The 'Torus' as a Dynamical, Unstable Driver of Accretion
The orthogonal fitting procedure for determination of the empirical Σ - D relations for supernova remnants: application to starburst galaxy M82
The other side of Bulge Formation in a Lambda-CDM cosmology: Bulgeless Galaxies in the Local Universe
The Outer Disks of Dwarf Irregular Galaxies
The Outer Disks of Early-Type Galaxies. II. Surface-Brightness Profiles of Unbarred Galaxies and Trends with Hubble Type
The Outer Halo Globular Clusters of M31
The Outer Limits of Galaxy Clusters: Observations to the Virial Radius with Suzaku, XMM, and Chandra
The outflow in Mrk 509: A method to calibrate XMM-Newton EPIC-pn and RGS
The outskirts of globular clusters as modified gravity probes
The overdensity and masses of the friends-of-friends halos and universality of the halo mass function
The Padova-Millennium Galaxy and Group Catalogue (PM2GC): the group-finding method and the PM2GC catalogues of group, binary and single field galaxies
The Pair Fraction of Massive Galaxies at 0 < z < 3
The pairwise velocity probability density function in models with local primordial non-Gaussianity
The Panchromatic Hubble Andromeda Treasury
The Parameter Space of Galaxy Formation
The Parity Odd Universe, Dark Energy and QCD
The Parkes Galactic Meridian Survey (PGMS): observations and CMB polarization foreground analysis
The parsec-scale jet of PKS 1749+096
The parsec-scale properties of the radio galaxy 4C 26.42 in the dense cooling core cluster A1795