Orbital Dependence of Galaxy Properties in Satellite Systems of Galaxies

Orbital evolution of the Carina dwarf galaxy and self-consistent star formation history determination

Orbital structure of merger remnants: Trends with gas fraction in 1:1 mergers

Orbiting Circum-galactic Gas as a Signature of Cosmological Accretion

ORCA: The Overdense Red-sequence Cluster Algorithm

Order statistics of the early-type galaxy luminosity function

Ordered magnetic fields around radio galaxies: evidence for interaction with the environment

Orientation effects in quasar spectra: The broad- and narrow-line regions

Orientation Effects on the Inner Region of Dusty Torus of Active Galactic Nuclei

Orientation of the galaxy groups in the Local Supercluster

Origami constraints on the initial-conditions arrangement of dark-matter caustics and streams

ORIGAMI: Delineating Halos using Phase-Space Folds

Origin and evolution of cosmic accelerators - the unique discovery potential of an UHE neutrino telescope: Astronomy Decadal Survey (2010-2020) Science White Paper

Origin and evolution of galactic spin from looking at galaxy pairs

Origin and Implications of high eccentricities in massive black hole binaries at sub-pc scales

Origin and Modelling of Cold Dark Matter Halo Properties: IV. Triaxial Ellipticity

Origin of Extended Star Clusters

Origin of optically passive spiral galaxies with dusty star-forming regions: Outside-in truncation of star formation?

Origin of rotational kinematics in the globular cluster system of M31: A new clue to the bulge formation

Origin of strong magnetic fields in Milky-Way like galactic haloes