The OH line contamination of 21 cm intensity fluctuation measurements for z=1~4
The old and heavy bulge of M31 I. Kinematics and stellar populations
The ongoing assembly of a central cluster galaxy: Phase-space substructures in the halo of M87
The onset of star formation in primordial haloes
The Opacity of Galactic Disks at z~0.7
The optical afterglows and host galaxies of three short/hard gamma-ray bursts
The Optical Depth of H II Regions in the Magellanic Clouds
The optical morphologies of the 2Jy sample of radio galaxies: evidence for galaxy interactions
The optical spectra of Spitzer 24 micron galaxies in the COSMOS field: II. Faint infrared sources in the zCOSMOS-bright 10k catalogue
The optical spectra of X-shaped radio galaxies
The Optical Structure of the Starburst Galaxy M82. II. Nebular Properties of the Disk and Inner-Wind
The optical variability of flat-spectrum radio quasars in the SDSS stripe 82 region
The optical variability of steep-spectrum radio quasars in the SDSS Stripe 82 region
The Optical, Ultraviolet, and X-ray Structure of the Quasar HE 0435-1223
The optical-UV spectral energy distribution of the unabsorbed AGN population in the XMM-Newton Bright Serendipitous Survey
The Optimal Cosmic Epoch for Precision Cosmology
The optimal redshift for detecting ionized bubbles in HI 21-cm maps
The optimal weighting function for cosmic magnification measurement through foreground galaxy-background galaxy (quasar) cross correlation
The OPTX Project II: Hard X-ray Luminosity Functions of Active Galactic Nuclei for z<5
The OPTX Project III: X-ray versus Optical Spectral Type for AGNs