The authors investigate the fraction of massive galaxies at z ~ 2 that contains an Active Galactic Nucleus (AGN), in hopes of understanding the importance of AGN in quenching star formation.
New observations at infrared background find a mysterious background glow on the sky, which is inconsistent with the previously proposed models for its origin. The authors suggest that the infrared glow could be coming from rogue stars that have been expelled from host galaxies out into the dark matter halos that surround galaxies.
The authors report on a young, Sun-like star with a debris disk of dust and larger rocks that has had the dust particles mysteriously vanish from the disk in a span of less than two years.
The authors discover a strong lensing arc behind an unusually massive galaxy cluster at high redshift. The existence of such a lensing system at high redshift is found to be inconsistent with the standard cosmological model.
The first science results from ALMA include remarkable images of the dust ring encircling the notorious Fomalhaut. Modeling of the ring’s morphology suggests the existence of two planets, each with a mass comparable to the mass of the Earth.