Discovery of a Faint Quasar at z=6: Illumination of the Early Universe by Quasars

Discovery of a Faint Quasar at z=6: Illumination of the Early Universe by Quasars     A team of Korean astronomers discovered a faint quasar in the early Universe which sheds light on the main sources of illumination about 1 billion years after the Big Bang. The team used the Gemini South telescope in Chile, […]

Recent Developments in Gaseous Galaxy Halos

Galaxies like the Milky Way are surrounded by large halos of hot gas (a few million degrees) that may contain about half of the baryons "missing" from the disk. Cooling from these halos could provide most of the fuel for star formation over the history of the Universe, but many uncertainties remain, including how this […]