The biggest and the brightest Lyα nebula is discovered! What can we learn from this giant?
Observations of dwarf galaxies show that sites of active star formation have fewer metals. These galaxies may have been diluted by the impact of pristine gas from the cosmic web.
Gamma-ray bursts are the most energetic explosions in the Universe. Today, we discuss how to use one GRB as a beacon to study the properties of a high redshift galaxy, the composition of the gas in the intergalactic medium at high redshift and the formation of dust in the Universe.
Our special guest astrophysical classics series on Gunn & Peterson 1965 concludes with an examination — and apprehension — of the suspects responsible for reionization.
Gas in the Universe went from being mostly neutral to mostly ionized as the first galaxies formed, and the signature of this process is imprinted in quasar spectra. The review of the classic paper by Gunn & Peterson continues in this second in the three-part series.
This guest post, the first in a three-part series, reviews the classic article by Gunn & Peterson (1965). This paper proposed several fundamental ideas in cosmology, including using distant quasars as “flashlights” to observe the diffuse gas between galaxies.