Items filtered by date: September 2021

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Items filtered by date: September 2021

Massive Galaxies May be Crucial for the Enrichment of Cosmic Metal in the Early Universe

What are the sources of early metals and how did they enrich the intergalactic medium (IGM) are among the most crucial questions in galaxy formation. Most of the previous searches in optical wavelengths indicate that the enrichment of cosmic metals is due to low-mass galaxies that are fainter than the current detection limit. Here, we report the discovery of a galaxy associated with a strong OI absorber at redshift of 6. The galaxy has a halo mass of four hundred billion solar mass, one or two orders of magnitude more massive than that expected from modern cosmological simulations. Our observations indicate that massive galaxies may be more important in transporting metals in the intergalactic medium (IGM) than predicted by simulations.

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DoA faculty reviews the statistical distribution of exoplanets

How do planetary systems form and evolve? It is a scientific question that astronomers have long been wondering and also a key step toward understanding the origin of life and human beings on Earth. Since the discovery of the first planet orbiting around a Sun-like star outside of the Solar System in 1995 (which was awarded the Nobel Physics Prize in 2019), the number of known exoplanets has grown to over 4000. This large sample has enabled many detailed studies into the statistical distribution of planets and has sharpened our understanding of the planet formation process.

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