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Science News & Journal club

Science News内容:

  题目:JWST and Chandra Discover Record-Breaking Black Hole

  摘要:Astronomers have discovered the most distant black hole yet seen in X-rays, using NASA telescopes. By combining data from NASA’s Chandra X-ray Observatory and NASA’s James Webb Space Telescope, a team of researchers was able to find the signature of a growing black hole just 470 million years after the big bang. The black hole is at an early stage of growth that had never been witnessed before, where its mass is similar to that of its host galaxy. This result may explain how some of the first supermassive black holes in the universe formed.

  报告人:韩园珍(紫台研究生)

Journal club内容:

  题目:Super-early JWST galaxies, outflows and lyα visibility in the EoR

  摘要:The overabundance of super-early (redshift z > 10), luminous, and blue galaxies detected by JWST has been explained as due to negligible dust attenuation in these systems. The paper show that such model correctly reproduces the UV luminosity function at z > 10, and the star formation rate (SFR) density evolution. The model also predict fraction of galaxies that are in the super-Eddington regime increases with redshift. This prediction is consistent with the outflow velocities measured in 12 super-Eddington galaxies of the JWST/JADES sample.They also dramatically enhance the visibility of the Lyα line from z > 10 galaxies.

  报告人:许明轩(紫台研究生)

  时间:2023年11月28日12:15

  地点:紫台3-302

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