天文学者チームがジェイムズ・ウェッブ宇宙望遠鏡を使用し、ビッグバンから20億年以内に形成された、回転が見られない巨大な銀河を特定した。この発見は、従来の銀河進化モデルに疑問を投げかけている。
「XMM-VID1-2075」と名付けられたこの銀河には、天の川銀河の数倍もの星が含まれており、すでに新たな星の形成は止まっている。研究を主導したカリフォルニア大学デービス校のベン・フォレスト氏は、このような初期の天体において回転が見られないことは驚きであり、予想外であったと述べている。
Astronomers using the James Webb Space Telescope have identified the farthest jellyfish galaxy observed to date, located at a redshift of z=1.156. This galaxy, viewed as it appeared 8.5 billion years ago, features trailing streams of gas and young stars shaped by ram-pressure stripping in a dense cluster. The finding suggests that early universe galaxy clusters were more turbulent than previously thought.
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A galaxy named Hebe, observed 400 million years after the Big Bang, shows evidence of pristine Population III stars formed solely from hydrogen and helium. Researchers led by Roberto Maiolino at the University of Cambridge used the James Webb Space Telescope to confirm spectral lines indicating extremely hot, massive stars. The finding offers insights into the early universe's star formation.
Astronomers have found evidence suggesting that the Sun participated in a large-scale migration of similar stars from the Milky Way's inner regions about 4 to 6 billion years ago. This movement likely carried the solar system to a calmer part of the galaxy. The discovery comes from a detailed study of solar twins using data from the European Space Agency's Gaia satellite.
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Astronomers have produced a detailed map of the Milky Way's magnetic field, revealing a surprising diagonal reversal in the Sagittarius Arm. The findings, based on new radio telescope data, help explain how this invisible force structures the galaxy. Led by scientists at the University of Calgary, the studies were published this month in The Astrophysical Journal.