{"id":242344,"date":"2026-08-07T01:26:08","date_gmt":"2026-08-07T06:26:08","guid":{"rendered":"https:\/\/lifeboat.com\/blog\/2026\/08\/jwst-study-suggests-a-handful-of-leaky-galaxies-reionized-the-early-universe"},"modified":"2026-08-07T01:26:08","modified_gmt":"2026-08-07T06:26:08","slug":"jwst-study-suggests-a-handful-of-leaky-galaxies-reionized-the-early-universe","status":"publish","type":"post","link":"https:\/\/lifeboat.com\/blog\/2026\/08\/jwst-study-suggests-a-handful-of-leaky-galaxies-reionized-the-early-universe","title":{"rendered":"JWST study suggests a handful of \u2018leaky\u2019 galaxies reionized the early universe"},"content":{"rendered":"<p><a class=\"aligncenter blog-photo\" href=\"https:\/\/lifeboat.com\/blog.images\/jwst-study-suggests-a-handful-of-leaky-galaxies-reionized-the-early-universe.jpg\"><\/a><\/p>\n<p>A new study analyzing the James Webb Space Telescope (JWST) spectra of more than 1,400 galaxies suggests a surprisingly small group of \u201cleaky\u201d galaxies was responsible for cosmic reionization. The <a href=\"https:\/\/arxiv.org\/abs\/2607.22834\" target=\"_blank\">paper<\/a> outlining this work was posted to the <i>arXiv<\/i> preprint server on July 24.<\/p>\n<p>Cosmic reionization happened when ionizing ultraviolet radiation from early stars and galaxies heated the universe\u2019s neutral hydrogen gas and converted it into the ionized state seen today. Based on cosmic microwave background and quasar data, this epoch is estimated to have occurred around redshift 6\u20138, roughly 600 million to 1 billion years after the Big Bang. The main driver is thought to be star-forming galaxies. Therefore, the epoch of reionization is considered the last major phase transition of the universe.<\/p>\n<p>The ultraviolet radiation responsible for cosmic reionization is mainly composed of Lyman continuum (LyC) photons with wavelengths less than 912 \u00c5. Their escape fraction from galaxies, along with the rate of their production, determines whether they reach and ionize the intergalactic medium because most LyC photons are absorbed internally by gas and dust.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>A new study analyzing the James Webb Space Telescope (JWST) spectra of more than 1,400 galaxies suggests a surprisingly small group of \u201cleaky\u201d galaxies was responsible for cosmic reionization. The paper outlining this work was posted to the arXiv preprint server on July 24. Cosmic reionization happened when ionizing ultraviolet radiation from early stars and [\u2026]<\/p>\n","protected":false},"author":427,"featured_media":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[33],"tags":[],"class_list":["post-242344","post","type-post","status-publish","format-standard","hentry","category-cosmology"],"_links":{"self":[{"href":"https:\/\/lifeboat.com\/blog\/wp-json\/wp\/v2\/posts\/242344","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/lifeboat.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/lifeboat.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/lifeboat.com\/blog\/wp-json\/wp\/v2\/users\/427"}],"replies":[{"embeddable":true,"href":"https:\/\/lifeboat.com\/blog\/wp-json\/wp\/v2\/comments?post=242344"}],"version-history":[{"count":0,"href":"https:\/\/lifeboat.com\/blog\/wp-json\/wp\/v2\/posts\/242344\/revisions"}],"wp:attachment":[{"href":"https:\/\/lifeboat.com\/blog\/wp-json\/wp\/v2\/media?parent=242344"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/lifeboat.com\/blog\/wp-json\/wp\/v2\/categories?post=242344"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/lifeboat.com\/blog\/wp-json\/wp\/v2\/tags?post=242344"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}