{"id":11174,"date":"2025-10-08T17:22:45","date_gmt":"2025-10-08T09:22:45","guid":{"rendered":"https:\/\/phys.nycu.edu.tw\/20251016speech\/"},"modified":"2025-10-08T17:26:39","modified_gmt":"2025-10-08T09:26:39","slug":"20251016speech","status":"publish","type":"post","link":"https:\/\/phys.nycu.edu.tw\/en\/20251016speech\/","title":{"rendered":"10\/16 Three years of searching for the most distant galaxies with JWST and what have we learned so far?"},"content":{"rendered":"<div class=\"entry-content\">\n<div class=\"entry-content\">\n<div class=\"entry-content\">\n<p>Time:\u30001:20pm~3:10pm, October 16 (Thursday)<\/p>\n<p>Title:\u3000Three years of searching for the most distant galaxies with JWST and what have we learned so far?<\/p>\n<p>Speaker: Dr. Aaron Yung, Giacconi Fellow<\/p>\n<p>Affiliation: Space Telescope Science Institute (STScI)<\/p>\n<p>Place: Science Building III\u00a0<strong>SC157<\/strong><\/p>\n<p>Abstract:<br \/>\nThe superb capabilities of the James Webb Space Telescope (JWST) have extended our view to the ultra-high-redshift universe (z &gt; 12). Among numerous scientific discoveries enabled by JWST, some early deep extragalactic observations have unexpectedly revealed an abundance of massive galaxies, presenting significant challenges to conventional galaxy formation models. To address this cosmic puzzle, we utilize some well-established galaxy formation models in conjunction with state-of-the-art cosmological simulations to seek understanding of physical mechanisms that enabled extremely rapid star formation activities in the early universe. We investigated and quantified the impact of various sources of uncertainty, including a potentially evolving mass-to-light ratio driven by changes in the IMF, underestimated field-to-field variance, and significant uncertainties in photometric redshifts, among others. Our study also examines the number density of halo populations during this epoch, alongside the gas cooling rates and star formation efficiencies of galaxies. I will also present new simulated results for various alternative star formation and stellar feedback models and discuss the essential conditions required to reproduce the observed ultra-high-redshift galaxy populations.<\/p>\n<\/div>\n<\/div>\n<\/div>\n","protected":false},"excerpt":{"rendered":"<p>Time:\u30001:20pm~3:10pm, October 16 (Thursday) Title:\u3000Three years of searching for the most distant galaxies with JWST and what have we learned so far? Speaker: Dr. Aaron Yung, Giacconi Fellow Affiliation: Space Telescope Science Institute (STScI) Place: Science Building III\u00a0SC157 Abstract: The superb capabilities of the James Webb Space Telescope (JWST) have extended our view to the [&hellip;]<\/p>\n","protected":false},"author":12,"featured_media":5023,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[126],"tags":[],"class_list":["post-11174","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-talk-activity"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v26.9 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>10\/16 Three years of searching for the most distant galaxies with JWST and what have we learned so far? - \u570b\u7acb\u967d\u660e\u4ea4\u901a\u5927\u5b78 \u7269\u7406\u7814\u7a76\u6240<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/phys.nycu.edu.tw\/en\/20251016speech\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"10\/16 Three years of searching for the most distant galaxies with JWST and what have we learned so far? - \u570b\u7acb\u967d\u660e\u4ea4\u901a\u5927\u5b78 \u7269\u7406\u7814\u7a76\u6240\" \/>\n<meta property=\"og:description\" content=\"Time:\u30001:20pm~3:10pm, October 16 (Thursday) Title:\u3000Three years of searching for the most distant galaxies with JWST and what have we learned so far? Speaker: Dr. Aaron Yung, Giacconi Fellow Affiliation: Space Telescope Science Institute (STScI) Place: Science Building III\u00a0SC157 Abstract: The superb capabilities of the James Webb Space Telescope (JWST) have extended our view to the [&hellip;]\" \/>\n<meta property=\"og:url\" content=\"https:\/\/phys.nycu.edu.tw\/en\/20251016speech\/\" \/>\n<meta property=\"og:site_name\" content=\"\u570b\u7acb\u967d\u660e\u4ea4\u901a\u5927\u5b78 \u7269\u7406\u7814\u7a76\u6240\" \/>\n<meta property=\"article:published_time\" content=\"2025-10-08T09:22:45+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2025-10-08T09:26:39+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/phys.nycu.edu.tw\/wp-content\/uploads\/2020\/12\/news02.jpg\" \/>\n\t<meta property=\"og:image:width\" content=\"1500\" \/>\n\t<meta property=\"og:image:height\" content=\"1000\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/jpeg\" \/>\n<meta name=\"author\" content=\"lcchen\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"lcchen\" \/>\n\t<meta name=\"twitter:label2\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data2\" content=\"2 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\/\/phys.nycu.edu.tw\/en\/20251016speech\/#article\",\"isPartOf\":{\"@id\":\"https:\/\/phys.nycu.edu.tw\/en\/20251016speech\/\"},\"author\":{\"name\":\"lcchen\",\"@id\":\"https:\/\/phys.nycu.edu.tw\/#\/schema\/person\/3b5aaa6112342ee6d482a592a23975e4\"},\"headline\":\"10\/16 Three years of searching for the most distant galaxies with JWST and what have we learned so far?\",\"datePublished\":\"2025-10-08T09:22:45+00:00\",\"dateModified\":\"2025-10-08T09:26:39+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\/\/phys.nycu.edu.tw\/en\/20251016speech\/\"},\"wordCount\":230,\"image\":{\"@id\":\"https:\/\/phys.nycu.edu.tw\/en\/20251016speech\/#primaryimage\"},\"thumbnailUrl\":\"https:\/\/phys.nycu.edu.tw\/wp-content\/uploads\/2020\/12\/news02.jpg\",\"articleSection\":[\"Talk\/Activity\"],\"inLanguage\":\"en-US\"},{\"@type\":\"WebPage\",\"@id\":\"https:\/\/phys.nycu.edu.tw\/en\/20251016speech\/\",\"url\":\"https:\/\/phys.nycu.edu.tw\/en\/20251016speech\/\",\"name\":\"10\/16 Three years of searching for the most distant galaxies with JWST and what have we learned so far? 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