{"id":36311,"date":"2026-07-05T22:28:21","date_gmt":"2026-07-05T20:28:21","guid":{"rendered":"https:\/\/www.chinasmartbuy.com\/blog\/jwst-m1149-bsg-z5-galassia-barrata-redshift-5\/"},"modified":"2026-07-05T22:28:22","modified_gmt":"2026-07-05T20:28:22","slug":"jwst-m1149-bsg-z5-galassia-barrata-redshift-5","status":"publish","type":"post","link":"https:\/\/www.chinasmartbuy.com\/blog\/jwst-m1149-bsg-z5-galassia-barrata-redshift-5\/","title":{"rendered":"JWST scopre M1149-BSG-z5, la galassia barrata pi\u00f9 lontana nota"},"content":{"rendered":"\n<link href=\"https:\/\/fonts.googleapis.com\/css2?family=Bebas+Neue&amp;family=DM+Sans:ital,wght@0,300;0,400;0,500;0,600;0,700;1,400&amp;display=swap\" rel=\"stylesheet\">\n<style>\n  :root {\n    --red: #CC1B1B;\n    --red-light: rgba(204,27,27,0.08);\n    --red-mid: #e84040;\n    --accent-soft-bg: rgba(204,27,27,0.07);\n    --accent-soft-border: rgba(204,27,27,0.18);\n    --text: #1a1a1a;\n    --text-muted: #666;\n    --card: #ffffff;\n    --border: #ebebeb;\n    --page-bg: #ffffff;\n    --surface-soft: #fafafa;\n    --surface-contrast: #f0f0f0;\n    --line-soft: #f5f5f5;\n    --soft-label: #bbb;\n    --muted-label: #999;\n    --copy: #333;\n    --font-head: 'Bebas Neue', sans-serif;\n    --font-body: 'DM Sans', sans-serif;\n    --heading-spacing: 0.04em;\n    --heading-weight: 400;\n    --spec-header-spacing: 0.08em;\n    --quickfacts-shadow: 0 10px 24px rgba(15,23,42,0.06);\n  }\n  .fbp5-wrap,.fbp5-wrap * { box-sizing:border-box; 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gap:40px; }\n    .fbp5-section h2 { font-size:32px; }\n    .fbp5-scheda-row { flex-direction:column; }\n    .fbp5-scheda-key { width:100%; }\n    .rh-phonebox-header { padding:18px 16px; flex-direction:column; align-items:center; }\n    .rh-phonebox-hero { width:150px; height:200px; }\n    .rh-phonebox-highlights { grid-template-columns:repeat(2,minmax(0,1fr)); }\n    .rh-phonebox-colors { padding:16px; }\n    .rh-phonebox-section { grid-template-columns:1fr; }\n    .rh-phonebox-section-label { padding:14px 20px; border-right:none; border-bottom:1px solid var(--border); }\n    .rh-phonebox-section-values { padding:14px 20px; }\n    .rh-affbox-grid { grid-template-columns:1fr; }\n    .rh-affbox-col:not(:last-child) { border-right:none; border-bottom:1px solid var(--line-soft); }\n    .rh-affbox-cta { width:100%; }\n    .rh-downloadjump { align-items:flex-start; flex-direction:column; margin:-22px 0 0; }\n    .rh-downloadjump a { width:100%; }\n    .rh-downloadbox-head { flex-direction:column; }\n    .rh-downloadbox-link { width:100%; }\n    .rh-offerbox-head { flex-direction:column; }\n    .rh-offerbox-links { grid-template-columns:1fr; }\n    .rh-offer-inline-wrap { flex-direction:column; align-items:flex-start; }\n    .rh-offer-inline-cta { width:100%; }\n  }\n<\/style>\n<div class=\"fbp5-wrap rh-json-article\" id=\"rh-article-mr88tge7-n7yhv\" data-rh-article-type=\"news\" data-rh-site-profile=\"china-smart-buy\">\n  <div class=\"fbp5-intro\">\n    \n    <p>Il James Webb Space Telescope ha permesso di identificare una nuova galassia a spirale barrata massiccia, chiamata <strong>M1149-BSG-z5<\/strong>, che con un redshift di <strong>5,1<\/strong> stabilisce il record attuale per questa categoria.<\/p><p>La scoperta \u00e8 interessante perch\u00e9 le galassie barrate sono comuni nell\u2019universo vicino, ma molto pi\u00f9 difficili da osservare in epoche cosmiche cos\u00ec antiche. Per questo motivo M1149-BSG-z5 diventa un riferimento utile per testare i modelli di formazione ed evoluzione delle galassie.<\/p>\n  <\/div><figure class=\"wp-block-image size-large\" style=\"margin:18px 0;display:block;clear:both;width:100%;position:relative;z-index:1\"><a href=\"https:\/\/www.chinasmartbuy.com\/blog\/wp-content\/uploads\/2026\/07\/jwst-scopre-m1149-bsg-z5-db311f2d-778d-47e1-9a5c-fc76-nbijvwflby.webp\" target=\"_blank\" rel=\"noopener\" style=\"display:block;width:100%;position:relative;z-index:2;pointer-events:auto;cursor:zoom-in\"><img decoding=\"async\" src=\"https:\/\/www.chinasmartbuy.com\/blog\/wp-content\/uploads\/2026\/07\/jwst-scopre-m1149-bsg-z5-db311f2d-778d-47e1-9a5c-fc76-nbijvwflby.webp\" alt=\"\u5df2\u77e5\u7ea2\u79fb\u503c\u6700\u9ad8\u7684\u68d2\u65cb\u661f\u7cfb\uff1aM1149-BSG-z5 \u88ab\u53d1\u73b0\uff0c\u7ea2\u79fb 5.1\" loading=\"lazy\" style=\"display:block;max-width:100%;height:auto;margin:0 auto;pointer-events:auto\"><\/a><\/figure>\n  \n\n      <section class=\"fbp5-section\">\n        <div class=\"fbp5-section-label\">Scoperta<\/div>\n        <h2>M1149-BSG-z5 \u00e8 la galassia barrata con il redshift pi\u00f9 <span>alto finora noto<\/span><\/h2>\n        <p>Lo studio, pubblicato come preprint su arXiv il 23 giugno e firmato come primo autore da Wang Xiaohan della Tsinghua University, descrive una galassia con struttura barrata ben riconoscibile gi\u00e0 in una fase molto precoce della storia cosmica. Il dato chiave \u00e8 il redshift <strong>5,1<\/strong>, che colloca M1149-BSG-z5 tra gli oggetti pi\u00f9 remoti della sua classe mai osservati.<\/p><p>Una galassia barrata \u00e8 una galassia a spirale con una struttura centrale allungata di stelle che collega la regione interna ai bracci. Questa configurazione \u00e8 importante perch\u00e9 aiuta a studiare il trasporto di materia all\u2019interno della galassia e i processi di evoluzione su lunga scala temporale.<\/p>\n        <ul class=\"fbp5-bullet-list\"><li>Redshift misurato: <strong>5,1<\/strong><\/li><li>Tipologia: galassia a spirale barrata massiccia<\/li><li>Osservazione resa possibile dal <strong>James Webb Space Telescope<\/strong><\/li><li>La scoperta \u00e8 utile per verificare i modelli di formazione galattica nell\u2019universo primordiale<\/li><\/ul>\n        <div class=\"rh-quickfacts-grid\">\n      <div class=\"rh-quickfacts-card\">\n        <div class=\"rh-quickfacts-label\">Nome<\/div>\n        <div class=\"rh-quickfacts-value\">M1149-BSG-z5<\/div>\n      <\/div>\n    \n      <div class=\"rh-quickfacts-card\">\n        <div class=\"rh-quickfacts-label\">Piattaforma dello studio<\/div>\n        <div class=\"rh-quickfacts-value\">arXiv<\/div>\n      <\/div>\n    \n      <div class=\"rh-quickfacts-card\">\n        <div class=\"rh-quickfacts-label\">Primo autore<\/div>\n        <div class=\"rh-quickfacts-value\">Wang Xiaohan<\/div>\n      <\/div>\n    \n      <div class=\"rh-quickfacts-card\">\n        <div class=\"rh-quickfacts-label\">Ambito scientifico<\/div>\n        <div class=\"rh-quickfacts-value\">Formazione ed evoluzione delle galassie<\/div>\n      <\/div>\n    <\/div>\n        <div class=\"fbp5-highlight\">Il punto centrale della scoperta \u00e8 che una struttura barrata ben sviluppata \u00e8 stata osservata in un\u2019epoca cosmica molto antica.<\/div>\n        <div class=\"fbp5-info\">Le galassie barrate ad alto redshift sono rare e per questo hanno un peso scientifico particolare.<\/div>\n        \n      <div class=\"fbp5-scheda\">\n        <div class=\"fbp5-scheda-header\">Dati chiave della scoperta<\/div>\n        \n          <div class=\"fbp5-scheda-row\">\n            <div class=\"fbp5-scheda-key\">Redshift<\/div>\n            <div class=\"fbp5-scheda-val\">5,1<\/div>\n          <\/div>\n        \n          <div class=\"fbp5-scheda-row\">\n            <div class=\"fbp5-scheda-key\">Categoria<\/div>\n            <div class=\"fbp5-scheda-val\">Galassia a spirale barrata<\/div>\n          <\/div>\n        \n          <div class=\"fbp5-scheda-row\">\n            <div class=\"fbp5-scheda-key\">Record attuale<\/div>\n            <div class=\"fbp5-scheda-val\">Pi\u00f9 alto redshift noto per una galassia barrata<\/div>\n          <\/div>\n        \n          <div class=\"fbp5-scheda-row\">\n            <div class=\"fbp5-scheda-key\">Strumento di osservazione<\/div>\n            <div class=\"fbp5-scheda-val\">James Webb Space Telescope<\/div>\n          <\/div>\n        \n      <\/div>\n    \n      <\/section>\n    \n\n      <section class=\"fbp5-section\">\n        <div class=\"fbp5-section-label\">Struttura<\/div>\n        <h2>Dimensioni, massa e attivit\u00e0 interna mostrano una galassia <span>gi\u00e0 molto evoluta<\/span><\/h2>\n        <p>M1149-BSG-z5 presenta una barra stellare lunga circa <strong>14.700 anni luce<\/strong>, un raggio efficace di circa <strong>8.500 anni luce<\/strong> e bracci di spirale che si estendono fino a un raggio di circa <strong>17.900 anni luce<\/strong>. Si tratta quindi di una struttura gi\u00e0 ampia e organizzata, nonostante l\u2019epoca molto antica in cui viene osservata.<\/p><p>La massa stimata della galassia \u00e8 di circa <strong>28 miliardi di masse solari<\/strong>, mentre il tasso di formazione stellare arriva a circa <strong>144 masse solari all\u2019anno<\/strong>. \u00c8 presente anche un nucleo galattico attivo, con un rapporto tra massa del buco nero e massa stellare relativamente basso, pari a circa <strong>0,001<\/strong>. La metallicit\u00e0 \u00e8 stimata intorno al <strong>50% di quella solare<\/strong>.<\/p>\n        <ul class=\"fbp5-bullet-list\"><li>Lunghezza della barra stellare: <strong>14.700 anni luce<\/strong><\/li><li>Raggio efficace: 8.500 anni luce<\/li><li>Estensione dei bracci: 17.900 anni luce di raggio<\/li><li>Massa totale stimata: 28 miliardi di masse solari<\/li><li>Tasso di formazione stellare: 144 masse solari l\u2019anno<\/li><li>Presenza di un nucleo galattico attivo con rapporto buco nero-massa stellare di 0,001<\/li><\/ul>\n        <div class=\"rh-quickfacts-grid\">\n      <div class=\"rh-quickfacts-card\">\n        <div class=\"rh-quickfacts-label\">Metallicit\u00e0<\/div>\n        <div class=\"rh-quickfacts-value\">Circa il 50% di quella del Sole<\/div>\n      <\/div>\n    \n      <div class=\"rh-quickfacts-card\">\n        <div class=\"rh-quickfacts-label\">AGN<\/div>\n        <div class=\"rh-quickfacts-value\">Presente<\/div>\n      <\/div>\n    <\/div>\n        <div class=\"fbp5-highlight\">La combinazione tra massa elevata, barra stellare ben definita e forte formazione stellare suggerisce una galassia sorprendentemente matura per il suo tempo cosmico.<\/div>\n        <div class=\"fbp5-info\">La presenza di una barra in un ambiente cos\u00ec remoto rende M1149-BSG-z5 un caso utile per capire quando e come queste strutture iniziano a formarsi.<\/div>\n        \n      <div class=\"fbp5-scheda\">\n        <div class=\"fbp5-scheda-header\">Parametri fisici principali<\/div>\n        \n          <div class=\"fbp5-scheda-row\">\n            <div class=\"fbp5-scheda-key\">Lunghezza barra stellare<\/div>\n            <div class=\"fbp5-scheda-val\">Circa 14.700 anni luce<\/div>\n          <\/div>\n        \n          <div class=\"fbp5-scheda-row\">\n            <div class=\"fbp5-scheda-key\">Raggio efficace<\/div>\n            <div class=\"fbp5-scheda-val\">Circa 8.500 anni luce<\/div>\n          <\/div>\n        \n          <div class=\"fbp5-scheda-row\">\n            <div class=\"fbp5-scheda-key\">Raggio dei bracci di spirale<\/div>\n            <div class=\"fbp5-scheda-val\">Circa 17.900 anni luce<\/div>\n          <\/div>\n        \n          <div class=\"fbp5-scheda-row\">\n            <div class=\"fbp5-scheda-key\">Massa stimata<\/div>\n            <div class=\"fbp5-scheda-val\">28 miliardi di masse solari<\/div>\n          <\/div>\n        \n          <div class=\"fbp5-scheda-row\">\n            <div class=\"fbp5-scheda-key\">Formazione stellare<\/div>\n            <div class=\"fbp5-scheda-val\">144 masse solari per anno<\/div>\n          <\/div>\n        \n          <div class=\"fbp5-scheda-row\">\n            <div class=\"fbp5-scheda-key\">Metallicit\u00e0<\/div>\n            <div class=\"fbp5-scheda-val\">Circa 50% del valore solare<\/div>\n          <\/div>\n        \n      <\/div>\n    \n      <\/section>\n    \n<\/div><div class=\"rh-attribution-pills\" 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