\n Synthetic observational images of the first galaxies based on the simulations from Chen et al. These galaxies have irregular shapes and each of them has multiple bright spots showing the separating star forming regions. Credit: ASIAA\/Meng-Yuan Ho \n <\/figcaption><\/figure>\n<\/p><\/div>\n<\/div>\nIn contrast to the grand spiral structure of our Milky Way, these first galaxies exhibit irregular shapes without rotational support. Within their central regions, a few hundred to a few thousand second-generation stars (Pop II stars) can form. The metallicity of the gas in the first galaxies has been enriched to about 0.01 solar metallicity.<\/p>\n
The simulations also suggest that the first stars were not a predominant component of most first galaxies, as gas in massive halos was typically polluted by metals from other Pop III supernovae during hierarchical assembly before collapsing into pristine stars.<\/p>\n
These first galaxies are considered the landmark of the cosmic dawn, and their direct detection in the universe is a significant goal for the James Webb Space Telescope (JWST) and upcoming 30-meter-class ground-based telescopes. This finding provides a bridge between the demise of the first stars and the emergence of the first galaxies, offering valuable insights into the physics of the cosmic dawn.<\/p>\n
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More information:<\/strong> \n\t\t\t\t\t\t\t\t\t\t\t\tKe-Jung Chen et al, How Population III Supernovae Determined the Properties of the First Galaxies, The Astrophysical Journal<\/i> (2024). DOI: 10.3847\/1538-4357\/ad2684<\/p>\n<\/div>\n \t\t\t\t\t\t\t\t\t\t<\/p>\n
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\n\t\t\t\t\t\t\t\t\t\t\t\tCitation<\/strong>: \n\t\t\t\t\t\t\t\t\t\t\t\tUnveiling the formation of the first galaxies (2024, March 21) \n\t\t\t\t\t\t\t\t\t\t\t\tretrieved 21 March 2024 \n\t\t\t\t\t\t\t\t\t\t\t\tfrom\n\t\t\t\t\t\t\t\t\t\t\t <\/p>\n\n\t\t\t\t\t\t\t\t\t\t\t This document is subject to copyright. Apart from any fair dealing for the purpose of private study or research, no \n\t\t\t\t\t\t\t\t\t\t\t part may be reproduced without the written permission. The content is provided for information purposes only.\n\t\t\t\t\t\t\t\t\t\t\t <\/p>\n<\/p><\/div>\n<\/p><\/div>\n\n","protected":false},"excerpt":{"rendered":"
Metallicity distribution of the first supernovae at 10 million years after the explosion. The supernova ejecta (orange region) has expanded to a radius of 1 kpc and enriched the surrounding gas to metallicities of 10-4 to 10-2 solar metallicity. The background yellow stripes are the cosmic structure of dark matter. Credit: ASIAA\/Ke-Jung Chen Utilizing high-resolution …<\/p>\n","protected":false},"author":1,"featured_media":11620,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"nf_dc_page":"","footnotes":""},"categories":[8],"tags":[],"yoast_head":"\n
Unveiling the formation of the first galaxies - Innovation Discoveries<\/title>\n \n \n \n \n \n \n \n \n \n \n\t \n\t \n\t \n \n \n \n\t \n\t \n\t \n