{"id":4160,"date":"2023-06-20T10:00:00","date_gmt":"2023-06-20T01:00:00","guid":{"rendered":"https:\/\/sci.nao.ac.jp\/main\/?p=4160"},"modified":"2023-06-20T13:39:59","modified_gmt":"2023-06-20T04:39:59","slug":"20230620","status":"publish","type":"post","link":"https:\/\/sci.nao.ac.jp\/main\/en\/highlights-en\/20230620","title":{"rendered":"Observations of High-Mass Star Seeds Defy Models"},"content":{"rendered":"\n<p>The international team led by Kaho Morii (The University of Tokyo\/NAOJ), Patricio Sanhueza, and Fumitaka Nakamura (NAOJ) has&nbsp;mapped 39 interstellar clouds where high-mass stars&nbsp;(stars with masses eight times more than the Sun)&nbsp;&nbsp;are expected to form.&nbsp;This large sample allows the team to shed light on a difficult-to-explore area of astrophysics, offering valuable insights into the initial phases of high-mass star and cluster formation. The team investigated the mass, density, and distribution of these stellar seeds within clouds, which shows that the accepted model of low-mass star formation needs to be expanded to explain the formation of high-mass stars.&nbsp;<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"853\" src=\"https:\/\/sci.nao.ac.jp\/main\/wp-content\/uploads\/2023\/06\/Fig1_Morii-1024x853.jpg\" alt=\"\" class=\"wp-image-4157\" srcset=\"https:\/\/sci.nao.ac.jp\/main\/wp-content\/uploads\/2023\/06\/Fig1_Morii-1024x853.jpg 1024w, https:\/\/sci.nao.ac.jp\/main\/wp-content\/uploads\/2023\/06\/Fig1_Morii-300x250.jpg 300w, https:\/\/sci.nao.ac.jp\/main\/wp-content\/uploads\/2023\/06\/Fig1_Morii-768x640.jpg 768w, https:\/\/sci.nao.ac.jp\/main\/wp-content\/uploads\/2023\/06\/Fig1_Morii-1536x1280.jpg 1536w, https:\/\/sci.nao.ac.jp\/main\/wp-content\/uploads\/2023\/06\/Fig1_Morii-2048x1707.jpg 2048w, https:\/\/sci.nao.ac.jp\/main\/wp-content\/uploads\/2023\/06\/Fig1_Morii-264x220.jpg 264w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><figcaption class=\"wp-element-caption\">Figure 1: An artist\u2019s view on the internal structure of an infrared dark cloud revealed by&nbsp; ALMA. The raw material for star formation&nbsp;consists of gas and dust. Here, the densest regions are represented in white and lower densities in blue-ish colors. Some protostars just formed eject gas in outflows, represented by the pink color.&nbsp; Credit: ALMA (ESO\/NAOJ\/NRAO), K. Morii et al.<\/figcaption><\/figure>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"434\" src=\"https:\/\/sci.nao.ac.jp\/main\/wp-content\/uploads\/2023\/06\/Fig2_Morii-1024x434.png\" alt=\"\" class=\"wp-image-4158\" srcset=\"https:\/\/sci.nao.ac.jp\/main\/wp-content\/uploads\/2023\/06\/Fig2_Morii-1024x434.png 1024w, https:\/\/sci.nao.ac.jp\/main\/wp-content\/uploads\/2023\/06\/Fig2_Morii-300x127.png 300w, https:\/\/sci.nao.ac.jp\/main\/wp-content\/uploads\/2023\/06\/Fig2_Morii-768x326.png 768w, https:\/\/sci.nao.ac.jp\/main\/wp-content\/uploads\/2023\/06\/Fig2_Morii-1536x651.png 1536w, https:\/\/sci.nao.ac.jp\/main\/wp-content\/uploads\/2023\/06\/Fig2_Morii-2048x869.png 2048w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><figcaption class=\"wp-element-caption\">Figure 2:&nbsp;Dust emission maps for 39 IRDCs where massive stars are expected to form in the future. Credit: ALMA (ESO\/NAOJ\/NRAO), K. Morii et al.&nbsp;<\/figcaption><\/figure>\n\n\n\n<p>These results appeared as Kaho Morii et al. \u201cThe ALMA Survey of 70\u03bcm Dark High-mass Clumps in Early Stages (ASHES). IX. Physical Properties and Spatial Distribution of Cores in IRDCs\u201d in The Astrophysical Journal on June 20, 2023.\u00a0<\/p>\n\n\n\n<p>For more information, please see the following links,&nbsp;<\/p>\n\n\n\n<p>NAOJ:&nbsp;<a href=\"https:\/\/www.nao.ac.jp\/en\/news\/science\/2023\/20230620-alma.html\">https:\/\/www.nao.ac.jp\/en\/news\/science\/2023\/20230620-alma.html<\/a><\/p>\n\n\n\n<p>ALMA press release :&nbsp;<a href=\"https:\/\/alma-telescope.jp\/en\/news\/stellarseeds-202306\">https:\/\/alma-telescope.jp\/en\/news\/stellarseeds-202306<\/a><\/p>\n\n\n\n<p>doi:&nbsp;10.3847\/1538-4357\/acccea<\/p>\n","protected":false},"excerpt":{"rendered":"<p>The international team led by Kaho Morii (The University of Tokyo\/NAOJ), Patricio Sanhueza, and Fumitaka Nakam [&hellip;]<\/p>\n","protected":false},"author":45,"featured_media":4157,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"cybocfi_hide_featured_image":"yes","_locale":"en_US","_original_post":"https:\/\/sci.nao.ac.jp\/main\/?p=4156","footnotes":""},"categories":[23],"tags":[],"class_list":["post-4160","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-highlights-en","en-US"],"_links":{"self":[{"href":"https:\/\/sci.nao.ac.jp\/main\/wp-json\/wp\/v2\/posts\/4160","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/sci.nao.ac.jp\/main\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/sci.nao.ac.jp\/main\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/sci.nao.ac.jp\/main\/wp-json\/wp\/v2\/users\/45"}],"replies":[{"embeddable":true,"href":"https:\/\/sci.nao.ac.jp\/main\/wp-json\/wp\/v2\/comments?post=4160"}],"version-history":[{"count":3,"href":"https:\/\/sci.nao.ac.jp\/main\/wp-json\/wp\/v2\/posts\/4160\/revisions"}],"predecessor-version":[{"id":4174,"href":"https:\/\/sci.nao.ac.jp\/main\/wp-json\/wp\/v2\/posts\/4160\/revisions\/4174"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/sci.nao.ac.jp\/main\/wp-json\/wp\/v2\/media\/4157"}],"wp:attachment":[{"href":"https:\/\/sci.nao.ac.jp\/main\/wp-json\/wp\/v2\/media?parent=4160"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/sci.nao.ac.jp\/main\/wp-json\/wp\/v2\/categories?post=4160"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/sci.nao.ac.jp\/main\/wp-json\/wp\/v2\/tags?post=4160"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}