{"id":435,"date":"2024-02-29T14:03:16","date_gmt":"2024-02-29T13:03:16","guid":{"rendered":"https:\/\/www.oa-roma.inaf.it\/caesar\/?p=435"},"modified":"2024-02-29T14:11:07","modified_gmt":"2024-02-29T13:11:07","slug":"identifying-ly%ce%b1-emitter-candidates-with-random-forest-learning-from-galaxies-in-the-candels-survey","status":"publish","type":"post","link":"https:\/\/www.oa-roma.inaf.it\/caesar\/2024\/02\/29\/identifying-ly%ce%b1-emitter-candidates-with-random-forest-learning-from-galaxies-in-the-candels-survey\/","title":{"rendered":"Identifying Ly\u03b1 emitter candidates with Random Forest: Learning from galaxies in the CANDELS survey"},"content":{"rendered":"\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"590\" src=\"https:\/\/www.oa-roma.inaf.it\/caesar\/wp-content\/uploads\/sites\/17\/2024\/02\/WhatsApp-Image-2024-02-29-at-13.54.11-1024x590.jpeg\" alt=\"\" class=\"wp-image-436\" srcset=\"https:\/\/www.oa-roma.inaf.it\/caesar\/wp-content\/uploads\/sites\/17\/2024\/02\/WhatsApp-Image-2024-02-29-at-13.54.11-1024x590.jpeg 1024w, https:\/\/www.oa-roma.inaf.it\/caesar\/wp-content\/uploads\/sites\/17\/2024\/02\/WhatsApp-Image-2024-02-29-at-13.54.11-300x173.jpeg 300w, https:\/\/www.oa-roma.inaf.it\/caesar\/wp-content\/uploads\/sites\/17\/2024\/02\/WhatsApp-Image-2024-02-29-at-13.54.11-768x443.jpeg 768w, https:\/\/www.oa-roma.inaf.it\/caesar\/wp-content\/uploads\/sites\/17\/2024\/02\/WhatsApp-Image-2024-02-29-at-13.54.11.jpeg 1142w\" sizes=\"auto, (max-width: 767px) 89vw, (max-width: 1000px) 54vw, (max-width: 1071px) 543px, 580px\" \/><\/figure>\n\n\n\n<p>The physical processes that make a galaxy a Lyman alpha emitter have been extensively studied over the past 25 yr. However, the correlations between physical and morphological properties of galaxies and the strength of the Ly\u03b1 emission line are still highly debated. Here, we investigate the correlations between the rest-frame Ly\u03b1 equivalent width and stellar mass, star formation rate, dust reddening, metallicity, age, half-light semi-major axis, S\u00e9rsic index, and projected axis ratio in a sample of 1578 galaxies in the redshift range of 2 \u2264 z \u2264 7.9 from the GOODS-S, UDS, and COSMOS fields. From the large sample of Ly\u03b1 emitters (LAEs) in the dataset, we find that LAEs are typically common main sequence (MS) star-forming galaxies that show a stellar mass \u226410<sup>9<\/sup>\u00a0M<sub>\u2299<\/sub>, star formation rate \u2264 10<sup>0.5<\/sup>\u00a0M<sub>\u2299<\/sub>\u00a0yr<sup>\u22121<\/sup>, E(B \u2212 V)\u22640.2, and half-light semi-major axis \u22641 kpc. Building on these findings, we have developed a new method based on a random forest (RF) machine learning (ML) classifier to select galaxies with the highest probability of being Ly\u03b1 emitters. When applied to a population in the redshift range z \u2208 [2.5, 4.5], our classifier holds a (80 \u00b1 2)% accuracy and (73 \u00b1 4)% precision. At higher redshifts (z \u2208 [4.5, 6]), we obtained an accuracy of 73% and precision of 80%. These results highlight the possibility of overcoming the current limitations in assembling large samples of LAEs by making informed predictions that can be used for planning future large-scale spectroscopic surveys.<\/p>\n\n\n\n<p class=\"has-text-align-center\"><a href=\"https:\/\/www.aanda.org\/articles\/aa\/full_html\/2023\/09\/aa47026-23\/aa47026-23.html\" target=\"_blank\" rel=\"noreferrer noopener\"><strong>FULL ARTICLE<\/strong><\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>The physical processes that make a galaxy a Lyman alpha emitter have been extensively studied over the past 25 yr. However, the correlations between physical and morphological properties of galaxies and the strength of the Ly\u03b1 emission line are still highly debated. Here, we investigate the correlations between the rest-frame Ly\u03b1 equivalent width and stellar &hellip; <\/p>\n<p class=\"link-more\"><a href=\"https:\/\/www.oa-roma.inaf.it\/caesar\/2024\/02\/29\/identifying-ly%ce%b1-emitter-candidates-with-random-forest-learning-from-galaxies-in-the-candels-survey\/\" class=\"more-link\">Continue reading<span class=\"screen-reader-text\"> &#8220;Identifying Ly\u03b1 emitter candidates with Random Forest: Learning from galaxies in the CANDELS survey&#8221;<\/span><\/a><\/p>\n","protected":false},"author":1459,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[1,13],"tags":[],"class_list":["post-435","post","type-post","status-publish","format-standard","hentry","category-galaxies","category-observations"],"acf":[],"jetpack_featured_media_url":"","_links":{"self":[{"href":"https:\/\/www.oa-roma.inaf.it\/caesar\/wp-json\/wp\/v2\/posts\/435","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.oa-roma.inaf.it\/caesar\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.oa-roma.inaf.it\/caesar\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.oa-roma.inaf.it\/caesar\/wp-json\/wp\/v2\/users\/1459"}],"replies":[{"embeddable":true,"href":"https:\/\/www.oa-roma.inaf.it\/caesar\/wp-json\/wp\/v2\/comments?post=435"}],"version-history":[{"count":1,"href":"https:\/\/www.oa-roma.inaf.it\/caesar\/wp-json\/wp\/v2\/posts\/435\/revisions"}],"predecessor-version":[{"id":437,"href":"https:\/\/www.oa-roma.inaf.it\/caesar\/wp-json\/wp\/v2\/posts\/435\/revisions\/437"}],"wp:attachment":[{"href":"https:\/\/www.oa-roma.inaf.it\/caesar\/wp-json\/wp\/v2\/media?parent=435"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.oa-roma.inaf.it\/caesar\/wp-json\/wp\/v2\/categories?post=435"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.oa-roma.inaf.it\/caesar\/wp-json\/wp\/v2\/tags?post=435"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}