{"id":957,"date":"2019-09-02T05:17:57","date_gmt":"2019-09-01T19:17:57","guid":{"rendered":"http:\/\/astro3d.org.au\/?p=957"},"modified":"2021-02-03T17:08:51","modified_gmt":"2021-02-03T06:08:51","slug":"and-then-there-was-light-looking-for-the-first-stars-in-the-universe","status":"publish","type":"post","link":"https:\/\/astro3d.org.au\/and-then-there-was-light-looking-for-the-first-stars-in-the-universe\/","title":{"rendered":"Shining a light on the Cosmic Dark Ages"},"content":{"rendered":"<div class=\"fusion-fullwidth fullwidth-box fusion-builder-row-1 nonhundred-percent-fullwidth non-hundred-percent-height-scrolling\" style=\"--awb-border-radius-top-left:0px;--awb-border-radius-top-right:0px;--awb-border-radius-bottom-right:0px;--awb-border-radius-bottom-left:0px;--awb-flex-wrap:wrap;\" ><div class=\"fusion-builder-row fusion-row\"><div class=\"fusion-layout-column fusion_builder_column fusion-builder-column-0 fusion_builder_column_1_1 1_1 fusion-one-full fusion-column-first fusion-column-last\" style=\"--awb-bg-size:cover;--awb-margin-bottom:0px;\"><div class=\"fusion-column-wrapper fusion-flex-column-wrapper-legacy\"><div class=\"fusion-text fusion-text-1\"><p><!-- divi:heading {\"level\":3} --><\/p>\n<h3 data-fontsize=\"24\" data-lineheight=\"31.2px\" class=\"fusion-responsive-typography-calculated\" style=\"--fontSize:24; line-height: 1.3;\">Researchers hunt for a 12-billion-year-old signal that marks the end of the post Big Bang \u201cdark age\u201d.<\/h3>\n<p><!-- \/divi:heading --><\/p>\n<p><!-- divi:paragraph -->Astronomers are closing in on a signal that has been travelling across the Universe for 12 billion years, bringing them nearer to understanding the life and death of the very earliest stars.<\/p>\n<p><!-- \/divi:paragraph --><\/p>\n<p><!-- divi:html --><\/p>\n<figure><iframe src=\"https:\/\/www.youtube.com\/embed\/yYNkbq8CaJk?enablejsapi=1&amp;wmode=opaque\" width=\"560\" height=\"315\" allowfullscreen=\"allowfullscreen\" id=\"player_1\"><\/iframe><\/figure>\n<p><!-- \/divi:html --><\/p>\n<p><!-- divi:paragraph -->In a paper on the preprint site<em> arXiv<\/em>and soon to be published in the Astrophysical Journal, a team led by Dr Nichole Barry from Australia\u2019s University of Melbourne and the ARC Centre of Excellence for All Sky Astrophysics in 3 Dimensions (ASTRO 3D) reports a 10-fold improvement on data gathered by the Murchison Widefield Array (MWA) \u2013 a collection of 4096 dipole antennas set in the remote hinterland of Western Australia.<\/p>\n<p><!-- \/divi:paragraph --><\/p>\n<p><!-- divi:image {\"id\":2525,\"align\":\"center\",\"className\":\"wp-image-2525\"} --><\/p>\n<div class=\"wp-block-image wp-image-2525\">\n<figure class=\"aligncenter\"><img decoding=\"async\" src=\"http:\/\/astro3d.org.au\/wp-content\/uploads\/Dr-Nichole-Barry-at-MWA-credit-RUBY-BYRNE-1024x683-1024x683.jpg\" alt=\"\" class=\"wp-image-2525\"><\/p><figcaption>Dr Nichole Barry at The Murchison Widefield Array (MWA). Credit: Ruby Byrne<\/figcaption><\/figure>\n<\/div>\n<p><!-- \/divi:image --><\/p>\n<p><!-- divi:paragraph -->The MWA, which started operating in 2013, was built specifically to detect electromagnetic radiation emitted by neutral hydrogen \u2013 a gas that comprised most of the infant Universe in the period when the soup of disconnected protons and neutrons spawned by the Big Bang started to cool down.<\/p>\n<p><!-- \/divi:paragraph --><\/p>\n<p><!-- divi:paragraph -->Eventually, these hydrogen atoms began to clump together to form stars \u2013 the very first ones to exist \u2013 initiating a major phase in the evolution of the Universe, known as the Epoch of Reionisation, or EoR.<\/p>\n<p><!-- \/divi:paragraph --><\/p>\n<p><!-- divi:paragraph -->\u201cDefining the evolution of the EoR is extremely important for our understanding of astrophysics and cosmology,\u201d explains Dr Barry.<\/p>\n<p><!-- \/divi:paragraph --><\/p>\n<p><!-- divi:paragraph -->\u201cSo far, though, no one has been able to observe it. These results take us a lot closer to that goal.\u201d<\/p>\n<p><!-- \/divi:paragraph --><\/p>\n<p><!-- divi:image {\"id\":462,\"align\":\"center\",\"className\":\"wp-image-462\"} --><\/p>\n<div class=\"wp-block-image wp-image-462\">\n<figure class=\"aligncenter\"><img decoding=\"async\" src=\"http:\/\/astro3d.org.au\/wp-content\/uploads\/genesis.jpg\" alt=\"\" class=\"wp-image-462\"><\/p><figcaption>In this image of the Epoch of Reionisation, neutral hydrogen, in red, is gradually ionizsed by the first stars, shown in white. The image was made by the University of Melbourne\u2019s Dark-ages Reionisation And Galaxy Observables from Numerical Simulations (DRAGONS) programme. Credit: Paul Geil and Simon Mutch<\/figcaption><\/figure>\n<\/div>\n<p><!-- \/divi:image --><\/p>\n<p><!-- divi:paragraph -->The neutral hydrogen that dominated space and time before and in the early period of the EoR radiated at a wavelength of approximately 21 centimetres. Stretched now to somewhere above two metres because of the expansion of the Universe, the signal persists \u2013 and detecting it remains the theoretical best way to probe conditions in the early days of the Cosmos.<\/p>\n<p><!-- \/divi:paragraph --><\/p>\n<p><!-- divi:paragraph -->However, doing so is fiendishly difficult.<\/p>\n<p><!-- \/divi:paragraph --><\/p>\n<p><!-- divi:paragraph -->\u201cThe signal that we\u2019re looking for is more than 12 billion years old,\u201d explains ASTRO-3D member and co-author Associate Professor Cathryn Trott, from the International Centre for Radio Astronomy Research at Curtin University in Western Australia.<\/p>\n<p><!-- \/divi:paragraph --><\/p>\n<p><!-- divi:paragraph -->\u201cIt is exceptionally weak and there are a lot of other galaxies in between it and us. They get in the way and make it very difficult to extract the information we\u2019re after.\u201d<\/p>\n<p><!-- \/divi:paragraph --><\/p>\n<p><!-- divi:paragraph -->In other words, the signals recorded by the MWA \u2013 and other EoR-hunting devices such as the Hydrogen Epoch of Reionisation Array in South Africa and the Low Frequency Array in The Netherlands \u2013 are extremely messy.<\/p>\n<p><!-- \/divi:paragraph --><\/p>\n<p><!-- divi:paragraph -->Using 21 hours of raw data Dr Barry, co-lead author Mike Wilensky, from the University of Washington in the US, and colleagues explored new techniques to refine analysis and exclude consistent sources of signal contamination, including ultra-faint interference generated by radio broadcasts on Earth.<\/p>\n<p><!-- \/divi:paragraph --><\/p>\n<p><!-- divi:paragraph -->The result was a level of precision that significantly reduced the range in which the EoR may have begun, pulling in constraints by almost an order of magnitude.<\/p>\n<p><!-- \/divi:paragraph --><\/p>\n<p><!-- divi:paragraph -->\u201cWe can\u2019t really say that this paper gets us closer to precisely dating the start or finish of the EoR, but it does rule out some of the more extreme models,\u201d says Professor Trott.<\/p>\n<p><!-- \/divi:paragraph --><\/p>\n<p><!-- divi:paragraph -->\u201cThat it happened very rapidly is now ruled out. That the conditions were very cold is now also ruled out.\u201d<\/p>\n<p><!-- \/divi:paragraph --><\/p>\n<p><!-- divi:paragraph -->Dr Barry said the results represented not only a step forward in the global quest to explore the infant Universe, but also established a framework for further research.<\/p>\n<p><!-- \/divi:paragraph --><\/p>\n<p><!-- divi:paragraph -->\u201cWe have about 3000 hours of data from MWA,\u201d she explains, \u201cand for our purposes some of it is more useful than others. This approach will let us identify which bits are most promising, and analyse it better than we ever could before.\u201d<\/p>\n<p><!-- \/divi:paragraph --><\/p>\n<p><!-- divi:paragraph -->The research was conducted by multiple ASTRO-3D researchers based at the University of Melbourne, Curtin University, the CSIRO\u2019s Astronomy and Space Science division in Epping, NSW, and the University of Washington.<\/p>\n<p><!-- \/divi:paragraph --><\/p>\n<p><!-- divi:paragraph -->They worked in collaboration with scientists from Arizona State University, Brown University and MIT in the USA, Kumamoto University in Japan and Raman Research Institute in India.<\/p>\n<p><!-- \/divi:paragraph --><\/p>\n<p><!-- divi:paragraph -->The paper is available here: <a href=\"https:\/\/arxiv.org\/abs\/1909.00561\">https:\/\/arxiv.org\/abs\/1909.00561<\/a><\/p>\n<p><!-- \/divi:paragraph --><\/p>\n<p><!-- divi:paragraph --><strong>Contacts:<\/strong><\/p>\n<p><!-- \/divi:paragraph --><\/p>\n<p><!-- divi:paragraph --><strong>Andrew Masterson (Media Contact, Science in Public)<\/strong><\/p>\n<p><!-- \/divi:paragraph --><\/p>\n<p><!-- divi:paragraph -->Ph: +61 488 777 179                 E: andrew@scienceinpublic.com.au<\/p>\n<p><!-- \/divi:paragraph --><\/p>\n<p><!-- divi:paragraph --><strong>Ingrid McCarthy (Media Contact, ASTRO 3D)<\/strong><\/p>\n<p><!-- \/divi:paragraph --><\/p>\n<p><!-- divi:paragraph -->Ph: +61 261 258 022                 E:ingrid.mccarthy@anu.edu.au<\/p>\n<p><!-- \/divi:paragraph --><\/p>\n<p><!-- divi:paragraph --><strong>More Information:<\/strong><\/p>\n<p><!-- \/divi:paragraph --><\/p>\n<p><!-- divi:paragraph --><strong>More about ASTRO-3D<\/strong><\/p>\n<p><!-- \/divi:paragraph --><\/p>\n<p><!-- divi:paragraph -->ASTRO 3D is a seven-year $40 million Centre of Excellence project funded by the Australian Government through the Australian Research Council. The Centre began in June 2017 and will end in June 2024. It hosts around 200 investigators and professional staff, mostly based at six nodes: the Australian National University, Curtin University, Swinburne University of Technology, University of Melbourne, University of Sydney, and University of Western Australia. <a href=\"http:\/\/astro3d.org.au\/\">http:\/\/astro3d.org.au\/<\/a><\/p>\n<p><!-- \/divi:paragraph --><\/p>\n<p><!-- divi:paragraph --><strong>More about the MWA<\/strong><\/p>\n<p><!-- \/divi:paragraph --><\/p>\n<p><!-- divi:paragraph -->The Murchison Widefield Array (MWA) is a low-frequency radio telescope, located at the CSIRO Murchison Radio-astronomy Observatory (MRO) in Western Australia. The telescope is operated by Curtin University on behalf of an international collaboration of 21 research organisations spanning  Australia, New Zealand, Japan, China, Canada and the United States. More details are available at <a href=\"http:\/\/www.mwatelescope.org\/\">www.mwatelescope.org<\/a>.   Images available here: <a href=\"http:\/\/www.mwatelescope.org\/multimedia\/images\">http:\/\/www.mwatelescope.org\/multimedia\/images<\/a><\/p>\n<p><!-- \/divi:paragraph --><\/p>\n<p>[\/et_pb_text][\/et_pb_column][\/et_pb_row][\/et_pb_section]\n<!-- \/wp:divi\/placeholder --><\/p>\n<\/div><div class=\"fusion-clearfix\"><\/div><\/div><\/div><\/div><\/div>\n","protected":false},"excerpt":{"rendered":"","protected":false},"author":272,"featured_media":188,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[20,24,2,7],"tags":[],"coauthors":[],"class_list":["post-957","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-genesis","category-mwa-eor","category-news","category-science"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v23.8 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Shining a light on the Cosmic Dark Ages - 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