{"id":28825,"date":"2019-03-01T12:00:51","date_gmt":"2019-03-01T01:00:51","guid":{"rendered":"http:\/\/astro3d.org.au\/?p=28825"},"modified":"2021-05-06T13:36:27","modified_gmt":"2021-05-06T03:36:27","slug":"foreground-effects-in-the-search-for-the-epoch-of-reionisation","status":"publish","type":"post","link":"https:\/\/astro3d.org.au\/foreground-effects-in-the-search-for-the-epoch-of-reionisation\/","title":{"rendered":"Foreground effects in the search for the Epoch of Reionisation"},"content":{"rendered":"

March 2019\u2019s \u201cMonthly Media\u201d is from project lead Associate Professor\u00a0Cathryn Trott<\/a><\/span>, and showcases how the search for the\u00a0Epoch of Reionisation<\/a><\/span>\u00a0(EoR) is affected by the presence of the Milky Way and other galaxies within an observation.<\/p>\n

The EoR project is hunting for a weak signal from the early Universe. To detect this signal, parts of the sky that are free from emission from our own galaxy and other nearby galaxies are observed. The effect the Milky Way and other galaxies has on the power spectrum observations can be seen in the below GIF. The power spectrum is the generated diagram on the left of the video, showing the amount of signal power on different size scales on the sky.<\/p>\n<\/div>

<\/span><\/div><\/div><\/div>

Left: The power spectrum image, which breaks the radio observation into its component scale-structures. Right: The visible sky above the telescope for each observation, overlayed with the telescope\u2019s beam pattern.<\/i><\/span><\/p>\n<\/div>

When the observation passes over bright parts of the sky (e.g., the Galactic Anti-Center at RA = 8 hours \u2013 just before the GIF loops), we can see the signal power increase. In the below images, the first shows when the Galactic Anti-Center is far from the primary beam, and the second shows when it is within the primary beam.<\/p>\n<\/div>

<\/span><\/div><\/div>

Can see the effect of the changed position of the Galactic Anti-Center in the images (right) on the power spectrum (left). The increase of power in the lower power spectrum plot destroys the ability of being able to detect the EoR.<\/i><\/span><\/p>\n<\/div>

These increases in power destroy an EoR observation, as they obscure the same scale-frequencies the EoR signal is expected to occupy. This information helps to define the observing fields for the EoR experiment and bring its detection closer.<\/p>\n<\/div>

<\/div><\/div><\/div><\/div><\/div>\n","protected":false},"excerpt":{"rendered":"","protected":false},"author":223,"featured_media":28822,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[14,23,24,4,7],"tags":[25,26,27,28,30,33,34,35],"coauthors":[],"class_list":["post-28825","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-curtin","category-monthly-media","category-mwa-eor","category-outreach","category-science","tag-curtin","tag-curtin-university","tag-early-universe","tag-eor","tag-epoch-of-reionisation","tag-monthly-media","tag-murchison-widefield-array","tag-mwa"],"acf":[],"yoast_head":"\nForeground effects in the search for the Epoch of Reionisation - ASTRO 3D<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/astro3d.org.au\/foreground-effects-in-the-search-for-the-epoch-of-reionisation\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Foreground effects in the search for the Epoch of Reionisation - ASTRO 3D\" \/>\n<meta property=\"og:url\" content=\"https:\/\/astro3d.org.au\/foreground-effects-in-the-search-for-the-epoch-of-reionisation\/\" \/>\n<meta property=\"og:site_name\" content=\"ASTRO 3D\" \/>\n<meta property=\"article:published_time\" content=\"2019-03-01T01:00:51+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2021-05-06T03:36:27+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/astro3d.org.au\/wp-content\/uploads\/2019\/03\/1132606000_banner.png\" \/>\n\t<meta property=\"og:image:width\" content=\"1200\" \/>\n\t<meta property=\"og:image:height\" content=\"502\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/png\" \/>\n<meta name=\"author\" content=\"Teresa Slaven-Blair\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"Teresa Slaven-Blair\" \/>\n\t<meta name=\"twitter:label2\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data2\" content=\"5 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"WebPage\",\"@id\":\"https:\/\/astro3d.org.au\/foreground-effects-in-the-search-for-the-epoch-of-reionisation\/\",\"url\":\"https:\/\/astro3d.org.au\/foreground-effects-in-the-search-for-the-epoch-of-reionisation\/\",\"name\":\"Foreground effects in the search for the Epoch of Reionisation - ASTRO 3D\",\"isPartOf\":{\"@id\":\"https:\/\/astro3d.org.au\/#website\"},\"primaryImageOfPage\":{\"@id\":\"https:\/\/astro3d.org.au\/foreground-effects-in-the-search-for-the-epoch-of-reionisation\/#primaryimage\"},\"image\":{\"@id\":\"https:\/\/astro3d.org.au\/foreground-effects-in-the-search-for-the-epoch-of-reionisation\/#primaryimage\"},\"thumbnailUrl\":\"https:\/\/astro3d.org.au\/wp-content\/uploads\/2019\/03\/1132606000_banner.png\",\"datePublished\":\"2019-03-01T01:00:51+00:00\",\"dateModified\":\"2021-05-06T03:36:27+00:00\",\"author\":{\"@id\":\"https:\/\/astro3d.org.au\/#\/schema\/person\/82c2cc26394877a4bd5ade4414788161\"},\"breadcrumb\":{\"@id\":\"https:\/\/astro3d.org.au\/foreground-effects-in-the-search-for-the-epoch-of-reionisation\/#breadcrumb\"},\"inLanguage\":\"en-US\",\"potentialAction\":[{\"@type\":\"ReadAction\",\"target\":[\"https:\/\/astro3d.org.au\/foreground-effects-in-the-search-for-the-epoch-of-reionisation\/\"]}]},{\"@type\":\"ImageObject\",\"inLanguage\":\"en-US\",\"@id\":\"https:\/\/astro3d.org.au\/foreground-effects-in-the-search-for-the-epoch-of-reionisation\/#primaryimage\",\"url\":\"https:\/\/astro3d.org.au\/wp-content\/uploads\/2019\/03\/1132606000_banner.png\",\"contentUrl\":\"https:\/\/astro3d.org.au\/wp-content\/uploads\/2019\/03\/1132606000_banner.png\",\"width\":1200,\"height\":502},{\"@type\":\"BreadcrumbList\",\"@id\":\"https:\/\/astro3d.org.au\/foreground-effects-in-the-search-for-the-epoch-of-reionisation\/#breadcrumb\",\"itemListElement\":[{\"@type\":\"ListItem\",\"position\":1,\"name\":\"Home\",\"item\":\"https:\/\/astro3d.org.au\/\"},{\"@type\":\"ListItem\",\"position\":2,\"name\":\"Foreground effects in the search for the Epoch of Reionisation\"}]},{\"@type\":\"WebSite\",\"@id\":\"https:\/\/astro3d.org.au\/#website\",\"url\":\"https:\/\/astro3d.org.au\/\",\"name\":\"ASTRO 3D\",\"description\":\"Unlocking the Universe - Inspiring the Future\",\"potentialAction\":[{\"@type\":\"SearchAction\",\"target\":{\"@type\":\"EntryPoint\",\"urlTemplate\":\"https:\/\/astro3d.org.au\/?s={search_term_string}\"},\"query-input\":{\"@type\":\"PropertyValueSpecification\",\"valueRequired\":true,\"valueName\":\"search_term_string\"}}],\"inLanguage\":\"en-US\"},{\"@type\":\"Person\",\"@id\":\"https:\/\/astro3d.org.au\/#\/schema\/person\/82c2cc26394877a4bd5ade4414788161\",\"name\":\"Teresa Slaven-Blair\",\"image\":{\"@type\":\"ImageObject\",\"inLanguage\":\"en-US\",\"@id\":\"https:\/\/astro3d.org.au\/#\/schema\/person\/image\/8ba8be804b0a7caf9a2c35566888c51d\",\"url\":\"https:\/\/astro3d.org.au\/wp-content\/uploads\/2020\/08\/Teresa-Slaven-Blair-2_Perth-Science-Festival_credit-Deprimo-Photography-2-150x150.jpg\",\"contentUrl\":\"https:\/\/astro3d.org.au\/wp-content\/uploads\/2020\/08\/Teresa-Slaven-Blair-2_Perth-Science-Festival_credit-Deprimo-Photography-2-150x150.jpg\",\"caption\":\"Teresa Slaven-Blair\"},\"description\":\"Teresa was the Outreach Coordinator for ASTRO 3D's Curtin University node, where she created opportunities for the Curtin astronomers to talk about their research beyond academia, and invented activities and resources to help them do that. Teresa is most proud of, and most known within ASTRO 3D for, her \\\"Epoch of Bubbles\\\" activity, which uses simple soap bubbles and food dye as an analogy for the environment around the first stars and galaxies that formed in the Universe, during the Epoch of Reionisation. Teresa has a honours degree in astrophysics from Curtin University, and is currently pursuing a PhD in gravitational wave and radio wave astrophysics at the University of Western Australia, with the other astronomy ARC centre of excellence, OzGrav. Teresa loves everything space, and thoroughly loves talking about it to anyone who will listen. Luckily, most people have a passion for space, so willing listeners are easy to find. She has over a decade's worth of science communication experience, all borne on the back of her enthusiasm for talking about space.\",\"sameAs\":[\"https:\/\/www.linkedin.com\/in\/teresa-slaven-blair\/\"],\"url\":\"https:\/\/astro3d.org.au\/member\/teresaslavenblair\/\"}]}<\/script>\n<!-- \/ Yoast SEO plugin. -->","yoast_head_json":{"title":"Foreground effects in the search for the Epoch of Reionisation - ASTRO 3D","robots":{"index":"index","follow":"follow","max-snippet":"max-snippet:-1","max-image-preview":"max-image-preview:large","max-video-preview":"max-video-preview:-1"},"canonical":"https:\/\/astro3d.org.au\/foreground-effects-in-the-search-for-the-epoch-of-reionisation\/","og_locale":"en_US","og_type":"article","og_title":"Foreground effects in the search for the Epoch of Reionisation - ASTRO 3D","og_url":"https:\/\/astro3d.org.au\/foreground-effects-in-the-search-for-the-epoch-of-reionisation\/","og_site_name":"ASTRO 3D","article_published_time":"2019-03-01T01:00:51+00:00","article_modified_time":"2021-05-06T03:36:27+00:00","og_image":[{"width":1200,"height":502,"url":"https:\/\/astro3d.org.au\/wp-content\/uploads\/2019\/03\/1132606000_banner.png","type":"image\/png"}],"author":"Teresa Slaven-Blair","twitter_card":"summary_large_image","twitter_misc":{"Written by":"Teresa Slaven-Blair","Est. reading time":"5 minutes"},"schema":{"@context":"https:\/\/schema.org","@graph":[{"@type":"WebPage","@id":"https:\/\/astro3d.org.au\/foreground-effects-in-the-search-for-the-epoch-of-reionisation\/","url":"https:\/\/astro3d.org.au\/foreground-effects-in-the-search-for-the-epoch-of-reionisation\/","name":"Foreground effects in the search for the Epoch of Reionisation - ASTRO 3D","isPartOf":{"@id":"https:\/\/astro3d.org.au\/#website"},"primaryImageOfPage":{"@id":"https:\/\/astro3d.org.au\/foreground-effects-in-the-search-for-the-epoch-of-reionisation\/#primaryimage"},"image":{"@id":"https:\/\/astro3d.org.au\/foreground-effects-in-the-search-for-the-epoch-of-reionisation\/#primaryimage"},"thumbnailUrl":"https:\/\/astro3d.org.au\/wp-content\/uploads\/2019\/03\/1132606000_banner.png","datePublished":"2019-03-01T01:00:51+00:00","dateModified":"2021-05-06T03:36:27+00:00","author":{"@id":"https:\/\/astro3d.org.au\/#\/schema\/person\/82c2cc26394877a4bd5ade4414788161"},"breadcrumb":{"@id":"https:\/\/astro3d.org.au\/foreground-effects-in-the-search-for-the-epoch-of-reionisation\/#breadcrumb"},"inLanguage":"en-US","potentialAction":[{"@type":"ReadAction","target":["https:\/\/astro3d.org.au\/foreground-effects-in-the-search-for-the-epoch-of-reionisation\/"]}]},{"@type":"ImageObject","inLanguage":"en-US","@id":"https:\/\/astro3d.org.au\/foreground-effects-in-the-search-for-the-epoch-of-reionisation\/#primaryimage","url":"https:\/\/astro3d.org.au\/wp-content\/uploads\/2019\/03\/1132606000_banner.png","contentUrl":"https:\/\/astro3d.org.au\/wp-content\/uploads\/2019\/03\/1132606000_banner.png","width":1200,"height":502},{"@type":"BreadcrumbList","@id":"https:\/\/astro3d.org.au\/foreground-effects-in-the-search-for-the-epoch-of-reionisation\/#breadcrumb","itemListElement":[{"@type":"ListItem","position":1,"name":"Home","item":"https:\/\/astro3d.org.au\/"},{"@type":"ListItem","position":2,"name":"Foreground effects in the search for the Epoch of Reionisation"}]},{"@type":"WebSite","@id":"https:\/\/astro3d.org.au\/#website","url":"https:\/\/astro3d.org.au\/","name":"ASTRO 3D","description":"Unlocking the Universe - Inspiring the Future","potentialAction":[{"@type":"SearchAction","target":{"@type":"EntryPoint","urlTemplate":"https:\/\/astro3d.org.au\/?s={search_term_string}"},"query-input":{"@type":"PropertyValueSpecification","valueRequired":true,"valueName":"search_term_string"}}],"inLanguage":"en-US"},{"@type":"Person","@id":"https:\/\/astro3d.org.au\/#\/schema\/person\/82c2cc26394877a4bd5ade4414788161","name":"Teresa Slaven-Blair","image":{"@type":"ImageObject","inLanguage":"en-US","@id":"https:\/\/astro3d.org.au\/#\/schema\/person\/image\/8ba8be804b0a7caf9a2c35566888c51d","url":"https:\/\/astro3d.org.au\/wp-content\/uploads\/2020\/08\/Teresa-Slaven-Blair-2_Perth-Science-Festival_credit-Deprimo-Photography-2-150x150.jpg","contentUrl":"https:\/\/astro3d.org.au\/wp-content\/uploads\/2020\/08\/Teresa-Slaven-Blair-2_Perth-Science-Festival_credit-Deprimo-Photography-2-150x150.jpg","caption":"Teresa Slaven-Blair"},"description":"Teresa was the Outreach Coordinator for ASTRO 3D's Curtin University node, where she created opportunities for the Curtin astronomers to talk about their research beyond academia, and invented activities and resources to help them do that. Teresa is most proud of, and most known within ASTRO 3D for, her \"Epoch of Bubbles\" activity, which uses simple soap bubbles and food dye as an analogy for the environment around the first stars and galaxies that formed in the Universe, during the Epoch of Reionisation. Teresa has a honours degree in astrophysics from Curtin University, and is currently pursuing a PhD in gravitational wave and radio wave astrophysics at the University of Western Australia, with the other astronomy ARC centre of excellence, OzGrav. Teresa loves everything space, and thoroughly loves talking about it to anyone who will listen. Luckily, most people have a passion for space, so willing listeners are easy to find. She has over a decade's worth of science communication experience, all borne on the back of her enthusiasm for talking about space.","sameAs":["https:\/\/www.linkedin.com\/in\/teresa-slaven-blair\/"],"url":"https:\/\/astro3d.org.au\/member\/teresaslavenblair\/"}]}},"_links":{"self":[{"href":"https:\/\/astro3d.org.au\/wp-json\/wp\/v2\/posts\/28825","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/astro3d.org.au\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/astro3d.org.au\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/astro3d.org.au\/wp-json\/wp\/v2\/users\/223"}],"replies":[{"embeddable":true,"href":"https:\/\/astro3d.org.au\/wp-json\/wp\/v2\/comments?post=28825"}],"version-history":[{"count":3,"href":"https:\/\/astro3d.org.au\/wp-json\/wp\/v2\/posts\/28825\/revisions"}],"predecessor-version":[{"id":30109,"href":"https:\/\/astro3d.org.au\/wp-json\/wp\/v2\/posts\/28825\/revisions\/30109"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/astro3d.org.au\/wp-json\/wp\/v2\/media\/28822"}],"wp:attachment":[{"href":"https:\/\/astro3d.org.au\/wp-json\/wp\/v2\/media?parent=28825"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/astro3d.org.au\/wp-json\/wp\/v2\/categories?post=28825"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/astro3d.org.au\/wp-json\/wp\/v2\/tags?post=28825"},{"taxonomy":"author","embeddable":true,"href":"https:\/\/astro3d.org.au\/wp-json\/wp\/v2\/coauthors?post=28825"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}