{"id":28820,"date":"2019-02-01T12:00:51","date_gmt":"2019-02-01T01:00:51","guid":{"rendered":"http:\/\/astro3d.org.au\/?p=28820"},"modified":"2021-05-06T13:37:26","modified_gmt":"2021-05-06T03:37:26","slug":"how-a-square-kilometer-array-prototype-will-see-the-sky","status":"publish","type":"post","link":"https:\/\/astro3d.org.au\/how-a-square-kilometer-array-prototype-will-see-the-sky\/","title":{"rendered":"How a Square Kilometer Array prototype will see the sky"},"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;\"><div class=\"fusion-column-wrapper fusion-column-has-shadow fusion-flex-column-wrapper-legacy\"><div class=\"fusion-text fusion-text-1\"><p class=\"has-text-color has-very-dark-gray-color\">February 2019\u2019s \u201cMonthly Media\u201d is from PhD student Mike Kriele and is a simulation of how the\u00a0<span style=\"text-decoration: underline\"><a href=\"https:\/\/www.skatelescope.org\/\">Square Kilometer Array<\/a><\/span>\u2018s (SKA) prototype the\u00a0<span style=\"text-decoration: underline\"><a href=\"http:\/\/www.mwatelescope.org\/telescope\/external\/aavs\">Aperture Array Verification System<\/a><\/span>\u00a01 (AAVS1) is expected to observe the Milky Way as it passes overhead.<\/p>\n<\/div><div class=\"fusion-image-element fusion-image-align-center in-legacy-container\" style=\"text-align:center;--awb-liftup-border-radius:0px;--awb-caption-title-font-family:var(--h2_typography-font-family);--awb-caption-title-font-weight:var(--h2_typography-font-weight);--awb-caption-title-font-style:var(--h2_typography-font-style);--awb-caption-title-size:var(--h2_typography-font-size);--awb-caption-title-transform:var(--h2_typography-text-transform);--awb-caption-title-line-height:var(--h2_typography-line-height);--awb-caption-title-letter-spacing:var(--h2_typography-letter-spacing);\"><div class=\"imageframe-align-center\"><div class=\"awb-image-frame awb-image-frame-1 imageframe-liftup\"><span class=\" fusion-imageframe imageframe-none imageframe-1\"><img decoding=\"async\" width=\"600\" height=\"338\" title=\"Timeline 1-GIF\" src=\"http:\/\/astro3d.org.au\/wp-content\/uploads\/2019\/02\/Timeline-1-GIF.gif\" alt class=\"img-responsive wp-image-28830\"\/><\/span><\/div><\/div><\/div><div class=\"fusion-text fusion-text-2\"><p><span style=\"font-size: 14px\" data-fusion-font=\"true\"><i>Two antenna polarisations of how AAVS1 is expected to observe the sky. Depending on the polarisation of the antenna, there will be higher intensity in different parts of the image. Left: XPOL-beam polarisation. If you look closely you can see there is more detail towards the top and bottom of the observation. Right: YPOL-beam polarisation. Similarly, there is more detail at the sides of the observation.<\/i><\/span><\/p>\n<\/div><div class=\"fusion-text fusion-text-3\"><p class=\"has-text-color has-very-dark-gray-color\">The 1440 images that compose the GIF are a combination of decades old well-established observations of the Milky Way (the revered\u00a0<span style=\"text-decoration: underline\"><a href=\"http:\/\/articles.adsabs.harvard.edu\/cgi-bin\/nph-iarticle_query?1982A%26AS...47....1H&amp;data_type=PDF_HIGH&amp;whole_paper=YES&amp;type=PRINTER&amp;filetype=.pdf\">Haslam Map<\/a><\/span>) simulated through the field of view of how the AAVS1 sees the sky.<\/p>\n<p class=\"has-text-color has-very-dark-gray-color\">Mike has taken the Haslam map and remapped it to show only what will be visible above the Murchison Radio Observatory where the SKA core and AAVS1 are located, removing the section of the sky blocked by the Earth from the Southern Hemisphere.<\/p>\n<\/div><div class=\"fusion-image-element fusion-image-align-center in-legacy-container\" style=\"text-align:center;--awb-caption-title-font-family:var(--h2_typography-font-family);--awb-caption-title-font-weight:var(--h2_typography-font-weight);--awb-caption-title-font-style:var(--h2_typography-font-style);--awb-caption-title-size:var(--h2_typography-font-size);--awb-caption-title-transform:var(--h2_typography-text-transform);--awb-caption-title-line-height:var(--h2_typography-line-height);--awb-caption-title-letter-spacing:var(--h2_typography-letter-spacing);\"><div class=\"imageframe-align-center\"><span class=\" fusion-imageframe imageframe-none imageframe-2 hover-type-zoomin\"><img decoding=\"async\" width=\"810\" height=\"405\" title=\"HAS14\" src=\"http:\/\/astro3d.org.au\/wp-content\/uploads\/2019\/02\/HAS14.png\" alt class=\"img-responsive wp-image-28831\" srcset=\"https:\/\/astro3d.org.au\/wp-content\/uploads\/2019\/02\/HAS14-200x100.png 200w, https:\/\/astro3d.org.au\/wp-content\/uploads\/2019\/02\/HAS14-400x200.png 400w, https:\/\/astro3d.org.au\/wp-content\/uploads\/2019\/02\/HAS14-600x300.png 600w, https:\/\/astro3d.org.au\/wp-content\/uploads\/2019\/02\/HAS14-800x400.png 800w, https:\/\/astro3d.org.au\/wp-content\/uploads\/2019\/02\/HAS14.png 810w\" sizes=\"(max-width: 800px) 100vw, 810px\" \/><\/span><\/div><\/div><div class=\"fusion-text fusion-text-4\"><p><span style=\"font-size: 14px\" data-fusion-font=\"true\"><i>The Haslam Map. This all-sky image was published in 1982, and was generated by taking many small images of the sky and stitching them together (mosaicing), using a combination of single-dish and interferometric telescopes to image different sized features.<\/i><\/span><\/p>\n<\/div><div class=\"fusion-text fusion-text-5\"><p class=\"has-text-color has-very-dark-gray-color\">Each telescope has a unique \u2018window\u2019 through which it views the Universe, known as the beam pattern. Mike has taken the expected beam pattern of the AAVS1 antenna and mapped two polarisations of the telescope as the Milky Way Galaxy passes overhead.<\/p>\n<p class=\"has-text-color has-very-dark-gray-color\">As the observation progresses, the two polarisations of the beams affect the observed intensity in different parts of the images, and you can see features appear and disappear as the telescope\u2019s angle on the sky changes.<\/p>\n<p class=\"has-text-color has-very-dark-gray-color\">Mike will use these simulations to test a\u00a0<span style=\"text-decoration: underline\"><a href=\"https:\/\/arxiv.org\/pdf\/1711.00466.pdf\">new method<\/a><\/span>\u00a0(known as spherical harmonic decomposition) with the SKA prototype in the Southern Hemisphere. This method will allow for the observation of a broad set of scale sizes within one observation, instead of requiring a combination of different single-dishes and interferometers.<\/p>\n<\/div><div class=\"fusion-clearfix\"><\/div><\/div><\/div><\/div><\/div>\n","protected":false},"excerpt":{"rendered":"","protected":false},"author":223,"featured_media":28830,"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-28820","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":"<!-- This site is optimized with the Yoast SEO plugin v23.8 - 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