{"id":15903,"date":"2018-04-25T13:00:47","date_gmt":"2018-04-25T17:00:47","guid":{"rendered":"http:\/\/hobbyspace.com\/Blog\/?p=15903"},"modified":"2018-04-23T14:05:46","modified_gmt":"2018-04-23T18:05:46","slug":"eso-ancient-galactic-megamergers-observed","status":"publish","type":"post","link":"https:\/\/hobbyspace.com\/Blog\/?p=15903","title":{"rendered":"ESO: Ancient galactic megamergers observed"},"content":{"rendered":"<p>The latest report from <a href=\"https:\/\/www.eso.org\/public\/news\/eso1812\/?lang\" target=\"_d\">ESO<\/a> (European Southern Observatory);<\/p>\n<p style=\"text-align: center;\"><strong><a href=\"https:\/\/www.eso.org\/public\/news\/eso1812\/?lang\" target=\"_blank\" rel=\"noopener\">Ancient Galaxy Megamergers<\/a>\u00a0<\/strong><\/p>\n<figure id=\"attachment_15904\" aria-describedby=\"caption-attachment-15904\" style=\"width: 500px\" class=\"wp-caption aligncenter\"><a href=\"https:\/\/www.eso.org\/public\/images\/eso1812a\/\" target=\"_blank\" rel=\"noopener\"><img loading=\"lazy\" decoding=\"async\" data-attachment-id=\"15904\" data-permalink=\"https:\/\/hobbyspace.com\/Blog\/?attachment_id=15904\" data-orig-file=\"https:\/\/hobbyspace.com\/Blog\/wp-content\/uploads\/2018\/04\/eso1812a1.jpg\" data-orig-size=\"700,464\" data-comments-opened=\"0\" data-image-meta=\"{&quot;aperture&quot;:&quot;0&quot;,&quot;credit&quot;:&quot;ESO\/M. Kornmesser&quot;,&quot;camera&quot;:&quot;&quot;,&quot;caption&quot;:&quot;This artist\\u2019\\u2019s impression of SPT2349-56\\u00a0shows a group of interacting and merging galaxies in the early Universe. Such mergers have been spotted using the ALMA and APEX telescopes and represent the formation of galaxies clusters, the most massive objects in the modern Universe. Astronomers thought that these events occurred around three billion years after the Big Bang, so they were surprised when the new observations revealed them happening when the Universe was only half that age!&quot;,&quot;created_timestamp&quot;:&quot;1524682800&quot;,&quot;copyright&quot;:&quot;&quot;,&quot;focal_length&quot;:&quot;0&quot;,&quot;iso&quot;:&quot;0&quot;,&quot;shutter_speed&quot;:&quot;0&quot;,&quot;title&quot;:&quot;Artist\\u2019s impression of ancient galaxy megamerger&quot;,&quot;orientation&quot;:&quot;0&quot;}\" data-image-title=\"Artist\u2019s impression of ancient galaxy megamerger\" data-image-description=\"\" data-image-caption=\"&lt;p&gt;This artist\u2019\u2019s impression of SPT2349-56\u00a0shows a group of interacting and merging galaxies in the early Universe. Such mergers have been spotted using the ALMA and APEX telescopes and represent the formation of galaxies clusters, the most massive objects in the modern Universe. Astronomers thought that these events occurred around three billion years after the Big Bang, so they were surprised when the new observations revealed them happening when the Universe was only half that age!&lt;\/p&gt;\n\" data-large-file=\"https:\/\/hobbyspace.com\/Blog\/wp-content\/uploads\/2018\/04\/eso1812a1.jpg\" class=\"wp-image-15904\" src=\"http:\/\/hobbyspace.com\/Blog\/wp-content\/uploads\/2018\/04\/eso1812a1.jpg\" alt=\"\" width=\"500\" height=\"331\" srcset=\"https:\/\/hobbyspace.com\/Blog\/wp-content\/uploads\/2018\/04\/eso1812a1.jpg 700w, https:\/\/hobbyspace.com\/Blog\/wp-content\/uploads\/2018\/04\/eso1812a1-300x199.jpg 300w\" sizes=\"auto, (max-width: 500px) 100vw, 500px\" \/><\/a><figcaption id=\"caption-attachment-15904\" class=\"wp-caption-text\"><em>This artist\u2019\u2019s impression of SPT2349-56\u00a0shows a group of interacting and merging galaxies in the early Universe. Such mergers have been spotted using the ALMA and APEX telescopes and represent the formation of galaxies clusters, the most massive objects in the modern Universe. Astronomers thought that these events occurred around three billion years after the Big Bang, so they were surprised when the new observations revealed them happening when the Universe was only half that age! [<a href=\"https:\/\/www.eso.org\/public\/images\/eso1812a\/\" target=\"_blank\" rel=\"noopener\">Higher-res images<\/a>]<\/em><\/figcaption><\/figure>\n<p class=\"text_intro pr_first\">The ALMA and APEX telescopes have peered deep into space \u2014 back to the time when the Universe was one tenth of its current age \u2014 and witnessed the beginnings of gargantuan cosmic pileups: the impending collisions of young, starburst galaxies. Astronomers thought that these events occurred around three billion years after the Big Bang, so they were surprised when the new observations revealed them happening when the Universe was only half that age! These ancient systems of galaxies are thought to be building the most massive structures in the known Universe: galaxy clusters.<\/p>\n<p dir=\"ltr\">Using the\u00a0<a href=\"http:\/\/www.eso.org\/public\/teles-instr\/alma\/\" target=\"_blank\" rel=\"noopener\">Atacama Large Millimeter\/submillimeter Array<\/a>\u00a0(ALMA) and the\u00a0<a href=\"http:\/\/www.eso.org\/public\/teles-instr\/apex\/\" target=\"_blank\" rel=\"noopener\">Atacama Pathfinder Experiment<\/a>\u00a0(APEX), two international teams of scientists led by Tim Miller from Dalhousie University in Canada and Yale University in the US and Iv\u00e1n Oteo from the University of Edinburgh, United Kingdom, have uncovered startlingly dense concentrations of galaxies that are poised to merge, forming the cores of what will eventually become colossal galaxy clusters.<\/p>\n<p><span class=\"embed-youtube\" style=\"text-align:center; display: block;\"><iframe loading=\"lazy\" class=\"youtube-player\" width=\"1600\" height=\"900\" src=\"https:\/\/www.youtube.com\/embed\/FmBVOmELaeQ?version=3&#038;rel=1&#038;showsearch=0&#038;showinfo=1&#038;iv_load_policy=1&#038;fs=1&#038;hl=en&#038;autohide=2&#038;wmode=transparent\" allowfullscreen=\"true\" style=\"border:0;\" sandbox=\"allow-scripts allow-same-origin allow-popups allow-presentation allow-popups-to-escape-sandbox\"><\/iframe><\/span><\/p>\n<p dir=\"ltr\">Peering 90% of the way across the observable Universe, the Miller team observed a galaxy protocluster named SPT2349-56. The light from this object began travelling to us when the Universe was about a tenth of its current age.<\/p>\n<p dir=\"ltr\">The individual galaxies in this dense cosmic pileup are\u00a0<a href=\"https:\/\/en.wikipedia.org\/wiki\/Starburst_galaxy\" target=\"_blank\" rel=\"noopener\">starburst galaxies<\/a>\u00a0and the concentration of vigorous star formation in such a compact region makes this by far the most active region ever observed in the young Universe. Thousands of stars are born there every year, compared to just one in our own Milky Way.<\/p>\n<figure id=\"attachment_15905\" aria-describedby=\"caption-attachment-15905\" style=\"width: 520px\" class=\"wp-caption aligncenter\"><a href=\"https:\/\/www.eso.org\/public\/images\/eso1812b\/\" target=\"_blank\" rel=\"noopener\"><img loading=\"lazy\" decoding=\"async\" data-attachment-id=\"15905\" data-permalink=\"https:\/\/hobbyspace.com\/Blog\/?attachment_id=15905\" data-orig-file=\"https:\/\/hobbyspace.com\/Blog\/wp-content\/uploads\/2018\/04\/eso1812b1.jpg\" data-orig-size=\"1280,455\" data-comments-opened=\"0\" data-image-meta=\"{&quot;aperture&quot;:&quot;0&quot;,&quot;credit&quot;:&quot;ESO\/ALMA (ESO\/NAOJ\/NRAO)\/Miller&quot;,&quot;camera&quot;:&quot;&quot;,&quot;caption&quot;:&quot;This montage shows three views of a distant group of interacting and merging galaxies in the early Universe. The left image is a wide view from the South Pole Telescope that reveals just a bright spot. The central view is from Atacama Pathfinder Experiment (APEX) that reveals more details. The right picture is from the Atacama Large Millimeter\/submillimeter Array (ALMA) and reveals that the object is actually a group of 14 merging galaxies in the process of forming a galaxy cluster.&quot;,&quot;created_timestamp&quot;:&quot;1524682800&quot;,&quot;copyright&quot;:&quot;&quot;,&quot;focal_length&quot;:&quot;0&quot;,&quot;iso&quot;:&quot;0&quot;,&quot;shutter_speed&quot;:&quot;0&quot;,&quot;title&quot;:&quot;Images of a galaxy protocluster from SPT, APEX and ALMA&quot;,&quot;orientation&quot;:&quot;0&quot;}\" data-image-title=\"Images of a galaxy protocluster from SPT, APEX and ALMA\" data-image-description=\"\" data-image-caption=\"&lt;p&gt;This montage shows three views of a distant group of interacting and merging galaxies in the early Universe. The left image is a wide view from the South Pole Telescope that reveals just a bright spot. The central view is from Atacama Pathfinder Experiment (APEX) that reveals more details. The right picture is from the Atacama Large Millimeter\/submillimeter Array (ALMA) and reveals that the object is actually a group of 14 merging galaxies in the process of forming a galaxy cluster.&lt;\/p&gt;\n\" data-large-file=\"https:\/\/hobbyspace.com\/Blog\/wp-content\/uploads\/2018\/04\/eso1812b1-1024x364.jpg\" class=\"wp-image-15905 size-large\" src=\"http:\/\/hobbyspace.com\/Blog\/wp-content\/uploads\/2018\/04\/eso1812b1-1024x364.jpg\" alt=\"\" width=\"520\" height=\"185\" srcset=\"https:\/\/hobbyspace.com\/Blog\/wp-content\/uploads\/2018\/04\/eso1812b1-1024x364.jpg 1024w, https:\/\/hobbyspace.com\/Blog\/wp-content\/uploads\/2018\/04\/eso1812b1-300x107.jpg 300w, https:\/\/hobbyspace.com\/Blog\/wp-content\/uploads\/2018\/04\/eso1812b1-768x273.jpg 768w, https:\/\/hobbyspace.com\/Blog\/wp-content\/uploads\/2018\/04\/eso1812b1.jpg 1280w\" sizes=\"auto, (max-width: 520px) 100vw, 520px\" \/><\/a><figcaption id=\"caption-attachment-15905\" class=\"wp-caption-text\"><em>This montage shows three views of a distant group of interacting and merging galaxies in the early Universe. The left image is a wide view from the South Pole Telescope that reveals just a bright spot. The central view is from Atacama Pathfinder Experiment (APEX) that reveals more details. The right picture is from the Atacama Large Millimeter\/submillimeter Array (ALMA) and reveals that the object is actually a group of 14 merging galaxies in the process of forming a galaxy cluster. [<a href=\"https:\/\/www.eso.org\/public\/images\/eso1812b\/\" target=\"_blank\" rel=\"noopener\">Higher-res images<\/a>]<\/em><\/figcaption><\/figure>\n<p dir=\"ltr\">The Oteo team\u00a0<a href=\"https:\/\/arxiv.org\/abs\/1709.02809\" target=\"_blank\" rel=\"noopener\">discovered<\/a>\u00a0a similar megamerger formed by ten dusty star-forming galaxies, nicknamed a \u201cdusty red core\u201d because of its very red colour, by combining observations from ALMA and the APEX.<\/p>\n<p dir=\"ltr\">Iv\u00e1n Oteo explains why these objects are unexpected:<\/p>\n<p dir=\"ltr\" style=\"padding-left: 30px;\"><em>\u201cThe lifetime of dusty starbursts is thought to be relatively short, because they consume their gas at an extraordinary rate. At any time, in any corner of the Universe, these galaxies are usually in the minority. So, finding numerous dusty starbursts shining at the same time like this is very puzzling, and something that we still need to understand.\u201d<\/em><\/p>\n<p dir=\"ltr\">These forming galaxy clusters were first spotted as faint smudges of light, using the\u00a0<a href=\"https:\/\/pole.uchicago.edu\/\" target=\"_blank\" rel=\"noopener\">South Pole Telescope<\/a>\u00a0and the\u00a0<a href=\"http:\/\/sci.esa.int\/herschel\/\" target=\"_blank\" rel=\"noopener\">Herschel Space Observatory<\/a>. Subsequent ALMA and APEX observations showed that they had unusual structure and confirmed that their light originated much earlier than expected \u2014 only 1.5 billion years after the Big Bang.<\/p>\n<p><span class=\"embed-youtube\" style=\"text-align:center; display: block;\"><iframe loading=\"lazy\" class=\"youtube-player\" width=\"1600\" height=\"900\" src=\"https:\/\/www.youtube.com\/embed\/oK08iw2PlzY?version=3&#038;rel=1&#038;showsearch=0&#038;showinfo=1&#038;iv_load_policy=1&#038;fs=1&#038;hl=en&#038;autohide=2&#038;wmode=transparent\" allowfullscreen=\"true\" style=\"border:0;\" sandbox=\"allow-scripts allow-same-origin allow-popups allow-presentation allow-popups-to-escape-sandbox\"><\/iframe><\/span><\/p>\n<p dir=\"ltr\">The new high-resolution ALMA observations finally revealed that the two faint glows are not single objects, but are actually composed of fourteen and ten individual massive galaxies respectively, each within a radius comparable to the distance between the Milky Way and the neighbouring Magellanic Clouds.<\/p>\n<p dir=\"ltr\" style=\"padding-left: 30px;\">&#8220;<em>These discoveries by ALMA are only the tip of the iceberg. Additional observations with the APEX telescope show that the real number of star-forming galaxies is likely even three times higher. Ongoing observations with the MUSE instrument on ESO\u2019s VLT are also identifying additional galaxies,<\/em>\u201d<\/p>\n<p dir=\"ltr\">comments Carlos De Breuck, ESO astronomer.<\/p>\n<p dir=\"ltr\">Current theoretical and computer models suggest that protoclusters as massive as these should have taken much longer to evolve. By using data from ALMA, with its superior resolution and sensitivity, as input to sophisticated computer simulations, the researchers are able to study cluster formation less than 1.5 billion years after the Big Bang.<\/p>\n<p dir=\"ltr\" style=\"padding-left: 30px;\">&#8220;<em>How this assembly of galaxies got so big so fast is a mystery. It wasn\u2019t built up gradually over billions of years, as astronomers might expect. This discovery provides a great opportunity to study how massive galaxies came together to build enormous galaxy clusters,&#8221;\u00a0<\/em><\/p>\n<p dir=\"ltr\">says Tim Miller, a PhD candidate at Yale University and lead author of one of the papers.<\/p>\n<p style=\"text-align: center;\">====<\/p>\n<p style=\"text-align: center;\"><iframe loading=\"lazy\" style=\"border: none;\" src=\"\/\/rcm-na.amazon-adsystem.com\/e\/cm?o=1&amp;p=12&amp;l=ur1&amp;category=echo&amp;banner=146870N94VDD8MAPHT02&amp;f=ifr&amp;linkID=1a66b7640a95795359e192e9c202c69f&amp;t=hobbyspace&amp;tracking_id=hobbyspace\" width=\"300\" height=\"250\" frameborder=\"0\" marginwidth=\"0\" scrolling=\"no\"><\/iframe><\/p>\n","protected":false},"excerpt":{"rendered":"<p>The latest report from ESO (European Southern Observatory); Ancient Galaxy Megamergers\u00a0 The ALMA and APEX telescopes have peered deep into space \u2014 back to the time when the Universe was one tenth of its current age \u2014 and witnessed the beginnings of gargantuan cosmic pileups: the impending collisions of young, starburst galaxies. Astronomers thought that &hellip; <a href=\"https:\/\/hobbyspace.com\/Blog\/?p=15903\" class=\"more-link\">Continue reading <span class=\"screen-reader-text\">ESO: Ancient galactic megamergers observed<\/span> <span class=\"meta-nav\">&rarr;<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"jetpack_post_was_ever_published":false,"_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":false,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"_jetpack_memberships_contains_paid_content":false,"footnotes":""},"categories":[12],"tags":[],"class_list":["post-15903","post","type-post","status-publish","format-standard","hentry","category-astronomy"],"jetpack_featured_media_url":"","jetpack_sharing_enabled":true,"jetpack_shortlink":"https:\/\/wp.me\/p34aWK-48v","jetpack-related-posts":[{"id":11757,"url":"https:\/\/hobbyspace.com\/Blog\/?p=11757","url_meta":{"origin":15903,"position":0},"title":"ESO: The birth of monster giant galaxies in the early universe","author":"TopSpacer","date":"November 18, 2015","format":false,"excerpt":"A new report from\u00a0ESO\u00a0(European Southern Observatory): The Birth of Monsters VISTA pinpoints earliest giant galaxies ESO\u2019s VISTA survey telescope has spied a horde of previously hidden massive galaxies that existed when the Universe was in its infancy. By discovering and studying more of these galaxies than ever before, astronomers have,\u2026","rel":"","context":"In &quot;Astronomy&quot;","block_context":{"text":"Astronomy","link":"https:\/\/hobbyspace.com\/Blog\/?cat=12"},"img":{"alt_text":"ESO\u2019s VISTA survey telescope has spied a horde of previously hidden massive galaxies that existed when the Universe was in its infancy. By discovering and studying more of these galaxies than ever before, astronomers have for the first time found out exactly when such monster galaxies first appeared. The newly discovered massive galaxies are marked on this image of the UltraVISTA field.","src":"https:\/\/i0.wp.com\/hobbyspace.com\/Blog\/wp-content\/uploads\/2015\/11\/eso1545a1.jpg?resize=350%2C200","width":350,"height":200},"classes":[]},{"id":8827,"url":"https:\/\/hobbyspace.com\/Blog\/?p=8827","url_meta":{"origin":15903,"position":1},"title":"ESO: Possible explanation for why Milky Way-like galaxies are so common","author":"TopSpacer","date":"September 16, 2014","format":false,"excerpt":"A report from the European Southern Observatory (ESO): Violent Origins of Disc Galaxies Probed by ALMA New observations explain why Milky Way-like galaxies are so common in the Universe For decades scientists have believed that galaxy mergers usually result in the formation of elliptical galaxies. Now, for the the first\u2026","rel":"","context":"In &quot;Astronomy&quot;","block_context":{"text":"Astronomy","link":"https:\/\/hobbyspace.com\/Blog\/?cat=12"},"img":{"alt_text":"eso1429a","src":"https:\/\/i0.wp.com\/hobbyspace.com\/Blog\/wp-content\/uploads\/2014\/09\/eso1429a.jpg?resize=350%2C200","width":350,"height":200},"classes":[]},{"id":14054,"url":"https:\/\/hobbyspace.com\/Blog\/?p=14054","url_meta":{"origin":15903,"position":2},"title":"ESO: Early galaxies show much less dark matter than those formed later","author":"TopSpacer","date":"March 15, 2017","format":false,"excerpt":"A new report from\u00a0ESO\u00a0(European Southern Observatory: Dark Matter Less Influential in Galaxies in Early Universe New observations indicate that massive, star-forming galaxies during the peak epoch of galaxy formation, 10 billion years ago, were dominated by baryonic or \u201cnormal\u201d matter. This is in stark contrast to present-day galaxies, where the\u2026","rel":"","context":"In &quot;Astronomy&quot;","block_context":{"text":"Astronomy","link":"https:\/\/hobbyspace.com\/Blog\/?cat=12"},"img":{"alt_text":"","src":"https:\/\/i0.wp.com\/hobbyspace.com\/Blog\/wp-content\/uploads\/2017\/03\/eso1709a1.jpg?resize=350%2C200","width":350,"height":200},"classes":[]},{"id":22852,"url":"https:\/\/hobbyspace.com\/Blog\/?p=22852","url_meta":{"origin":15903,"position":3},"title":"ESO: Galaxies observed surrounding a supermassive black hole in early universe","author":"TopSpacer","date":"October 1, 2020","format":false,"excerpt":"The latest report from ESO (European Southern Observatory): ESO telescope spots galaxies trapped in the web of a supermassive black hole With the help of ESO\u2019s Very Large Telescope (VLT), astronomers have found six galaxies lying around a supermassive black hole when the Universe was less than a billion years\u2026","rel":"","context":"In &quot;Astronomy&quot;","block_context":{"text":"Astronomy","link":"https:\/\/hobbyspace.com\/Blog\/?cat=12"},"img":{"alt_text":"","src":"https:\/\/i0.wp.com\/hobbyspace.com\/Blog\/wp-content\/uploads\/2020\/09\/eso2016a1-500x300.jpg?resize=350%2C200&ssl=1","width":350,"height":200},"classes":[]},{"id":13341,"url":"https:\/\/hobbyspace.com\/Blog\/?p=13341","url_meta":{"origin":15903,"position":4},"title":"Hubble: Observable universe holds ten times more galaxies than previously thought","author":"TopSpacer","date":"October 13, 2016","format":false,"excerpt":"The latest\u00a0finding with the\u00a0Hubble space telescope: Observable Universe contains ten times more galaxies than previously thought Astronomers using data from the NASA\/ESA Hubble Space Telescopes and other telescopes have performed an accurate census of the number of galaxies in the Universe. 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