{"id":15840,"date":"2018-08-17T08:58:21","date_gmt":"2018-08-17T08:58:21","guid":{"rendered":"https:\/\/www.revoscience.com\/en\/?p=15840"},"modified":"2020-06-09T12:52:32","modified_gmt":"2020-06-09T12:52:32","slug":"sprawling-galaxy-cluster-found-hiding-in-plain-sight","status":"publish","type":"post","link":"https:\/\/www.revoscience.com\/en\/sprawling-galaxy-cluster-found-hiding-in-plain-sight\/","title":{"rendered":"Sprawling galaxy cluster found hiding in plain sight"},"content":{"rendered":"

\"\"MIT scientists have uncovered a sprawling new galaxy cluster hiding in plain sight. The cluster, which sits a mere 2.4 billion light years from Earth, is made up of hundreds of individual galaxies and surrounds an extremely active supermassive black hole, or quasar.<\/span><\/p>\n

The central quasar goes by the name PKS1353-341 and is intensely bright \u2014 so bright that for decades astronomers observing it in the night sky have assumed that the quasar was quite alone in its corner of the universe, shining out as a solitary light source from the center of a single galaxy. \u00a0<\/span><\/p>\n

But as the MIT team reports today in the\u00a0Astrophysical Journal<\/a><\/em>, the quasar\u2019s light is so bright that it has obscured hundreds of galaxies clustered around it.<\/span><\/p>\n

In their new analysis, the researchers estimate that there are hundreds of individual galaxies in the cluster, which, all told, is about as massive as 690 trillion suns. Our Milky Way galaxy, for comparison, weighs in at around 400 billion solar masses. \u00a0<\/span><\/p>\n

The team also calculates that the quasar at the center of the cluster is 46 billion times brighter than the sun. Its extreme luminosity is likely the result of a temporary feeding frenzy: As an immense disk of material swirls around the quasar, big chunks of matter from the disk are falling in and feeding it, causing the black hole to radiate huge amounts of energy out as light.<\/span><\/p>\n

\u201cThis might be a short-lived phase that clusters go through, where the central black hole has a quick meal, gets bright, and then fades away again,\u201d says study author Michael McDonald, assistant professor of physics in MIT\u2019s Kavli Institute for Astrophysics and Space Research. \u201cThis could be a blip that we just happened to see. In a million years, this might look like a diffuse fuzzball.\u201d<\/span><\/p>\n

McDonald and his colleagues believe the discovery of this hidden cluster shows there may be other similar galaxy clusters hiding behind extremely bright objects that astronomers have miscatalogued as single light sources. The researchers are now looking for more hidden galaxy clusters, which could be important clues to estimating how much matter there is in the universe and how fast the universe is expanding.<\/span><\/p>\n

The paper\u2019s co-authors include lead author and MIT graduate student Taweewat Somboonpanyakul, Henry Lin of Princeton University, Brian Stalder of the Large Synoptic Survey Telescope, and Antony Stark of the Harvard-Smithsonian Center for Astrophysics.<\/span><\/p>\n

Fluffs or points<\/strong><\/span><\/p>\n

In 2012, McDonald and others discovered the Phoenix cluster, one of the most massive and luminous galaxy clusters in the universe. The mystery to McDonald was why this cluster, which was so intensely bright and in a region of the sky that is easily observable, hadn\u2019t been found before.<\/span><\/p>\n

\u201cWe started asking ourselves why we had not found it earlier, because it\u2019s very extreme in its properties and very bright,\u201d McDonald says. \u201cIt\u2019s because we had preconceived notions of what a cluster should look like. And this didn\u2019t conform to that, so we missed it.\u201d<\/span><\/p>\n

For the most part, he says astronomers have assumed that galaxy clusters look \u201cfluffy,\u201d giving off a very diffuse signal in the X-ray band, unlike brighter, point-like sources, which have been interpreted as extremely active quasars or black holes.<\/span><\/p>\n

\u201cThe images are either all points, or fluffs, and the fluffs are these giant million-light-year balls of hot gas that we call clusters, and the points are black holes that are accreting gas and glowing as this gas spirals in,\u201d McDonald says. \u201cThis idea that you could have a rapidly accreting black hole at the center of a cluster \u2014 we didn\u2019t think that was something that happened in nature.\u201d<\/span><\/p>\n

But the Phoenix discovery proved that galaxy clusters could indeed host immensely active black holes, prompting McDonald to wonder: Could there be other nearby galaxy clusters that were simply misidentified?<\/span><\/p>\n

An extreme eater<\/strong><\/span><\/p>\n

To answer that question, the researchers set up a survey named CHiPS, for Clusters Hiding in Plain Sight, which is designed to reevaluate X-ray images taken in the past.<\/span><\/p>\n

\u201cWe start from archival data of point sources, or objects that were super bright in the sky,\u201d Somboonpanyakul explains. \u201cWe are looking for point sources inside fluffy things.\u201d<\/span><\/p>\n

For every point source that was previously identified, the researchers noted their coordinates and then studied them more directly using the Magellan Telescope, a powerful optical telescope that sits in the mountains of Chile. If they observed a higher-than-expected number of galaxies surrounding the point source (a sign that the gas may stem from a cluster of galaxies), the researchers looked at the source again, using NASA\u2019s space-based Chandra X-Ray Observatory, to identify an extended, diffuse source around the main point source.<\/span><\/p>\n

\u201cSome 90 percent of these sources turned out to not be clusters,\u201d McDonald says. \u201cBut the fun thing is, the small number of things we are finding are sort of rule-breakers.\u201d<\/span><\/p>\n

The new paper reports the first results of the CHiPS survey, which has so far confirmed one new galaxy cluster hosting an extremely active central black hole.<\/span><\/p>\n

\u201cThe brightness of the black hole might be related to how much it\u2019s eating,\u201d McDonald says. \u201cThis is thousands of times brighter than a typical black hole at the center of a cluster, so it\u2019s very extreme in its feeding. We have no idea how long this has been going on or will continue to go on. Finding more of these things will help us understand, is this an important process, or just a weird thing that there\u2019s only one of in the universe.\u201d<\/span><\/p>\n

The team plans to comb through more X-ray data in search of galaxy clusters that might have been missed the first time around.<\/span><\/p>\n

\u201cIf the CHiPS survey can find enough of these, we will be able to pinpoint the specific rate of accretion onto the black hole where it switches from generating primarily radiation to generating mechanical energy, the two primary forms of<\/span><\/p>\n

energy output from black holes,\u201d says Brian McNamara, professor of physics and astronomy at the University of Waterloo, who was not involved in the research. \u201cThis particular object is interesting because it bucks the trend. Either the central supermassive black hole\u2019s mass is much lower than expected, or the structure of the accretion flow is abnormal. The oddballs are the ones that teach us the most.\u201d<\/span><\/p>\n

In addition to shedding light on a black hole\u2019s feeding, or accretion behavior, the detection of more galaxy clusters may help to estimate how fast the universe is expanding.<\/span><\/p>\n

\u201cTake for instance, the Titanic,\u201d McDonald says. \u201cIf you know where the two biggest pieces landed, you could map them backward to see where the ship hit the iceberg. In the same way, if you know where all the galaxy clusters are in the universe, which are the biggest pieces in the universe, and how big they are, and you have some information about what the universe looked like in the beginning, which we know from the Big Bang, then you could map out how the universe expanded.\u201d<\/span><\/p>\n

This research was supported, in part, by the Kavli Research Investment Fund at MIT, and by NASA.<\/span><\/p>\n

<\/p>\n","protected":false},"excerpt":{"rendered":"

MIT scientists have uncovered a sprawling new galaxy cluster hiding in plain sight. The cluster, which sits a mere 2.4 billion light years from Earth, is made up of hundreds of individual galaxies and surrounds an extremely active supermassive black hole, or quasar.<\/p>\n","protected":false},"author":2,"featured_media":15841,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[17],"tags":[],"class_list":["post-15840","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-research"],"featured_image_urls":{"full":["https:\/\/www.revoscience.com\/en\/wp-content\/uploads\/2018\/08\/MIT-Hidden-Galaxy_1.jpg",639,426,false],"thumbnail":["https:\/\/www.revoscience.com\/en\/wp-content\/uploads\/2018\/08\/MIT-Hidden-Galaxy_1-200x200.jpg",200,200,true],"medium":["https:\/\/www.revoscience.com\/en\/wp-content\/uploads\/2018\/08\/MIT-Hidden-Galaxy_1-300x200.jpg",300,200,true],"medium_large":["https:\/\/www.revoscience.com\/en\/wp-content\/uploads\/2018\/08\/MIT-Hidden-Galaxy_1.jpg",639,426,false],"large":["https:\/\/www.revoscience.com\/en\/wp-content\/uploads\/2018\/08\/MIT-Hidden-Galaxy_1.jpg",639,426,false],"1536x1536":["https:\/\/www.revoscience.com\/en\/wp-content\/uploads\/2018\/08\/MIT-Hidden-Galaxy_1.jpg",639,426,false],"2048x2048":["https:\/\/www.revoscience.com\/en\/wp-content\/uploads\/2018\/08\/MIT-Hidden-Galaxy_1.jpg",639,426,false],"ultp_layout_landscape_large":["https:\/\/www.revoscience.com\/en\/wp-content\/uploads\/2018\/08\/MIT-Hidden-Galaxy_1.jpg",639,426,false],"ultp_layout_landscape":["https:\/\/www.revoscience.com\/en\/wp-content\/uploads\/2018\/08\/MIT-Hidden-Galaxy_1.jpg",639,426,false],"ultp_layout_portrait":["https:\/\/www.revoscience.com\/en\/wp-content\/uploads\/2018\/08\/MIT-Hidden-Galaxy_1.jpg",600,400,false],"ultp_layout_square":["https:\/\/www.revoscience.com\/en\/wp-content\/uploads\/2018\/08\/MIT-Hidden-Galaxy_1.jpg",600,400,false],"newspaper-x-single-post":["https:\/\/www.revoscience.com\/en\/wp-content\/uploads\/2018\/08\/MIT-Hidden-Galaxy_1.jpg",639,426,false],"newspaper-x-recent-post-big":["https:\/\/www.revoscience.com\/en\/wp-content\/uploads\/2018\/08\/MIT-Hidden-Galaxy_1.jpg",540,360,false],"newspaper-x-recent-post-list-image":["https:\/\/www.revoscience.com\/en\/wp-content\/uploads\/2018\/08\/MIT-Hidden-Galaxy_1.jpg",95,63,false],"web-stories-poster-portrait":["https:\/\/www.revoscience.com\/en\/wp-content\/uploads\/2018\/08\/MIT-Hidden-Galaxy_1.jpg",639,426,false],"web-stories-publisher-logo":["https:\/\/www.revoscience.com\/en\/wp-content\/uploads\/2018\/08\/MIT-Hidden-Galaxy_1.jpg",96,64,false],"web-stories-thumbnail":["https:\/\/www.revoscience.com\/en\/wp-content\/uploads\/2018\/08\/MIT-Hidden-Galaxy_1.jpg",150,100,false]},"author_info":{"info":["RevoScience"]},"category_info":"Research<\/a>","tag_info":"Research","comment_count":"0","_links":{"self":[{"href":"https:\/\/www.revoscience.com\/en\/wp-json\/wp\/v2\/posts\/15840","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.revoscience.com\/en\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.revoscience.com\/en\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.revoscience.com\/en\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/www.revoscience.com\/en\/wp-json\/wp\/v2\/comments?post=15840"}],"version-history":[{"count":0,"href":"https:\/\/www.revoscience.com\/en\/wp-json\/wp\/v2\/posts\/15840\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.revoscience.com\/en\/wp-json\/wp\/v2\/media\/15841"}],"wp:attachment":[{"href":"https:\/\/www.revoscience.com\/en\/wp-json\/wp\/v2\/media?parent=15840"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.revoscience.com\/en\/wp-json\/wp\/v2\/categories?post=15840"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.revoscience.com\/en\/wp-json\/wp\/v2\/tags?post=15840"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}