{"id":3275,"date":"2019-05-27T15:05:33","date_gmt":"2019-05-27T09:35:33","guid":{"rendered":"https:\/\/triumphias.com\/blog\/?p=3275"},"modified":"2019-05-27T15:05:33","modified_gmt":"2019-05-27T09:35:33","slug":"heart-of-darkness-mysterious-origins-of-primordial-supermassive-black-holes-weekend-feature","status":"publish","type":"post","link":"https:\/\/triumphias.com\/blog\/heart-of-darkness-mysterious-origins-of-primordial-supermassive-black-holes-weekend-feature\/","title":{"rendered":"\u201cHeart of Darkness\u201d \u2013Mysterious Origins of Primordial Supermassive Black Holes (Weekend Feature)"},"content":{"rendered":"<p><strong>Relevant for prelims and GS paper 3(S and T):-<\/strong><\/p>\n<p>How supermassive black holes formed at the birth of a galaxy \u201cis one of the last great mysteries of the early universe,\u201d said Kirk S. S. Barrow with Georgia Tech\u2019s School of Physics. The European Space Agency (ESA) hopes to soon provide the answer, as well as how \u2018ordinary\u2019 matter assembles, along with the invisible dark matter, to form the wispy \u2018dark web\u2019 that pervades the universe by combining the observing power of two missions, Athena (the largest X-ray observatory ever built) and LISA.<\/p>\n<p><span id=\"more-17545\"><\/span>\u201c<a href=\"http:\/\/sci.esa.int\/athena\/59896-mission-summary\/\" target=\"_blank\" rel=\"noopener\">Athena<\/a>\u00a0is going to measure several hundreds of thousands of black holes, from relatively nearby to far away, observing the X-ray emission from the million-degree-hot matter in their surroundings,\u201d says\u00a0<a href=\"https:\/\/www.cosmos.esa.int\/web\/personal-profiles\/matteo-guainazzi\" target=\"_blank\" rel=\"noopener\">Matteo Guainazzi<\/a>, Athena study scientist at ESA. \u201cWe are in particular interested in the most distant black holes, those that formed in the first few hundred million years of the Universe\u2019s history, and we hope we\u2019ll be able to finally understand how they formed.\u201d<\/p>\n<p>Supermassive black holes, with masses ranging from millions to billions of Suns, sit at the core of most massive galaxies across the Universe. We don\u2019t know exactly how these huge, enormously dense objects took shape, nor what triggers a fraction of them to start devouring the surrounding matter at extremely intense rates, radiating copiously across the electromagnetic spectrum and turning their host galaxies into \u2018active galactic nuclei\u2019.<\/p>\n<blockquote class=\"wp-embedded-content\" data-secret=\"oFsZ0bLAUt\"><p><a href=\"http:\/\/dailygalaxy.com\/2018\/09\/one-of-the-last-great-mysteries-which-came-first-galaxies-or-supermassive-black-holes\/\" target=\"_blank\" rel=\"noopener\">\u201cOne of the Last Great Mysteries\u201d \u2013Which Came First? Galaxies or Supermassive Black Holes<\/a><\/p><\/blockquote>\n<p><iframe loading=\"lazy\" class=\"wp-embedded-content\" title=\"\u201c\u201cOne of the Last Great Mysteries\u201d \u2013Which Came First? Galaxies or Supermassive Black Holes\u201d \u2014 The Daily Galaxy\" src=\"http:\/\/dailygalaxy.com\/2018\/09\/one-of-the-last-great-mysteries-which-came-first-galaxies-or-supermassive-black-holes\/embed\/#?secret=oFsZ0bLAUt\" width=\"500\" height=\"282\" frameborder=\"0\" marginwidth=\"0\" marginheight=\"0\" scrolling=\"no\" sandbox=\"allow-scripts\" data-secret=\"oFsZ0bLAUt\" data-mce-fragment=\"1\"><\/iframe><\/p>\n<p>Tackling these open questions in modern astrophysics is among the main goals of two future missions in ESA\u2019s space science program: Athena, the Advanced Telescope for High-ENergy Astrophysics, and LISA, the Laser Interferometer Space Antenna. Currently in the study phase, both missions are scheduled for launch in the early 2030s.<\/p>\n<p>\u201cAthena and LISA are both outstanding missions set to make breakthroughs in many areas of astrophysics,\u201d says G\u00fcnther Hasinger, ESA Director of Science. \u201cBut there is one extremely exciting experiment that we could only perform if both missions are operational at the same time for at least a few years: bringing sound to the \u2018cosmic movies\u2019 by observing the merger of supermassive black holes both in X-rays and gravitational waves. With this unique opportunity to perform unprecedented observations of one of the most fascinating phenomena in the cosmos, the synergy between Athena and LISA would greatly increase the scientific return from both missions, ensuring European leadership in a key, novel area of research.\u201d<\/p>\n<blockquote class=\"wp-embedded-content\" data-secret=\"2xfpr5ErEE\"><p><a href=\"http:\/\/dailygalaxy.com\/2018\/08\/primordial-mystery-infant-galaxies-harboring-supermassive-black-holes\/\" target=\"_blank\" rel=\"noopener\">\u201cPrimordial Mystery\u201d \u2013Infant Galaxies Harboring Supermassive Black Holes<\/a><\/p><\/blockquote>\n<p><iframe loading=\"lazy\" class=\"wp-embedded-content\" title=\"\u201c\u201cPrimordial Mystery\u201d \u2013Infant Galaxies Harboring Supermassive Black Holes\u201d \u2014 The Daily Galaxy\" src=\"http:\/\/dailygalaxy.com\/2018\/08\/primordial-mystery-infant-galaxies-harboring-supermassive-black-holes\/embed\/#?secret=2xfpr5ErEE\" width=\"500\" height=\"282\" frameborder=\"0\" marginwidth=\"0\" marginheight=\"0\" scrolling=\"no\" sandbox=\"allow-scripts\" data-secret=\"2xfpr5ErEE\" data-mce-fragment=\"1\"><\/iframe><\/p>\n<p>Meanwhile,\u00a0<a href=\"https:\/\/lisa.nasa.gov\/\" target=\"_blank\" rel=\"noopener\">LISA<\/a>\u00a0will be the first space-borne observatory of gravitational waves\u2014fluctuations in the fabric of spacetime produced by the acceleration of cosmic objects with very strong gravity fields, like pairs of merging black holes.<\/p>\n<p>Gravitational-wave astronomy, inaugurated only a few years ago, is currently limited to the high-frequency waves that can be probed by ground-based experiments like LIGO and Virgo. These experiments are sensitive to the mergers of relatively small black holes\u2014a few times to a few tens of times more massive than the Sun. LISA will expand these studies by detecting low-frequency gravitational waves, such as the ones released when two supermassive black holes collide during a merger of galaxies.<\/p>\n<p>\u201cLISA will be the first mission of its kind, looking primarily for gravitational waves coming from supermassive black holes smashing into one another,\u201d explains Paul McNamara, LISA study scientist at ESA. \u201cThis is one of the most energetic phenomena we know of, releasing more energy than all the quiescent Universe does at any time. If two supermassive black holes merge anywhere in the cosmos, LISA will see it.\u201d<\/p>\n<blockquote class=\"wp-embedded-content\" data-secret=\"2Ut1xdtBNC\"><p><a href=\"http:\/\/dailygalaxy.com\/2018\/06\/ancient-red-nuggets-detected-relics-of-the-1st-massive-galaxies-in-the-universe-with-gigantic-superm\/\" target=\"_blank\" rel=\"noopener\">Ancient \u201cRed Nuggets\u201d Detected \u2013Relics of the 1st Massive Galaxies in the Universe with Gigantic Supermassive Black Holes<\/a><\/p><\/blockquote>\n<p><iframe loading=\"lazy\" class=\"wp-embedded-content\" title=\"\u201cAncient \u201cRed Nuggets\u201d Detected \u2013Relics of the 1st Massive Galaxies in the Universe with Gigantic Supermassive Black Holes\u201d \u2014 The Daily Galaxy\" src=\"http:\/\/dailygalaxy.com\/2018\/06\/ancient-red-nuggets-detected-relics-of-the-1st-massive-galaxies-in-the-universe-with-gigantic-superm\/embed\/#?secret=2Ut1xdtBNC\" width=\"500\" height=\"282\" frameborder=\"0\" marginwidth=\"0\" marginheight=\"0\" scrolling=\"no\" sandbox=\"allow-scripts\" data-secret=\"2Ut1xdtBNC\" data-mce-fragment=\"1\"><\/iframe><\/p>\n<p>The first few gravitational wave events detected by LIGO and Virgo between 2015 and 2017 all originated from pairs of stellar-mass black holes, which are known to not radiate any light upon coalescence. Then, in August 2017, gravitational waves coming from a different source\u2014the merger of two neutron stars\u2014were discovered.<\/p>\n<p>This time, the gravitational waves were accompanied by radiation across the electromagnetic spectrum, readily observed with a multitude of telescopes on Earth and in space. By combining information from the various types of observations in an approach known as multi-messenger astronomy, scientists could delve into the details of this never-before-observed phenomenon.<\/p>\n<blockquote class=\"wp-embedded-content\" data-secret=\"zhKEWaOqjM\"><p><a href=\"http:\/\/dailygalaxy.com\/2018\/03\/glow-from-hidden-population-of-pulsars-detected-near-center-of-our-galaxy\/\" target=\"_blank\" rel=\"noopener\">Glow From Hidden Population of Pulsars Detected Near Center of the Milky Way<\/a><\/p><\/blockquote>\n<p><iframe loading=\"lazy\" class=\"wp-embedded-content\" title=\"\u201cGlow From Hidden Population of Pulsars Detected Near Center of the Milky Way\u201d \u2014 The Daily Galaxy\" src=\"http:\/\/dailygalaxy.com\/2018\/03\/glow-from-hidden-population-of-pulsars-detected-near-center-of-our-galaxy\/embed\/#?secret=zhKEWaOqjM\" width=\"500\" height=\"282\" frameborder=\"0\" marginwidth=\"0\" marginheight=\"0\" scrolling=\"no\" sandbox=\"allow-scripts\" data-secret=\"zhKEWaOqjM\" data-mce-fragment=\"1\"><\/iframe><\/p>\n<p>With Athena and LISA together, we would be able to apply multi-messenger astronomy to supermassive black holes for the first time. Simulations predict that their mergers, unlike those of their stellar-mass counterparts, emit both gravitational waves and radiation\u2014the latter originating in the hot, interstellar gas of the two colliding galaxies stirred by the black holes pair when they fall towards one another.<\/p>\n<p>LISA will detect the gravitational waves emitted by the spiralling black holes about a month before their final coalescence, when they are still separated by a distance equivalent to several times their radii. Scientists expect that a fraction of the mergers found by LISA, especially those within distances of a few billion light years from us, will give rise to an X-ray signal that can be eventually seen by Athena.<\/p>\n<blockquote class=\"wp-embedded-content\" data-secret=\"MCmL7Vkyfo\"><p><a href=\"http:\/\/dailygalaxy.com\/2019\/01\/dark-matter-emerged-from-an-eon-before-the-big-bang-weekend-feature\/\" target=\"_blank\" rel=\"noopener\">Dark Matter \u2013\u201cEmerged From an Eon Before the Big Bang\u201d (Weekend Feature)<\/a><\/p><\/blockquote>\n<p><iframe loading=\"lazy\" class=\"wp-embedded-content\" title=\"\u201cDark Matter \u2013\u201cEmerged From an Eon Before the Big Bang\u201d (Weekend Feature)\u201d \u2014 The Daily Galaxy\" src=\"http:\/\/dailygalaxy.com\/2019\/01\/dark-matter-emerged-from-an-eon-before-the-big-bang-weekend-feature\/embed\/#?secret=MCmL7Vkyfo\" width=\"500\" height=\"282\" frameborder=\"0\" marginwidth=\"0\" marginheight=\"0\" scrolling=\"no\" sandbox=\"allow-scripts\" data-secret=\"MCmL7Vkyfo\" data-mce-fragment=\"1\"><\/iframe><\/p>\n<p>\u201cWhen LISA first detects a signal, we won\u2019t know yet where exactly it\u2019s coming from, because LISA is an all-sky sensor, so it works more like a microphone than a telescope,\u201d explains Paul.<\/p>\n<p>\u201cHowever, as the black holes inspiral towards each other, the amplitude of their gravitational wave signal increases. This, coupled with the motion of the satellites along their orbits, will allow LISA to gradually improve the localisation of the source in the sky, up until the time when the black holes finally merge.\u201d<\/p>\n<p>A few days before the final phase of the merger, the gravitational wave data will constrain the position of the source to a patch on the sky measuring about 10 square degrees\u2014roughly 50 times the area of the full Moon. This is still pretty large, but would allow Athena to start scanning the sky to search for an X-ray signal from this titanic clash. Simulations indicate that the two spiralling black holes modulate the motion of the surrounding gas, so it is likely that the X-ray signature will have a frequency commensurate to that of the gravitational wave signal.<\/p>\n<p>Then, just a few hours before the final coalescence of the black holes, LISA can provide a much more precise indication in the sky, roughly the size of the field of view of Athena\u2019s Wide Field Imager (WFI), so the X-ray observatory can directly point towards the source.<\/p>\n<p>\u201cCatching the X-ray signal before the black holes become one will be very challenging, but we are pretty confident that we can make a detection during and after the merger,\u201d explains Matteo.<\/p>\n<p>\u201cWe could see the emergence of a new X-ray source, and perhaps witness the birth of an active galactic nucleus, with jets of high-energy particles being launched at close to the speed of light above and beyond the newly formed black hole.\u201d<\/p>\n<p>We have never observed merging supermassive black holes\u2014we do not yet have the facilities for such observations. First, we need LISA to detect the gravitational waves and tell us where to look in the sky; then we need Athena to observe it with high precision in X-rays to see how the mighty collision affects the gas surrounding the black holes. We can use theory and simulations to predict what might happen, but we need to combine these two great missions to find out.<\/p>\n<p>&nbsp;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Relevant for prelims and GS paper 3(S and T):- How supermassive black holes formed at the birth of a galaxy<\/p>\n","protected":false},"author":1,"featured_media":3179,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_exactmetrics_skip_tracking":false,"_exactmetrics_sitenote_active":false,"_exactmetrics_sitenote_note":"","_exactmetrics_sitenote_category":0,"footnotes":""},"categories":[1],"tags":[136,817,413,392],"class_list":["post-3275","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-miscellaneous","tag-current-affairs","tag-gs","tag-ias","tag-union-public-service-commission-upsc"],"amp_enabled":true,"_links":{"self":[{"href":"https:\/\/triumphias.com\/blog\/wp-json\/wp\/v2\/posts\/3275","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/triumphias.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/triumphias.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/triumphias.com\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/triumphias.com\/blog\/wp-json\/wp\/v2\/comments?post=3275"}],"version-history":[{"count":1,"href":"https:\/\/triumphias.com\/blog\/wp-json\/wp\/v2\/posts\/3275\/revisions"}],"predecessor-version":[{"id":3276,"href":"https:\/\/triumphias.com\/blog\/wp-json\/wp\/v2\/posts\/3275\/revisions\/3276"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/triumphias.com\/blog\/wp-json\/wp\/v2\/media\/3179"}],"wp:attachment":[{"href":"https:\/\/triumphias.com\/blog\/wp-json\/wp\/v2\/media?parent=3275"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/triumphias.com\/blog\/wp-json\/wp\/v2\/categories?post=3275"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/triumphias.com\/blog\/wp-json\/wp\/v2\/tags?post=3275"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}