{"id":22949,"date":"2025-07-26T06:22:14","date_gmt":"2025-07-26T06:22:14","guid":{"rendered":"https:\/\/www.newsbeep.com\/au\/22949\/"},"modified":"2025-07-26T06:22:14","modified_gmt":"2025-07-26T06:22:14","slug":"intermediate-mass-black-hole-ngc-6099-hlx-1","status":"publish","type":"post","link":"https:\/\/www.newsbeep.com\/au\/22949\/","title":{"rendered":"Intermediate mass black hole NGC 6099 HLX 1"},"content":{"rendered":"

Astronomers using NASA\u2019s Hubble Space Telescope and Chandra X-ray Observatory have discovered a possible ‘missing link’ black hole, offering a rare glimpse of a cosmic heavyweight in the middle of a celestial meal.<\/p>\n

The newly identified object, named NGC 6099 HLX-1, sits 40,000 lightyears<\/a> from the centre of a giant elliptical galaxy located 450 million lightyears away in the constellation Hercules<\/a>.<\/p>\n

This is a possible intermediate-mass black hole<\/a> (IMBH), a long-sought class of black hole that seems to evade detection by even our most powerful telescopes.<\/p>\n

\"ImageImage showing a possible rare object known as an intermediate-mass black hole (IMBH), a rare class of black holes. Called NGC 6099 HLX-1, it seems to reside in a compact star cluster in a giant elliptical galaxy. Credit: X-ray: NASA\/CXC\/Inst. of Astronomy, Taiwan\/Y-C Chang; Optical\/UV: NASA\/ESA\/STScI\/HST; Image Processing: NASA\/STScI\/J. DePasquale
\nWhat makes this black hole so special<\/p>\n

Black holes usually come in two types:<\/p>\n

Stellar black holes, which form from dying stars and weigh less than 100 times the mass of our Sun
\nSupermassive black holes, millions or billions of times more massive, lurking in the centres of galaxies<\/p>\n

Intermediate-mass black holes have remained tricky to spot.<\/p>\n

They\u2019re too big to form from single stars and too small to glow with the brightness of supermassive black holes.<\/p>\n

Scientists believe they play a key role in the growth of galaxies, but finding them remains a challenge.<\/p>\n

“X-ray sources with such extreme luminosity are rare outside galaxy nuclei and can serve as a key probe for identifying elusive IMBHs.” says study said lead author Yi-Chi Chang of the National Tsing Hua University, Hsinchu, Taiwan.<\/p>\n

“They represent a crucial missing link in black hole evolution between stellar mass and supermassive black holes.”<\/p>\n

\"ArtworkArtwork depicting a tidal disruption event (TDE). TDEs are causes when a star passes close to a supermassive black hole and get torn apart by the gravity of the latter. The debris forms a fan-shaped pattern around the black hole before eventually falling in.
\nCaught in the act of devouring a star<\/p>\n

Astronomers first spotted something strange in 2009: a bright source of X-rays picked up by the Chandra X-ray Observatory.<\/p>\n

Over the next decade, it flared up dramatically in 2012 \u2013 becoming 100 times brighter \u2013 before slowly dimming again by 2023.<\/p>\n

That kind of behaviour points to a dramatic event: a black hole tearing apart a star, an explosive occurrence known as a tidal disruption event.<\/p>\n

The shredded star forms a hot, glowing disk of gas spiralling into the black hole, and that’s when telescopes can finally catch it.<\/p>\n

Video animation of a tidal disruption event, when a star is torn apart by a black hole. Animation: NASA, ESA, STScI, Ralf Crawford (STScI)<\/p>\n

X-rays from NGC 6099 HLX-1 indicate a temperature of 3 million degrees, which is consistent with a tidal disruption event.<\/p>\n

And the Hubble Space Telescope found evidence for a small cluster of stars around the black hole.<\/p>\n

This seems to fit the picture, as the star cluster would give the black hole plenty to feast on. The stars are so close together they’re just a few lightmonths apart (about 500 billion miles).<\/p>\n

“If the IMBH is eating a star, how long does it take to swallow its gas? In 2009, HLX-1 was fairly bright. Then in 2012, it was about 100 times brighter. And then it went down again,” says study co-author Roberto Soria of the Italian National Institute of Astrophysics.<\/p>\n

“So now we need to wait and see if it\u2019s flaring multiple times, or there was a beginning, there was peak, and now it’s just going to go down all the way until it disappears.”<\/p>\n

\"ImageImage showing a possible rare object known as an intermediate-mass black hole (IMBH), a rare class of black holes. Called NGC 6099 HLX-1, it seems to reside in a compact star cluster in a giant elliptical galaxy. Credit: X-ray: NASA\/CXC\/Inst. of Astronomy, Taiwan\/Y-C Chang; Optical\/UV: NASA\/ESA\/STScI\/HST; Image Processing: NASA\/STScI\/J. DePasquale
\nThe building blocks of giant black holes<\/p>\n

Discoveries like this help scientists understand how black holes \u2013 and the galaxies around them \u2013 grow and evolve over time.<\/p>\n

One leading theory suggests that small IMBHs slowly merge together, eventually forming the supermassive black holes seen at the hearts of most galaxies.<\/p>\n

Another theory suggests they form directly from collapsing gas clouds in the early Universe.<\/p>\n

And this discovery hints that galaxies could be hiding satellite black holes in their outer regions, orbiting far from the centres where supermassive black holes usually live.<\/p>\n

“If we are lucky, we’re going to find more free-floating black holes suddenly becoming X-ray bright because of a tidal disruption event,” says Soria.<\/p>\n

“If we can do a statistical study, this will tell us how many of these IMBHs there are, how often they disrupt a star, how bigger galaxies have grown by assembling smaller galaxies.”<\/p>\n","protected":false},"excerpt":{"rendered":"Astronomers using NASA\u2019s Hubble Space Telescope and Chandra X-ray Observatory have discovered a possible ‘missing link’ black hole,…\n","protected":false},"author":2,"featured_media":22950,"comment_status":"","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[23],"tags":[64,63,128,285],"class_list":["post-22949","post","type-post","status-publish","format-standard","has-post-thumbnail","category-space","tag-au","tag-australia","tag-science","tag-space"],"_links":{"self":[{"href":"https:\/\/www.newsbeep.com\/au\/wp-json\/wp\/v2\/posts\/22949","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.newsbeep.com\/au\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.newsbeep.com\/au\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.newsbeep.com\/au\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/www.newsbeep.com\/au\/wp-json\/wp\/v2\/comments?post=22949"}],"version-history":[{"count":0,"href":"https:\/\/www.newsbeep.com\/au\/wp-json\/wp\/v2\/posts\/22949\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.newsbeep.com\/au\/wp-json\/wp\/v2\/media\/22950"}],"wp:attachment":[{"href":"https:\/\/www.newsbeep.com\/au\/wp-json\/wp\/v2\/media?parent=22949"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.newsbeep.com\/au\/wp-json\/wp\/v2\/categories?post=22949"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.newsbeep.com\/au\/wp-json\/wp\/v2\/tags?post=22949"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}