{"id":769,"date":"2019-04-10T13:07:49","date_gmt":"2019-04-10T13:07:49","guid":{"rendered":"http:\/\/horizon.peachpuff-wolverine-566518.hostingersite.com\/?p=769"},"modified":"2019-04-10T13:07:49","modified_gmt":"2019-04-10T13:07:49","slug":"astronomers-reveal-first-ever-image-of-a-black-hole","status":"publish","type":"post","link":"https:\/\/scienceblog.com\/horizon\/769\/astronomers-reveal-first-ever-image-of-a-black-hole\/","title":{"rendered":"Astronomers reveal first-ever image of a black hole"},"content":{"rendered":"

by\u00a0Jonathan O’Callaghan<\/em><\/p>\n

Scientists have revealed the first ever image of a black hole, a major milestone in astrophysics which not only backs up Einstein\u2019s theory of general relativity but also opens up a new era of black hole observations.<\/strong><\/h3>\n
\n
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The image shows the event horizon \u2013 the gravitational point of no return beyond which nothing, not even light, can escape \u2013 around the supermassive black hole in a nearby galaxy.<\/p>\n

It is the first time in history that such an image has been produced and was the result of a global collaboration of scientists working on the\u00a0Event Horizon Telescope<\/a>\u00a0(EHT) project.<\/p>\n

\u2018History books will be divided into the time before the image and after the image,\u2019 said Dr Michael Kramer from the Max Planck Institute for Radio Astronomy in Germany, one of the principal investigators on\u00a0BlackHoleCam<\/a>, the European contribution to the EHT. \u2018It is the first time that this has been possible, and it\u2019s been long in the making.\u2019<\/p>\n

Messier 87<\/strong><\/p>\n

The image shows the shadow of the event horizon around the supermassive black hole inside Messier 87 (M87), an elliptical galaxy located 53 million light-years from Earth. Seeing this event horizon is no mean feat; the black hole itself, while 6.5 billion times more massive than our Sun, is still incredibly small at this distance.<\/p>\n

That is one of the reasons such an image has never been taken before. No telescope alone possesses the observational power to observe the supermassive black holes believed to be at the centre of all galaxies. Instead, the EHT project combined the power of eight large radio telescopes around the world, from the South Pole to Spain, to create an Earth-sized virtual super telescope.<\/p>\n

\u2018We observed with (eight telescopes) simultaneously, so that as Earth rotates, there are three or four that are always pointing to the (black hole),\u2019 said Dr Luciano Rezzolla from Goethe University Frankfurt in Germany, another principal investigator on BlackHoleCam. \u2018We have collected (information) and built an image that we believe is consistent with what we would expect from a black hole.\u2019<\/p>\n

\n
\n

\u2018Of course we would have loved to prove Einstein wrong, but everything we see fits perfectly the prediction that is given by general relativity.\u2019<\/p>\n

Dr Heino Falcke, Radboud University Nijmegen, Netherlands<\/p><\/blockquote>\n<\/div>\n

Observations of the black hole at the heart of M87 were taken over a window of 10 days in April 2017, when fortuitously good weather allowed the telescopes to continuously observe the object. Using a technique called very-long-baseline interferometry (VLBI), the teams then combined the observations of the telescopes to give the final image.<\/p>\n

But so much data was collected \u2013 4 petabytes, or 4 million gigabytes \u2013 that it could not be digitally transferred. It had to be physically transported by sea and air before image processing could take place. It took the astronomers until summer 2018 to actually put the final image together.<\/p>\n

Relativity<\/strong><\/p>\n

The existence of black holes was first proposed following Albert Einstein\u2019s general theory of relativity in 1915. It was suggested that if an object\u2019s mass reached astonishingly high levels, it would collapse in on itself into a singularity, a point in space and time where gravity is so intense that the known laws of physics break down.<\/p>\n

Since then we have found indirect evidence for black holes. We have seen regions of super-heated material swirling around suspected black holes, known as quasars, and we have seen stars\u00a0orbiting the black hole<\/a>\u00a0believed to be at the centre of our own galaxy. We have also detected gravitational waves \u2013 ripples in space-time formed by two black holes merging. Never before, however, have we actually seen a black hole.<\/p>\n

And the image of M87\u2019s black hole matches our predictions for what it should look like. The shadow of the black hole is proof that its gravity is so intense that it is bending light itself, a prediction made thanks to general relativity. We can also see that the boundary between the interior and exterior of the black hole \u2013 the event horizon \u2013 actually exists, with a ring of photons of light surrounding it.<\/p>\n

\u2018Of course we would have loved to prove Einstein wrong, but everything we see fits perfectly the prediction that is given by general relativity,\u2019 said Dr Heino Falcke from Radboud University Nijmegen in the Netherlands, also a principal investigator on BlackHoleCam. \u2018It\u2019s confirmation that one of the most fundamental predictions (of general relativity) has passed the test.\u2019<\/p>\n

Sagittarius A*<\/strong><\/p>\n

While the researchers focused on M87 for this image, the overall EHT project also has plans to try and produce an image of the black hole at the Milky Way\u2019s galactic centre, called Sagittarius A*.<\/p>\n

Using the same VLBI method, the team has already taken observations of this object, and will hope to produce an image in the coming year or so. While it is considerably closer than M87\u2019s black hole at just 25,000 light-years away, it is also about 1,000 times smaller at 4 million solar masses, presenting its own unique challenges.<\/p>\n

\u2018At the same time we took data from M87 we also took data from our galactic centre,\u2019 said Dr Kramer. \u2018For now we have concentrated efforts on M87, and once that is out, we will focus all our attention on Sagittarius A*.\u2019<\/p>\n

The scientists are also hopeful that this discovery will usher in a new era of black hole observations. The technique they used pushed the limits of modern technology, but it proved it is very much possible. By combining multiple telescopes around the world, essentially turning Earth into one giant telescope, such fascinating objects in the universe become possible to see.<\/p>\n

The major limitation of this method is the size of Earth \u2013 we cannot build a virtual telescope on our planet larger than the planet itself. So if we want to observe black holes in other galaxies, we may have to use telescopes in space. Using three telescopes in Earth orbit, for example, it could be possible to see even more black holes in the coming decades.<\/p>\n

\u2018The only way to see more of these black holes is to have a telescope that\u2019s larger than Earth,\u2019 said Dr Falcke. \u2018And for that we need to go to space.\u2019<\/p>\n

How scientists turned Earth into a giant telescope<\/b><\/p>\n

Step 1<\/b>
\nAn Earth-sized telescope<\/b>
\n<\/b>
\nA global network of telescopes detected radio waves emitted in space. Thanks to the distance between their locations, the resolution was much higher than any one telescope could achieve alone. It was the equivalent of being able to stand in Lisbon and read a newspaper\u2019s fine print in Moscow.<\/p>\n

Step 2<\/b>
\nSychronised recording<\/b><\/p>\n

At a predetermined moment, all the telescopes recorded radio waves from the same region in the sky.<\/p>\n

Step 3<\/b>
\nCleaning up the noise<\/b><\/p>\n

A central processing facility gathered the data from the telescopes. It synchronised the different recordings using an atomic clock (above)\u00a0and eliminated the noise. Despite the high resolution, the data was not complete so computer algorithms were used to fill in the gaps.<\/p>\n

Step 4<\/b>
\nMatching the frequencies<\/b><\/p>\n

To create the image, scientists matched the radio wave frequencies from their observations to those coming from known elements in the universe that we can actually see.<\/p>\n

Step 5<\/b>
\nPainting by numbers<\/b><\/p>\n

Laying out the data on a virtual canvas, researchers essentially painted the image by numbers to produce the world\u2019s first ever picture of a black hole.<\/p>\n

Originally published on Horizon<\/a><\/i><\/p>\n<\/div>\n<\/div>\n<\/div>\n","protected":false},"excerpt":{"rendered":"

by\u00a0Jonathan O’Callaghan Scientists have revealed the first ever image of a black hole, a major milestone in astrophysics which not only backs up Einstein\u2019s theory of general relativity but also opens up a new era of black hole observations. The image shows the event horizon \u2013 the gravitational point of no return beyond which nothing, … Read more<\/a><\/p>\n","protected":false},"author":298,"featured_media":770,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"generate_page_header":"","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":[15,16],"tags":[243,25,79,24,35],"class_list":["post-769","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-space","category-technology","tag-black-hole","tag-innovation","tag-research","tag-science","tag-space"],"yoast_head":"\nAstronomers reveal first-ever image of a black hole - Horizon Magazine Blog<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/scienceblog.com\/horizon\/769\/astronomers-reveal-first-ever-image-of-a-black-hole\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Astronomers reveal first-ever image of a black hole\" \/>\n<meta property=\"og:description\" content=\"by\u00a0Jonathan O’Callaghan Scientists have revealed the first ever image of a black hole, a major milestone in astrophysics which not only backs up Einstein\u2019s theory of general relativity but also opens up a new era of black hole observations. 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