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FRAME > BLACK HOLE

Arshake by Arshake
14/04/2019
in Frame
FRAME > BLACK HOLE

The Event Horizon Telescope (EHT) — a planet-scale array of eight ground-based radio telescopes forged through international collaboration — was designed to capture images of a black hole. In coordinated press conferences across the globe, EHT researchers revealed that they succeeded, unveiling the first direct visual evidence of the supermassive black hole in the centre of Messier 87 and its shadow. The shadow of a black hole seen here is the closest we can come to an image of the black hole itself, a completely dark object from which light cannot escape. The black hole’s boundary — the event horizon from which the EHT takes its name — is around 2.5 times smaller than the shadow it casts and measures just under 40 billion km across. While this may sound large, this ring is only about 40 microarcseconds across — equivalent to measuring the length of a credit card on the surface of the Moon. Although the telescopes making up the EHT are not physically connected, they are able to synchronize their recorded data with atomic clocks — hydrogen masers — which precisely time their observations. These observations were collected at a wavelength of 1.3 mm during a 2017 global campaign. Each telescope of the EHT produced enormous amounts of data – roughly 350 terabytes per day – which was stored on high-performance helium-filled hard drives. These data were flown to highly specialised supercomputers — known as correlators — at the Max Planck Institute for Radio Astronomy and MIT Haystack Observatory to be combined. They were then painstakingly converted into an image using novel computational tools developed by the collaboration.

FRAME ferma la memoria di questo momento storico: la rivelazione dell’immagine di un buco nero, in questo caso al centro della galassia M87, distante da noi 55 milioni di anni luce. Alla memoria di questa immagine, che documenta e conferma ulteriormente la teoria della relatività di Einstein e che restituisce fisicità all’orizzonte degli eventi, vorremmo associare quella della modalità con cui si forma questo tipo di immagine, nella comunicazione dei media spesso definita con il termine di ‘scatto’. Si tratta, infatti, del risultato della combinazione di dati e di fonti diverse derivate da una serie di antenne del network EHT che catturano le frequenze spaziali e le traducono in pixel in processi che elaborano simultaneamente  dati da diverse fonti e che durano anni, in questo caso circa sei.


Credit: Black Hole captured by EHT – Event Horizon Telescope collaboration

 

 

Tags: arsarshakeblack holebuco nerodata visualisingEHT - Event Horizon Telescopeframeimage
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