Файл:Black hole - Messier 87.jpg
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| Описание | 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. In this image of M87* taken on 11 April 2017 (a representative example of the images collected in a global 2017 EHT campaign), the shadow of a black hole 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 in the 2017 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. This image is the average of three different imaging methods after convolving each with a circular Gaussian kernel to give matched resolutions. The image is shown in units of brightness temperature, <img alt="{\displaystyle {T}_{\rm {b |
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=S{\lambda }^{2}/2{k}_{\rm {B}}{\rm {\Omega }}}" aria-hidden="true" class="mwe-math-fallback-image-inline mw-invert" src="https://wikimedia.org/api/rest_v1/media/math/render/svg/068e6ad38b6ee20805c1fd176a68343c8bd005f9" style="vertical-align: -0.838ex; width:16.121ex; height:3.176ex;"/>, where S is the flux density, λ is the observing wavelength, <img alt="{\displaystyle {k}_{\rm {B}}}" aria-hidden="true" class="mwe-math-fallback-image-inline mw-invert" src="https://wikimedia.org/api/rest_v1/media/math/render/svg/fc7fadc2641881cbfa453ef6b7ce7db5e7f15e7b" style="vertical-align: -0.671ex; width:2.607ex; height:2.509ex;"/> is the Boltzmann constant, and Ω is the solid angle of the resolution element.
| источник = https://www.eso.org/public/images/eso1907a/; JPG saved from full size TIFF and converted with maximum quality level 12 in Photoshop 2019.
| время создания = circa April 2017
; released 10 April 2019
| автор = Event Horizon Telescope — Лицензия: CC BY 4.0 (Creative Commons Attribution 4.0) https://creativecommons.org/licenses/by/4.0 }} Источник файла — сайт Wikimedia Commons, куда он был загружен под одной из свободных лицензий ( https://commons.wikimedia.org/wiki/File:Black_hole_-_Messier_87.jpg ). Авторов, работавших над этим файлом см. в истории файла: https://commons.wikimedia.org/w/index.php?title=File:Black_hole_-_Messier_87.jpg&action=history
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| текущий | 16:20, 3 октября 2023 | | 5932 × 3456 (144 КБ) | I, Robot (обсуждение | вклад) | == Описание == {{Изображение | описание = The [https://en.wikipedia.org/wiki/Event_Horizon_Telescope 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 [https://en.wikipedia.org/wiki/black_hole 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... |
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