| 词条 | Event Horizon Telescope |
| 释义 |
The Event Horizon Telescope (EHT) is a project to create a large telescope array consisting of a global network of radio telescopes and combining data from several very-long-baseline interferometry (VLBI) stations around the Earth. The aim is to observe the immediate environment of the supermassive black hole Sagittarius A* at the center of the Milky Way, as well as the even larger black hole in the supergiant elliptical galaxy Messier 87, with angular resolution comparable to the black hole's event horizon.[1][2][3][4][5] OverviewThe EHT is composed of many radio observatories or radio telescope facilities around the world to produce a high-sensitivity, high-angular-resolution telescope. Through the technique of very-long-baseline interferometry (VLBI), many independent radio antennae separated by hundreds or thousands of miles can be used in concert to create a virtual telescope with an effective diameter of the entire planet.[6] The effort includes development and deployment of submillimeter dual polarization receivers, highly stable frequency standards to enable very-long-baseline interferometry at 230–450 GHz, higher-bandwidth VLBI backends and recorders, as well as commissioning of new submillimeter VLBI sites.[7] Each year since its first data capture in 2006, the EHT array has moved to add more observatories to its global network of radio telescopes. The first image of the Milky Way's supermassive black hole, Sagittarius A*, was expected to be produced in April 2017,[8][9] but owing to the South Pole Telescope being closed during winter (April to October) the data shipment delayed the processing to December 2017, when the shipment arrived.[10] The first image is now expected to be released on April 10, 2019.[11] The image will also test Albert Einstein's general theory of relativity at the extreme.[6][9] Data collected on hard drives are transported by airplane (a so-called sneakernet) from the various telescopes to the MIT Haystack Observatory in Massachusetts, USA, and the Max Planck Institute for Radio Astronomy, Bonn, Germany, where the data are cross-correlated and analyzed on a grid computer made from about 800 CPUs all connected through a {{nowrap|40 Gbit/s}} network.[12] Contributing institutionsSome contributing institutions are:[14] {{div col|colwidth=15em}}
References1. ^Viewing the Shadow of the Black Hole at the Galactic Center 2. ^Polarimetric Imaging of the Massive Black Hole at the Galactic Center 3. ^Main project website 4. ^{{cite news |last=Overbye |first=Dennis |authorlink=Dennis Overbye |title=Black Hole Hunters |url=https://www.nytimes.com/2015/06/09/science/black-hole-event-horizon-telescope.html |date=8 June 2015 |publisher=NASA |accessdate=8 June 2015 }} 5. ^{{Cite news |last1=Overbye |first1=Dennis |last2=Corum |first2=Jonathan |last3=Drakeford |first3=Jason |title=Video: Peering Into a Black Hole |url=https://www.nytimes.com/video/science/100000003725182/peering-into-a-black-hole.html |work=The New York Times |date=8 June 2015 |accessdate= 9 June 2015 |issn = 0362-4331}} 6. ^1 {{cite news |last=O'Neill |first=Ian |url=http://news.discovery.com/space/astronomy/event-horizon-telescope-will-probe-spacetimes-mysteries-150702.htm |title=Event Horizon Telescope Will Probe Spacetime's Mysteries |work=Discovery News |date=2 July 2015 |accessdate=2015-08-21 }} 7. ^MIT Haystack observatory 8. ^{{cite news |last=Webb |first=Jonathan |url=https://www.bbc.com/news/science-environment-35258378 |title=Event horizon snapshot due in 2017 |work=BBC News|date=8 January 2016 |accessdate=2016-03-24 }} 9. ^1 {{cite journal|title=How to hunt for a black hole with a telescope the size of Earth|author=Davide Castelvecchi|journal=Nature|volume=543|issue=7646|url=http://www.nature.com/news/how-to-hunt-for-a-black-hole-with-a-telescope-the-size-of-earth-1.21693|pages=478–480|doi=10.1038/543478a|pmid=28332538|date=23 March 2017|accessdate=30 March 2017|bibcode = 2017Natur.543..478C }} 10. ^{{Cite web|url=http://eventhorizontelescope.org/blog/eht-status-update-december-15-2017|title=EHT Status Update, December 15 2017|website=eventhorizontelescope.org|access-date=2018-02-09}} 11. ^{{cite news|title=The Wait is Almost Over. We’ll Finally See a Picture of a Black Hole’s Event Horizon on April 10th | author = Gough, Evan | date = April 3, 2019 | accessdate=April 5, 2019 | work = Universe Today | url = https://www.universetoday.com/141903/the-wait-is-almost-over-well-finally-see-a-picture-of-a-black-holes-event-horizon-on-april-10th/}} 12. ^{{cite news |last=Mearian |first=Lucas |url=http://www.computerworld.com/article/2972251/space-technology/massive-telescope-array-aims-for-black-hole-gets-gusher-of-data.html |title=Massive telescope array aims for black hole, gets gusher of data |work=Computerworld |date=18 August 2015 |accessdate=2015-08-21 }} 13. ^{{cite web|title=The Event Horizon Telescope and Global mm-VLBI Array on the Earth|url=https://www.eso.org/public/images/ann17015a/|publisher=European Southern Observatory|accessdate=31 March 2017}} 14. ^{{cite web |url=http://www.eventhorizontelescope.org/collaborators/index.html |publisher=Event Horizon Telescope |title=Collaborators |archive-url=https://web.archive.org/web/20170610173112/http://www.eventhorizontelescope.org/collaborators/index.html |archive-date=10 June 2017 |access-date=August 2015}} Further reading
External links
1 : Interferometric telescopes |
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