Focus on the First Event Horizon Telescope Results
Shep Doeleman (EHT Director) on behalf of the EHT Collaboration
We report the first image of a black hole.
This Focus Issue shows ultra-high angular resolution images of radio emission from the supermassive black hole believed to lie at the heart of galaxy M87 (Figure 1). A defining feature of the images is an irregular but clear bright ring, whose size and shape agree closely with the expected lensed photon orbit of a 6.5 billion solar mass black hole. Soon after...
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. Today, in coordinated press conferences across the globe, EHT researchers reveal that they have succeeded, unveiling the first direct visual evidence of a supermassive black hole and its shadow.
This breakthrough was announced today in a series of six papers published in a special issue of The Astrophysical Journal Letters. The image reveals the black hole at the center of Messier 87 [1...
Cambridge, MA--A black hole four million times as massive as our Sun lurks at the center of the Milky Way. This black hole, called Sagittarius A* (Sgr A*), swallows nearby material that glows brightly as it approaches the event horizon. This galactic furnace is key to understanding black holes, but our view of it is obscured by lumpy clouds of electrons throughout the Galaxy. These clouds stretch, blur, and crinkle the image of Sgr A*, making it appear as though the black hole is blocked by an enormous sheet of frosted glass.
Predicted almost a century ago by Einstein’s Theory of General Relativity, black holes not only exist, but actually power some of the most extreme phenomena in the Universe. The Event Horizon Telescope (EHT) is a global effort to construct an Earth-sized virtual telescope array, able to actually “photograph” nearby supermassive black holes. It had its first full run in April 2017, and will announce results in 2019. Join EHT project director and project scientist (Doeleman, Psaltis), EHT science council astrophysicist (Markoff), and author/filmmaker (Galison) as they discuss the expected...
With every year that goes by, the total amount of knowledge that humanity accumulates only grows and grows. At the start of 2015, humanity had never detected a gravitational wave; at present, we've detected 11, and full expect to find perhaps hundreds more in 2019. In the early 1990s, we didn't know whether there were any planets outside our own Solar System; today, we have thousands, some of which are almost good enough to be considered Earth-like.
We've found all the particles in the Standard Model; we've discovered that the Universe is not only expanding,...
We live 26,000 light-years from the center of the Milky Way. That’s a rounding error by cosmological standards, but still — it’s far. When the light now reaching Earth from the galactic center first took flight, people were crossing the Bering Strait land bridge, hunting woolly mammoths along the way.
The distance hasn’t stopped astronomers from drawing a fairly accurate map of the heart of the galaxy. We know that if you travel inbound from Earth at the speed of light for about 20,000 years, you’ll encounter the galactic bulge, a peanut-shaped structure thick with stars, some...
"A wide-ranging array of radio dishes trained on the supermassive black hole at the center of our galaxy has revealed a glimpse of the magnetic field close to the Milky Way’s dark heart. The results could help explain why black holes, although not emitting any light themselves, are able to make the churning gas and dust around them shine with the brightness of thousands of stars."
Read More Science: http://www.sciencemag.org/news/2015/12/globe-spanning-telescope-array-glimpses-magnetic-field-around-milky-way-s-black-hole
ehtelescopeRadio interferometry is an art as well as science. This rendition of a supermassive black hole shrouded by gas, dust, stars and molecular clouds reveals some of the challenges associated with imaging black holes residing in the centers of galaxies.
Credit: NRAO/AUI/NSF t.co/PGRU7U5VJh
ehtelescopeA long exposure of the 12-meter antenna of the Greenland Telescope (GLT), situated 750 mi within the Arctic Circle. Since 2019, the GLT has been instrumental in enhancing the global coverage of the EHT.
You can read more about the GLT here:
Credit: M. Chen t.co/TQEVrsWYG1
ehtelescopeAn international team anchored by the Event Horizon Telescope (EHT) Collaboration has now imaged the heart of the nearby radio galaxy Centaurus A in unprecedented detail in a now released Nature Astronomy paper: Janssen et al. (EHTC) (2021) DOI: 10.1038/s41550-021-01417-w t.co/Ns0vH1BHBs
ehtelescopeAsk Us Anything: On Reddit this Friday 7/16/2021 from 11:30 AM-1 PM Eastern, EHT members Richard Anantua, Nick Conroy, Shep Doeleman, Charles Gammie, Kari Haworth, Sara Issaoun, Dom Pesce, Angelo Ricarte & Jonathan Weintraub will be answering questions on subreddit r/AskScience! t.co/Oi96Z5nlRR
ehtelescopeScientists use ~1 millimeter radio waves, which are beyond the scope of human eyesight, to peer through the blazing-hot cloud that surrounds black holes.
Credit: Chi-kwan Chan/University of Arizona. #space#innovationt.co/q4cfFYEVlJ
ehtelescopeAsk Us Anything: On Reddit this Friday 7/16/2021 from 11:30 AM-1:00 PM Eastern Time, EHT members Richard Anantua, Nick Conroy, Shep Doeleman, Charles Gammie, Kari Haworth, Sara Issaoun, Dom Pesce & Angelo Ricarte will be answering questions on the subreddit r/AskScience! t.co/sVDY75Rb8e