Tuesday , May 18 2021

Finally a picture of black holes? Reply on Wednesday



Illustrative image: universitam.com

– Will we finally see the black hole? The international collaboration of the telescope and observatory Telescope del Horizonte de Ecesos (EHT), which seeks to capture the first image of one of these "monsters" from the universe, announces & # 39; no precedent result & # 39; for next Wednesday.

The mystery is complete about what will be revealed, but mobilization is exceptional: Six major press conferences will be held simultaneously in the world: in Belgium (Brussels), Chile (Santiago), China (Shanghai), Japan (Tokyo ), Taipei (Taiwan), and the United States (Washington) & quot; says the European Southern Observatory (ESO).

In April 2017 eight telescopes in different parts of the world simultaneously pointed to two black holes: Sagittarius A * at the center of the Milky Way and his congener in the center of the M87 galaxy. Objective: Try to get the picture.

For although the eighteenth century has been talking about black holes, no telescope has yet allowed one to "see" one.

"We really think there is a black hole in the universe, though we have never seen it before," said Paul McNamara, European Space Agency (ESA) LISA Pathfinder, a future space observatory.

Black holes are celestial bodies that have very important mass in very small volume. It was like the Sun was only 6 kilometers in diameter or the Earth was squeezed up to the size of the sun.

They are so massive that nothing disappears, neither matter nor light, regardless of their wavelength. The other side of the coin is that they are invisible.

But advances. "The major new moves were at the beginning of the observation," he recalled last month to British astrophysicist Martin Rees, a former partner of Stephen Hawking from Cambridge University.

Teleskop Event Horizon (EHT), by creating a virtual Earth-based telescope, about 10,000 kilometers in diameter, is well illustrated by progress in radio astronomy. With the undeniable interest, because the larger the telescope, the more details you can see.

"Instead of building a huge telescope (which would risk sinking under its own weight), several observatories are combined as small fragments of a large mirror," explained Michael Bremer, astronomer from the Institute of Radioastronomy, in 2017. Millimeter (IRAM) and responsible for EHT observations in European telescopes.

With the IRAM telescope in Sierra Nevada (Spain), the powerful ALMA radio telescope in Chile and the structures in Hawaii (United States) and Antarctica, the Event Horizon Telescope covers a large part of the planet.

With this multiple observation, astronomers seek to identify the immediate environment of the black hole. According to theory, when matter absorbs a monster, it emits light. The EHT project, capable of capturing the millimeter waves emitted by the black hollow environment, aimed at defining the contours of the celestial body, the so-called horizon of events.

Archer A *, the first of two project goals, has 26,000 light years from Earth. Its mass is equivalent to four million times the sun.

Its congenial galaxy M87 is "one of the most famous black holes more massive, 6,000 million times our Sun and 1,500 times more than Sgr A *," says EHT. There are 50 million light years from Earth near the cosmic scale, but 2000 times further than Sgr A *, he adds.


Source link