Left: A patch of sky about as big as the full moon where the MeerKAT telescope discerned the radio glow of about 200 galaxies. Only a few (circled) had been previously observed; Right: A distant galaxy with an explosive core powered by a black hole. Credit SKA South Africa
Astronomers from South Africa on Saturday revealed more than a thousand galaxies nobody knew existed. They were showing off the first taste of the ultimate cosmic feast of what is to come, at least as seen from this particular dusty crumb called Earth.
When it’s done, sometime around 2030, the Square Kilometer Array, as it is known, will be the largest telescope ever built on our planet. It will consist of thousands of radio antennas that will collectively cover a square kilometer (hence the name), spread out in mathematically intricate patterns in South Africa and Australia.
The telescope is being built by an international collaboration with its headquarters at the University of Manchester in England. The first phase, to be completed in 2023, will cost 650 million euros.
Astronomers estimate that it will pull some 35,000-DVDs-worth of data down from the sky every second. So much that it would take 2 million years to play on your smartphone.
For now the bounty consists of the radio glow of some 1,300 distant galaxies spotted in a patch of sky about 20 times the size of the full moon, where only 70 galaxies had been counted before. Some of them are erupting in cataclysms as massive black holes in their hearts spew radioactive high-energy particles across the dark sea of space.
They were recorded by a set of 16 antennas in an array called MeerKAT, which was built by South Africa. It will grow to 64 dishes and eventually be folded into the Square Kilometer Array.
Quelle: The New York Times