A telescope observes tens of thousands of stellar nursery galaxies


The European “Louvre” radio telescope has revealed unprecedented resolution images of tens of thousands of galaxies that form stars in the so-called “young” universe.

This is the second time, data are available from this network, which includes about 70 thousand antennas distributed in ten European countries, which detect particles moving at a speed close to the speed of light, accelerated by events such as star explosions, collision of galaxy clusters, or the activity of black holes, and form stars (or stellar nursery galaxies). ).

“The scientific basis for the project is to study the formation of galaxies and the work of black holes in their midst,” explained astronomer at the Paris Observatory, Cyril Tass.

Tass participated in the preparation of 14 studies based on the “Louvre” data set, which were published on Wednesday in a special issue of “Astronomy and Astrophysics” magazine.

The telescope focused on a wide field of the northern sky, with an exposure time ten times longer than that which allowed it to create its first cosmic map in 2019.

Tass explained, “This provides more accurate results, such as a picture taken in the dark, as the longer the exposure period, the more difficult to see” objects can be distinguished.

“We are witnessing a peak in star formation and black hole activity” in young galaxies, about 3 billion years after the Big Bang, likening that to “fireworks.”

And “Louvre” detected that indirectly, through cosmic radiation – the energy released by the galaxy – that is accelerated by supernovae, that is, stars that explode when they die.

The astronomer said, “When the galaxy forms stars, many stars explode at the same time, which accelerates the particles of very high energy, and galaxies begin to radiate” in this range of radio waves that “Louvre” observed.

It is assumed that this data, along with those collected by other means to observe the sky – visually or in the X-ray and infrared ranges – should allow a better understanding of the evolution of the universe, pending the launch of new wireless means that allow obtaining information about the early stages of the universe.


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