“This map shows structures in which are hidden the imprint of the early Universe and the entire history of its expansion”

It was only seven months since Desi, an instrument that scans our skies from US soil, began its observation mission. And it is already delivering today the largest and most detailed map of the Universe ever produced. While waiting to provide astronomers with material to study, in particular, the history of our Universe.

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[EN VIDÉO] The 3D map of the history of the Universe
One of the most important advances of the last decade in terms of cosmological observation: the most complete 3D map of the universe ever!

It is in 2019 that the eyes of the Desi instrument – for Dark Energy Spectrocopic Instrument, understand, spectroscopic instrument for thedark energy – opened for the first time on our Universe. On the side of the Kitt Peak National Observatory (United States). But validation phase and health crisis have been there. And it was not until last May that he really began to scrutinize the cosmos. So only seven months ago. However, he has already recorded data in quantity … astronomical! Across more than 7.5 million galaxies and quasars. Enough to build the largest and most detailed map of the Universe ever produced. While theinstrument Desi has not yet accomplished more than 10% of its five-year mission …

“This card is of great beauty, comments Julien Guy, researcher at Berkeley Lab, in one communicated. It shows huge clusters, filaments and voids. The largest structures in the Universe. Structures in which are hidden the imprint of the primitive Universe and the whole history of its expansion ”.

Remember that the more the spectre from light that comes to us from a galaxy is redshifted, the further that galaxy moves away from us. Thanks to the spectrographs attached to it, it is therefore these red shifts which open to Desi the doors from the depth of our Universe. And reveal clusters and galaxy supermasters which, billions of years later, still bear traces of the past. From that time when they were only waves ripples in the primordial plasma of our Universe.

The future of our universe and crucial information on exotic objects

A unique chance for astronomers to understand what future awaits our Universe. To understand what role what they call dark energy plays in its expansion. Because for that, you have to understand its history. How dark energy could have behaved in the past. And it is very precisely for this purpose that Desi was developed.

But we will probably have to wait until the end of Desi’s mission to obtain these answers. In the meantime, the instrument could provide astronomers with some keys to understanding other questions. That of black holes from mass intermediate, for example. A black hole can indeed be very difficult to find. Unless he attracts enough matter. And then forms an active galactic nucleus. In the largest of galaxies, this nucleus can be among the brightest objects in our skies. But in the smallest, it remains difficult to distinguish from a star. But Desi should achieve it.

The instrument should also make it possible to better understand theevolution of quasars. The brightest objects in our Universe. Researchers believe they are first surrounded by an envelope of dust. And that the light they emit makes her blush. As they age, they may well shed this dust and become bluer. By reporting data on nearly 2.5 million quasars, Desi could shed light on this theory. “This instrument is really great, rejoices Victoria Fawcett, astronomer at the University of Durham (United Kingdom). Beyond the quasars, it allows us to observe objects much weaker and redder than before. Systems exotic that we had never had the opportunity to study ”.

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