December 4, 2022


Astronomers see gigantic collisions of galaxy clusters in young universe

Astronomers see gigantic collisions of galaxy clusters in young universe
Astronomers see gigantic collisions of galaxy clusters in young universe
Graphic of a distant cluster of galaxies (PSZ2 G091.83+26.11) at 7 billion light-weight many years from Earth. The most yellowish-white places are complete galaxies, some spots are foreground stars. The X-rays (blue) stem from fuel of about 10 million to 100 million degrees hot. The radio waves (purple) originate from particles that have been accelerated to nearly the speed of light. Credit score: PanSTARRS/NASA/ Chandra/LOFAR

An international workforce of researchers led by Leiden University (the Netherlands) has mapped nine gigantic collisions of galaxy clusters. The collisions took location seven billion many years in the past and could be observed because they speed up particles to large speeds. It is the initially time that collisions of this kind of distant clusters have been examined. The scientists publish their results in the journal Mother nature Astronomy on Monday evening 2 November.

Galaxy clusters are the largest structures in the Universe. They can consist of 1000’s of galaxies, every with billions of stars. When these kinds of clusters merge, the electrons between them are accelerated to almost the velocity of light. The accelerated particles emit radio waves when they appear into speak to with magnetic fields in the clusters.

Till now, telescopes had been not highly effective ample to acquire radio waves from distant colliding clusters. But many thanks to the Dutch-European network of linked LOFAR antennas and an ‘exposure time’ of eight hrs for every cluster, the scientists have been able to acquire in depth knowledge from distant clusters for the initial time.

The info present, amongst other issues, that the radio emission from distant colliding clusters is brighter than earlier envisioned. According to prevailing theories, cluster radio emission originates from electrons that are accelerated by the turbulent motions. Investigation chief Gabriella Di Gennaro, Ph.D. applicant at Leiden University (the Netherlands) provides, “We hence assume that the turbulence and vortices prompted by the collisions are potent enough to accelerate particles also in a young Universe.”

Furthermore, the magnetic fields in the distant clusters turned out to be about as potent as in formerly investigated close by clusters. According to co-writer and magnetic area skilled Gianfranco Brunetti (INAF-Bologna, Italy), this was surprising: “We do not nevertheless know how these magnetic fields can be so powerful in a however youthful Universe, still our study provides vital constraints on their origin. We expect that potential observations of distant clusters will provide more perception.”

The beautiful mess in Abell 2255

Far more details:
Quickly magnetic discipline amplification in distant galaxy clusters, Nature Astronomy (2020). DOI: 10.1038/s41550-020-01244-5 , www.mother

Offered by
Netherlands Study University for Astronomy

Astronomers see gigantic collisions of galaxy clusters in youthful universe (2020, November 2)
retrieved 4 November 2020

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