Discovered the most massive cluster of galaxies at a distance of 7 billion light-years away


15/10/2010

With the help of the South Pole Telescope, astronomers have discovered the most massive galaxy cluster ever discovered by man, at a distance of 7 billion light-years away from us. Cluster, called SPT-CL J0546-5345, weighs as much as 800 trillion Suns, and consists of hundreds of galaxies.

"This cluster is rightly bears the title of champion in the heavyweight division. This is one of the most massive clusters ever found at this distance," - said Mark Brodvin, of the Harvard-Smithsonian Center for Astrophysics. Brodvin is the author of the article about the discovery, which was published in the Astrophysical Journal.

The gravitational redshift allows you to determine how much power alienated by the expansion of the universe. This cluster, which lies in the southern constellation Pictoris (Latin Pictor), has a redshift of z = 1.07. This means that the distance to it is 7 billion light years, so it appeared 7 billion years ago, when the universe was half younger and our solar system did not exist.

Even from an early age, in which we see it now, this cluster is not as big as the neighboring accumulation Coma. Nowadays, it has increased its weight in four times the original size. If we had seen it the way it is today, not with a delay of 7 billion years, you would see one of the most massive clusters in the universe.

"This cluster contains a lot of ’old’ galaxies, which means it was formed very early in the universe’s history - within the first two billion years" - said Brodvin.

Galaxy clusters like this can be used to study the effects of dark matter and dark energy on cosmic structure. Long ago, when the universe was smaller and more compact, gravity has a greater effect. Galaxies easier to grow, especially in those places where there was a high density compared to the surrounding space.

"You could say that the rich are getting richer and the dense becomes even tighter," - said Harvard astronomer Robert Kirshner.

With the expansion of the universe with ever-increasing rate due to dark energy, it is becoming increasingly fragmented. Dark energy dominates over the force of gravity and does not form new clusters of galaxies.

"After so many years of effort, the kind of success is extremely encouraging. Upon completion of this study, which will last until the next year, we will discover even more of the most massive clusters in the early universe," - said Brodvin. All the details about the main events of the day widgets news let us know.


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