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Old 10-17-2010   #1
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800 trillion suns

http://www.sciencedaily.com/releases...1013122559.htm

ScienceDaily (Oct. 14, 2010) — Astronomers using the South Pole Telescope report that they have discovered the most massive galaxy cluster yet seen at a distance of 7 billion light-years. The cluster (designated SPT-CL J0546-5345) weighs in at around 800 trillion Suns, and holds hundreds of galaxies.

"This galaxy cluster wins the heavyweight title. It's among the most massive clusters ever found at this distance," said Mark Brodwin, a Smithsonian astronomer at the Harvard-Smithsonian Center for Astrophysics. Brodwin is first author on the paper announcing the discovery, which appeared in the Astrophysical Journal.

Redshift measures how light from a distant object has been stretched by the universe's expansion. Located in the southern constellation Pictor (the Painter), the cluster has a redshift of z=1.07. This puts it at a distance of about 7 billion light-years, meaning we see it as it appeared 7 billion years ago, when the universe was half as old as now and our solar system didn't exist yet.

Even at that young age, the cluster was almost as massive as the nearby Coma cluster. Since then, it should have grown about four times larger. If we could see it as it appears today, it would be one of the most massive galaxy clusters in the universe.

"This cluster is full of 'old' galaxies, meaning that it had to come together very early in the universe's history -- within the first two billion years," stated Brodwin.

Galaxy clusters like this can be used to study how dark matter and dark energy influenced the growth of cosmic structures. Long ago, the universe was smaller and more compact, so gravity had a greater influence. It was easier for galaxy clusters to grow, especially in areas that already were denser than their surroundings.

"You could say that the rich get richer, and the dense get denser," quipped Harvard astronomer Robert Kirshner, commenting on the study.

...continued at link....

...
An infrared/optical representative-color image of a massive galaxy cluster located 7 billion light-years from Earth. This cluster weighs as much as 800 trillion Suns. Galaxies with "old" stellar populations, like modern-day ellipticals, are circled in yellow; galaxies with "young" stellar populations, like modern-day spirals, are circled in blue.
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Old 10-17-2010   #2
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Re: 800 trillion suns

Coolness! And to think that those elliptical galaxies, in all probability, contain red dwarf stars which have not altered in temperature or solar flux for billions of years longer than our own sun has been around - and are still shining now on planets which might be homes to races older than our entire solar system.
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Old 10-18-2010   #3
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Re: 800 trillion suns

^Like the race of the Harbinger of Stellar Prophecy! Haha. This is awesome!
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