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L I V E N U D E A S T R O N O M Y
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August 29, 2008
Subject: Clash Of Clusters Provides New Dark Matter Clue
> http://www.sciencedaily.com/releases/2008/08/080827104704.htm
>
> ScienceDaily - New Hubble and Chandra observations of the
> galaxy cluster known as MACSJ0025.4-1222 indicate that a titanic
> collision has separated dark from ordinary matter. This provides
> independent confirmation of a similar effect detected previously
> in a target dubbed the Bullet Cluster, showing that the Bullet
> Cluster is not an anomalous case.
>
> MACSJ0025 formed after an enormously energetic collision
> between two large clusters. Using visible-light images from
> Hubble, astronomers were able to infer the total mass
> distribution - dark and ordinary matter. Hubble was used to
> map the dark matter (coloured in blue) using a technique known
> as gravitational lensing.
>
> Chandra data enabled the astronomers to accurately map the
> ordinary matter, mostly in the form of hot gas, which glows
> brightly in X-rays (shown in pink).
>
> As the two clusters that formed MACSJ0025 (each almost a
> whopping quadrillion times the mass of our Sun) merged at
> speeds of millions of kilometres per hour, hot gas in the two
> clusters collided and slowed down, but the dark matter passed
> right through this smash-up. The separation between material
> shown in pink and blue therefore provides observational evidence
> for dark matter and sup****ts the view that dark matter particles
> interact with each other only very weakly or not at all, apart from
> the pull of gravity.
>
> The international team of astronomers in this study was led by
> Marusa Bradac of the University of California, Santa Barbara, USA,
> and Steve Allen of the Kavli Institute for Particle Astrophysics and
> Cosmology at Stanford University and the Stanford Linear
> Accelerator Center (SLAC), USA. Their results will appear in an
> upcoming issue of The Astrophysical Journal.
>
> Adapted from materials provided by European Space Agency.
>
> http://news.yahoo.com/s/nm/galaxies_collision_dc
That news was 212 degrees--*BOILING HOT* !...
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I L O V E T H I S U N I V E R S E
happy days and...
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--
Indelibly yours,
Paine Ellsworth
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