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calendar   Thursday - February 25, 2016

Dark Mass Found, Pope Exonerated

Does This FRB Make My Universe Look Fat?

Also: Anisotropic probing done to ionize Bary on intergalactic medium caused “redshift”



Radio telescope catches signal older than the Earth, realizes frequency anomalies are road map to missing “dark matter” that contains most of the mass of the universe.

For nearly a decade, astronomers have been puzzling over a certain type of signal. They’re called fast radio bursts, brief radio pulses that last only a few milliseconds, but give out as much energy as the sun will emit in 10,000 years.

To date, 18 of these vexing signals have been identified. Because they are so transient, all scientists had previously known about them was that they exist, and they’re really powerful.

Now researchers from Australia’s CSIRO and the National Astronomical Observatory of Japan’s Subaru telescope in Hawaii have for the first time calculated the originating location of a radio burst. The most recent of these signals, FRB 150418, was captured on the 18th of April in 2015.
...
Staggeringly, FRB 150418 came from an elliptical galaxy 6 billion light-years away.

What caused the FRB (or any FRB) is still unknown, but pinpointing the location of this burst indicates that they often occur from massive distances away. And it’s had another unexpected benefit: locating the universe’s missing matter.

The gravity in the universe is far greater than can be accounted for by what we observe. Astronomers believe that most of this is accounted for by dark energy, which makes up 70 percent of the universe, and dark matter, which makes up 25 percent of the universe. The remaining five percent is ordinary matter, and it’s what everything we see is made of.

But all the observed ordinary matter, from all the stars and galaxies and planets and nebulas, only adds up to about half of what should be there if this model of the universe is correct.

Using FRB 150418, the team was able to “locate” this missing matter. As radio waves travel through space, they run into gas and other material, which has an effect on the signal. By looking at delays in various radio frequencies, the team was able to calculate exactly how much material it had passed through on its 6 billion light-year journey.

The delay in the frequencies of the burst, visible as a spike, caused by matter between Earth and its origin.

“The good news is our observations and the model match—we have found the missing matter,” said lead author Evan Keane of the SKA Organisation. “It’s the first time a fast radio burst has been used to conduct a cosmological measurement.”

These signals are dispersed according to a precise physical law and this dispersion is a key observable quantity, which, in tandem with a redshift measurement, can be used for fundamental physical investigations10, 11. Every fast radio burst has a dispersion measurement, but none before now have had a redshift measurement, because of the difficulty in pinpointing their celestial coordinates. Here we report the discovery of a fast radio burst and the identification of a fading radio transient lasting ~6 days after the event, which we use to identify the host galaxy; we measure the galaxy’s redshift to be z = 0.492 ± 0.008. The dispersion measure and redshift, in combination, provide a direct measurement of the cosmic density of ionized baryons in the intergalactic medium of ΩIGM = 4.9 ± 1.3 per cent, in agreement with the expectation from the Wilkinson Microwave Anisotropy Probe

Since “paradigm” is pronounce para-dine, then “ΩIGM” must be “Omega Dyne”, right? Wasn’t that the cover corporation in Buckaroo Banzai for John Big Boo Tay? Or would Omega Dine be the actual name of the Restaurant at the End of the Universe? And if all of this theorizing and matter finding fits on the same intergalactic medium, just think what we’ll be able to pack onto next year’s intergalactic large!


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Posted by Drew458   United States  on 02/25/2016 at 04:46 PM   
Filed Under: • Science-TechnologySpace •  
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