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Focus: Radio Signals May Reveal Cosmological Structure

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  Focus: Radio Signals May Reveal Cosmological Structure Sam Wormley <swormley1@gmail.com> - 2015-09-18 16:18 -0500
    Re: Focus: Radio Signals May Reveal Cosmological Structure jimp@specsol.spam.sux.com - 2015-09-18 21:49 +0000
      Re: Focus: Radio Signals May Reveal Cosmological Structure Sam Wormley <swormley1@gmail.com> - 2015-09-18 17:55 -0500
        Re: Focus: Radio Signals May Reveal Cosmological Structure jimp@specsol.spam.sux.com - 2015-09-18 23:15 +0000

#521878 — Focus: Radio Signals May Reveal Cosmological Structure

Focus: Radio Signals May Reveal Cosmological Structure
> http://physics.aps.org/articles/v8/90


> A basic goal of observational cosmology is mapping the
> three-dimensional distribution of matter in the Universe. Such
> efforts require accurate estimates of distances to faint, faraway
> galaxies, a task that has always been difficult. Two cosmologists now
> propose an entirely new way to gauge large-scale cosmological
> structure. The technique involves analyzing brief bursts of radio
> waves from a recently discovered class of astronomical objects—the
> further these signals travel, the greater the distortions that appear
> in them. The feasibility of the method depends, however, on as-yet
> unknown properties of the emission sources.
>
> Comparison of the observed large-scale structure of the Universe to
> theoretical predictions is an important test of cosmological
> theories, but astronomers have few ways to estimate cosmological
> distances. They can measure the brightness of an object with a known
> intrinsic luminosity or measure the redshift of the object's
> spectrum, but both of these methods suffer from uncertainties or
> systematic biases. A new method to estimate large-scale structure
> potentially offers an independent perspective on an issue of
> fundamental significance.
>
> In 2007, astronomers detected a burst of broadband radio emission
> lasting only a few milliseconds [1]. They found that the burst's
> longer wavelengths arrived later than the shorter wavelengths, the
> time lag being proportional to the square of the wavelength. This
> delay is characteristic of “dispersion” in the speed of
> electromagnetic radiation traveling through a charged plasma, such as
> the exceedingly sparse free electrons that fill intergalactic space.
> According to this explanation, the source of the burst was extremely
> bright and at a distance of almost 1000 megaparsecs (Mpc), or 3
> billion light years, the astronomers found.
>


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#521888

Sam Wormley <swormley1@gmail.com> wrote:

That's twice for the same breathless press release, shit head?

Do you even read them before cut and pasting them, shit head?

Do you remember what you did just a few minutes ago, shit head?


-- 
Jim Pennino

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#521907

On 9/18/15 4:49 PM, jimp@specsol.spam.sux.com wrote:
> Sam Wormley <swormley1@gmail.com> wrote:
>
> That's twice for the same breathless press release, shit head?
>
> Do you even read them before cut and pasting them, shit head?
>
> Do you remember what you did just a few minutes ago, shit head?
>
>

   I went for a pee -- How about you, jimp.


-- 

sci.physics is an unmoderated newsgroup dedicated
to the discussion of physics, news from the physics
community, and physics-related social issues.

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#521915

Sam Wormley <swormley1@gmail.com> wrote:
> On 9/18/15 4:49 PM, jimp@specsol.spam.sux.com wrote:
>> Sam Wormley <swormley1@gmail.com> wrote:
>>
>> That's twice for the same breathless press release, shit head?
>>
>> Do you even read them before cut and pasting them, shit head?
>>
>> Do you remember what you did just a few minutes ago, shit head?
>>
>>
> 
>   I went for a pee -- How about you, jimp.
 
I took a large Sam Wormley and had to flush three times, shit head. 

-- 
Jim Pennino

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