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Re: Quasars Vs The Big Bang

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Posted by yanniru/">yanniru on June 3, 1999 13:22:37 UTC

: There is a slight problem in understanding the structure of the universe. : The light we see from quasars is the quasars' past but the present here.But the big bang is as much in the past as the quasars presents(that we see today as their pasts) have travelled. And quasars are found in all directions. They are strong gamma ray sources. : Now if we recieve gamma rays from quasars, why is the echo of the big bang so red shifted as to be reduced to microwaves ?

R.T: The problem is resolved by the realization the the light of the Big Bang was finally released when the universe had cooled to 3,000 K. This is cooler than our own sun. So the first light was visible but with an average wavelength that was already 1/2 what we see from our sun. Quasers are extremely hot in comparison and they emit gamma rays, not visible light. The first light was shifted since its emission 300,000 years after the Big Bang until now by a factor of a thousand, sice its equivalent temperature went from 3000 K to 3 K. So the gamma rays from quasars must be shifted in wavelength or frequency by less than a factor of 1000. A typical quasar has a frequency shitft of 100. So if the quasar is emitting very intense gamma rays to begin with, it's likely that we see them as gamma rays evenn after a factor of 100 shift in frequency. My question is, what do we measure to estimate the shift? We need the shift, I believe, to know how far away the quasar is, but we do not as far as I know, know the emission spectrum.

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