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Observable Relativistic Effects in Astronomy?
According to the HyperPhysics site, super novae are detectable out to
8 billion light years. And according to Hubell, super novae at that distance should have a velocity relative to earth of 0.6c. This would result in a relativistic time dilation factor of 1.25. Consequently, the average of luminosity curves of super novae at 8 billion light years should be stretched out by 25% as a result of relativistic time dilation, when compared to closer super novae. Is there any data demonstrating this? Also, is there any detectable difference in doppler shifting of light from the receding arms versus the advancing arms of galaxies at 8 billion light years distance? If so, is there any difference in the mean rotational velocity of a large sample of galaxies at 8 billion lys and above, versus, a large sample of 1 billion 2yrs and below? Thanks, Pat |
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Observable Relativistic Effects in Astronomy?
"Pat Dolan" wrote in message om... According to the HyperPhysics site, super novae are detectable out to 8 billion light years. And according to Hubell, super novae at that distance should have a velocity relative to earth of 0.6c. This would result in a relativistic time dilation factor of 1.25. Consequently, the average of luminosity curves of super novae at 8 billion light years should be stretched out by 25% as a result of relativistic time dilation, when compared to closer super novae. Is there any data demonstrating this? I believe the light curve "stretching" is one of the factors used to help determine distance to a galaxy -- one of the reasons why amateur observation of extragalactic supernovae (and the subsequent establishment of said supernovae's light curves) is so valuable these days. Also, is there any detectable difference in doppler shifting of light from the receding arms versus the advancing arms of galaxies at 8 billion light years distance? If so, is there any difference in the mean rotational velocity of a large sample of galaxies at 8 billion lys and above, versus, a large sample of 1 billion 2yrs and below? I'm not sure about rotational differences between galaxies at 8 billion ly and those closer, but there is certainly a detectable doppler gradient across rotating galaxies. this gradient can be used to determine the tilt of the galaxy relative to our line-of-sight. whether any of these effects can be detected directly by a single amateur observer would depend on your equipment and your skill, I'd say. |
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