# Is there any velocity data for apparent superluminal jets?

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#### jeffreyH

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##### Is there any velocity data for apparent superluminal jets?
« on: 18/10/2015 02:43:41 »
I am looking for the observed velocities rather than the actual velocities. I know that the formula developed by Einstein for relativistic aberration is $$cos \theta_o\,=\,\frac{cos \theta_s - \frac{v}{c}}{1-\frac{v}{c} cos \theta_s}$$ and would like to test an alternative idea.

#### Bored chemist

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##### Re: Is there any velocity data for apparent superluminal jets?
« Reply #1 on: 18/10/2015 10:37:41 »
from
https://en.wikipedia.org/wiki/Superluminal_motion
"When first observed in the early 1970s, superluminal motion was taken to be a piece of evidence against quasars having cosmological distances. Although a few astrophysicists still argue in favor of this view, most believe that apparent velocities greater than the velocity of light are optical illusions "
So it's not a real velocity.
From the same page
"In 1993, Thomson et al. suggested that the (outer) jet of the quasar 3C 273 is nearly collinear to our line-of-sight. Superluminal motion of up to ~9.6c has been observed along the (inner) jet of this quasar.[3]"
Please disregard all previous signatures.

#### jeffreyH

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##### Re: Is there any velocity data for apparent superluminal jets?
« Reply #2 on: 18/10/2015 16:11:54 »
I know it is not a real velocity. I am interested in the data. You need to read more on this subject. Some jets are harder to explain.

#### jeffreyH

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##### Re: Is there any velocity data for apparent superluminal jets?
« Reply #3 on: 18/10/2015 17:15:10 »
OK. I am looking for the velocity beta data just to be clear.

#### jeffreyH

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##### Re: Is there any velocity data for apparent superluminal jets?
« Reply #4 on: 18/10/2015 23:20:28 »
I have found my data.