AFJ

2016-May-25, 06:52 PM

Don't worry i'm not spamming, after this one i'll restrain myself.

Just a thought experiment, the objects used on this are emitting light than can be used for spectroscopic measurements. The relation between relativistic velocity and astronomical redshift is non-lineair, as can be seen on the v/c vs redshift z graph on this page:

http://www.asterism.org/tutorials/tut29-1.htm

A central object (CO) is moving away at high relativistic velocity from a stationery observer. Close by on the left side of this central object is an object (LO) that is moving away from the observer at a slightly higher velocity than CO (CO+x). On the right side of the central object is an object (RO) that is moving away from the observer at a slightly lower velocity than CO, equal to the difference in velocity from the left and central object (CO-x).

At the moment the spectrum is taken from the three objects they are exactly aligned with respect to the observer.

After the measurement there are three spectral line shifts from three different objects. Now the difference in shift of absorption lines / emission lines between CO-LO and CO-RO can be measured.

It was a bit silly to call it an observer because he is not shown the spectral measurements eg absolute wavelenght lines.

He/she is only given:

- the measured differences in spectral line shift between CO-LO and CO-RO

- the graph / formulae of relativistic redshift from above link

- the fact that the difference in relativistic velocity between CO-LO and CO-RO is exactly the same

Is it correct that (since the relative velocity-spectral line shift relation is not lineair):

- the difference in line shift between CO-LO is always greater than that of CO-RO?

- And the magnitude of this difference depends ONLY on the absolute relativistic velocity? (Not x?)

- the 'observer' can deduce the relativistic velocity of CO because of this?

And is this already used?

Just a thought experiment, the objects used on this are emitting light than can be used for spectroscopic measurements. The relation between relativistic velocity and astronomical redshift is non-lineair, as can be seen on the v/c vs redshift z graph on this page:

http://www.asterism.org/tutorials/tut29-1.htm

A central object (CO) is moving away at high relativistic velocity from a stationery observer. Close by on the left side of this central object is an object (LO) that is moving away from the observer at a slightly higher velocity than CO (CO+x). On the right side of the central object is an object (RO) that is moving away from the observer at a slightly lower velocity than CO, equal to the difference in velocity from the left and central object (CO-x).

At the moment the spectrum is taken from the three objects they are exactly aligned with respect to the observer.

After the measurement there are three spectral line shifts from three different objects. Now the difference in shift of absorption lines / emission lines between CO-LO and CO-RO can be measured.

It was a bit silly to call it an observer because he is not shown the spectral measurements eg absolute wavelenght lines.

He/she is only given:

- the measured differences in spectral line shift between CO-LO and CO-RO

- the graph / formulae of relativistic redshift from above link

- the fact that the difference in relativistic velocity between CO-LO and CO-RO is exactly the same

Is it correct that (since the relative velocity-spectral line shift relation is not lineair):

- the difference in line shift between CO-LO is always greater than that of CO-RO?

- And the magnitude of this difference depends ONLY on the absolute relativistic velocity? (Not x?)

- the 'observer' can deduce the relativistic velocity of CO because of this?

And is this already used?