The error bars of redshift drift

[shadishacker]

Dear all,

I am reading the paper "Cosmic dynamics in the era of Extremely Large Telescopes " by Liske et al. about redshift.
I get the physical meaning of redshift drift, but when it comes to the error bars, I am confused.
- Aren't the error bars given in equation (15) ?
- Isn't this function plotted in figure 7 with S/N=13000 and N=10 ? (the red solid line??)
- If so, then why am I getting something different while plotting it? Is there something I am missing?

 

[AndyW]

Thank you for your question about the paper "Cosmic dynamics in the era of Extremely Large Telescopes" by Liske et al. regarding redshift. To answer your questions:

1. The error bars in equation (15) refer to the uncertainties in the measured redshift drift, which is the change in redshift over time. These uncertainties can arise from various sources such as instrumental noise, calibration errors, and other systematic effects.

2. Yes, the function plotted in figure 7 with S/N=13000 and N=10 is the red solid line. This line represents the expected redshift drift signal for a given signal-to-noise ratio (S/N) and number of measurements (N).

3. It is possible that you are getting a different result while plotting the function because of the specific values you are using for S/N and N. Please make sure that you are using the correct values and following the same methodology as described in the paper. It is also important to note that the redshift drift signal is a small effect and can be easily affected by any errors or uncertainties in the measurements.

I hope this helps clarify your confusion. If you have any further questions, please do not hesitate to ask. Best of luck with your research.