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## Summary:

- Why the Poisson noise level is set to 2 after applying Leahy normalization

I am studying about power spectrum analysis in high energy astrophysics.

I cannot understand why the Poisson noise level is set to 2 after applying Leahy normalization.

$$P_{j}=2 /_{N \mathrm{ph}}\left|a_{j}\right|^{2}$$

The above is the equation for leahy norm, Can I expand the equation from here to require that the Poisson noise level is 2?

Thank you.

I cannot understand why the Poisson noise level is set to 2 after applying Leahy normalization.

$$P_{j}=2 /_{N \mathrm{ph}}\left|a_{j}\right|^{2}$$

The above is the equation for leahy norm, Can I expand the equation from here to require that the Poisson noise level is 2?

Thank you.