Noise estimation from real data

[viajani]

Description of the issue

When working with simulations only I compute the peak counts on maps expressed in signal to noise S/N as I assume to know the noise (since I generate it to apply it to the mock maps).

For real data, as the provided map already contains the noise I have run the likelihood analysis computing peak counts on the noisy filtered convergence map without considering its ratio over the noise.

List of tasks to do within this issue:

• discuss this point during the telecon to understand how to estimate the noise from real data
• define the final quantity to use for the analysis (if only the noisy smoothed convergence or the S/N)

[viajani]

1. use same noise as the one added to the sims also for real data as first test