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Fix for p-astro model

weichangfeng guo requested to merge p-astro into main

This branch is making quick fixes for p-astro model in O4 run.

  1. Optimize the calculation of p(Astro).

    1. The updated method uses different two-component (signal vs noise) model for different source.

    2. The method first calculates relative source probabilities, then calculate p(Astro) over source categories and weight them by relative source probabilities to get the sum p(Astro). This will suppress the p(Astro) if a trigger is highly likely considered as a BNS/NSBH rather than a BBH.

  2. Optimize the source classification.

    1. We will apply astrophysical rates to the chirp mass contour plot. The resulting weighted area that falls within a chirp mass contour will be summed for each source region to find the the probability of each source.
    2. This will be completed in a follow-up change.
Edited by Timothy Davies

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