Add a halo catalog -> SZ map module in ltu-cmass - Githubissues

maho3 / ltu-cmass

A modular simulator of CMASS-NGC galaxy clustering

6 stars 1 forks source link

Add a halo catalog -> SZ map module in ltu-cmass #10

Open maho3 opened 3 months ago

maho3 commented 3 months ago

@shivampcosmo has code which translates catalogs of halo masses and sky positions into a healpix SZ signal (differentiably!). It follows the implementation in this paper (Shivam check?).

The goal of this task is to integrate this into the tail end of the ltu-cmass pipeline.

The module would fit in following, or in parallel with, the ngc_selection.py script, which takes a cuboid volume of galaxies and creates a sky-projected map of CMASS.

Definition of done:

[ ] A new module in cmass/survey which processes ltu-cmass halo catalogs into SZ signal
[ ] A plot of a selection of ltu-cmass galaxies along with the corresponding (idealized) SZ signal

shivampcosmo commented 3 months ago

the prescription for pressure profile that i have working is from this paper https://arxiv.org/abs/2401.18072 .

Another thing is that I think we also need to add the SZ contribution from low and high redshift LSS (other than CMASS redshift distribution) as that would be a major source of noise in the map (in addition to normal instrumental noise). That should not be very hard to do as that structure is uncorrelated and it only matters that there is correct number of them which i think can be done by taking mock halo catalog lightcone from N-body for redshifts other than CMASS. I will check if that actually works or not.