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Showing content from https://github.com/moustakas/legacyhalos below:

moustakas/legacyhalos: Code and papers for a multi-faceted study of the baryonic content of dark matter halos in Legacy Survey imaging.

The DESI Legacy Imaging Surveys have delivered deep grz optical imaging and unWISE W1 and W2 mid-infrared imaging of over 20,000 sq. deg of the extragalactic sky.

This repository contains code and papers for a multi-pronged analysis of the group- and cluster-scale dark matter halos identified in Legacy Survey imaging, particularly the stellar mass content of the central galaxies.

The key science goals are to:

1. Obtain an accurate census of the integrated stellar masses of massive central galaxies---which dominate the massive end of the galaxy stellar mass function---as a function of halo mass and redshift.
2. Measure the stellar mass density profiles and structural properties (e.g., half-mass radius, concentration), and their correlation with dark matter halo assembly histories.
3. Measure the stellar mass-halo mass relation and the scatter in the stellar masses of central galaxies, as a probe of star formation efficiency and feedback in massive systems.
4. Measure the fraction of stars formed in situ versus ex situ in massive spheroidal galaxies.
5. And much more...!

We gratefully acknowledge funding support for this work from the National Science Foundation under grants AST-1616414 and AST-1909374, and the U.S. Department of Energy, Office of Science, Office of High Energy Physics under Award Number DE-SC0020086.

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