Risa Wechsler - Astronomy and Astrophysics
Risa Wechsler - Astronomy and Astrophysics
Risa Wechsler - Astronomy and Astrophysics
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how to predict cluster observables theoretically?<br />
two-part question:<br />
• how are galaxies connected to dark matter (bias/halo occupation)<br />
• how are clusters observables connected to real groups/clusters of galaxies?<br />
mock catalogs that connect theoretically understood quantities to the full<br />
richness of the SDSS data set:<br />
• need a large simulated volume: would like to have a method that can work<br />
without high resolution simulations<br />
• best cluster finders depend on galaxy luminosity <strong>and</strong> color; need galaxies with<br />
realistic luminosities & colors <strong>and</strong> to match joint luminosity-color distribution as a<br />
function of redshift & local density<br />
• run identical analysis code used on data on simulations<br />
basic method<br />
1. populate the simulation with the measured luminosity function.<br />
2. luminosity dependent bias: assign galaxies to dark matter particles based on<br />
the local dark matter galaxy distribution by tuning P(δ dm |L) to match the<br />
observed luminosity dependent 2-pt. correlation function<br />
3. color based on the luminosity <strong>and</strong> local galaxy density: each mock galaxy gets<br />
assigned a real SDSS galaxy from a volume-limited sample, based on its<br />
luminosity <strong>and</strong> galaxy density
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