Topology of Luminous Red Galaxy in the SDSS. Yun-Young Choi, Changbom Park, & Juhan Kim KIAS. Introduction to SDSS LRGs. Eisenstein et al. 2001. SDSS uses color to target luminous, early-type galaxies at 0.2< z <0.5. Fainter than MAIN ( r <19.5) About 15/sq deg
Topology of Luminous Red Galaxy in the SDSS
Yun-Young Choi, Changbom Park, & Juhan Kim
Introduction to SDSS LRGs
Eisenstein et al. 2001
Acoustic series in P(k) becomes a single peak in x(r)!
Pure CDM model has no peak.
Non-linear structure evolution
Dr4+ LRG sample: ~80k galaxies
Blanton et al.
Genus – Measure of Topology
(Gott, Dickinson, and Melott 1986)
A measure of the degree of connectivity of the smoothed galaxy # density field
Biasedgalaxy formation at lowdensity environments – more connected
Environmental Dependency of LF