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Topology of Luminous Red Galaxy in the SDSS

This study explores the topology of luminous red galaxies in the SDSS, focusing on galaxy clustering, galaxy clusters, and the evolution of massive galaxies. It also discusses the acoustic oscillation and correlation of galaxy bias.

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Topology of Luminous Red Galaxy in the SDSS

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  1. Topology of Luminous Red Galaxy in the SDSS Yun-Young Choi, Changbom Park, & Juhan Kim KIAS SDSS-KSG Meeting

  2. 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 • Excellent redshift success rate • Science Goals: • Clustering on largest scales • Galaxy clusters to z~0.5 • Evolution of massive galaxies

  3. Max Tegmark

  4. Acoustic Oscillation SDSS-LRG http://sdss.org

  5. Acoustic series in P(k) becomes a single peak in x(r)! Pure CDM model has no peak. Large Scale Correlation Galaxy bias Non-linear structure evolution Redshift distortion

  6. 30° 45° 60° 12h 8h 11h 9h 10h Dr4+ LRG sample: ~80k galaxies

  7. Blanton et al.

  8. Topology of LRG Genus – Measure of Topology (Gott, Dickinson, and Melott 1986) A measure of the degree of connectivity of the smoothed galaxy # density field High 50% High 8%

  9. MAIN LRG Biasedgalaxy formation at lowdensity environments – more connected

  10. Environmental Dependency of LF LRG MAIN MAIN

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