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Topology of Luminous Red Galaxy in the SDSS

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

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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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