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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

Topology of Luminous Red Galaxy in the SDSS

Yun-Young Choi, Changbom Park, & Juhan Kim

KIAS

SDSS-KSG Meeting

slide2

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
acoustic oscillation
Acoustic Oscillation

SDSS-LRG

http://sdss.org

large scale correlation

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

slide10

30°

45°

60°

12h

8h

11h

9h

10h

Dr4+ LRG sample: ~80k galaxies

topology of lrg
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%

slide14

MAIN

LRG

Biasedgalaxy formation at lowdensity environments – more connected

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