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Cosmic Momentum Field and Matter Fluctuation Study of Matter through Motions of Galaxies

KIAS 050525. Cosmic Momentum Field and Matter Fluctuation Study of Matter through Motions of Galaxies. 2005. 5. 25 Changbom Park (Korea Institute for Advanced Study). Cosmic Velocity & Momentum Fields. Peculiar velocity v pec = Total velocity – Hubble expansion velocity (true distance).

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Cosmic Momentum Field and Matter Fluctuation Study of Matter through Motions of Galaxies

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  1. KIAS 050525 Cosmic Momentum Field and Matter FluctuationStudy of Matter through Motions of Galaxies 2005. 5. 25 Changbom Park (Korea Institute for Advanced Study)

  2. Cosmic Velocity & Momentum Fields Peculiar velocity vpec = Total velocity – Hubble expansion velocity (true distance) p = (ρ/ρb)v = (1+δ) v &

  3. Motivations 1. Mass fluctuation field 2. Biasing (mass vs galaxy fields) 3. LSS free of redshift space distortions 4. Gravitational Instability

  4. Our Local Universe

  5. Overall Plan Galaxy Distance using redshift-independent distance indicators x & vr(x) of galaxies Pρ(k) &Pp(k) Ωm1.2Pρ(k) & Ωm0.6/b ‘Total’ Matter Distribution Cosmological Models

  6. Why should this work? Peculiar velocity vpec = Total velocity – Hubble expansion velocity (true distance)

  7. Distance Indicators * Tully-Fisher Relation : Spirals(Luminosity – Circular Velocity) * Dn-σ Relation :Ellipticals (Diameter – Velocity dispersion) (Distance error of ~ 20%)

  8. Observations 1. Mark III: ~3300 galaxies. TF & Dn-σ indicators A82 + 7S88 + HMCL90-91-92 + W91PP + MAT92 + W91CL + CF92-93-96 2. SFI: 1216 Sbc~Sc galaxies SCI: ~800 galaxies in 24 clusters 3. ENEARf: ~1400, T =<-2. B<14.5, cz < 7000km/s ENEARc: ~500, E & S0 galaxies in 28 clusters EFAR: 736 early types in 85 clusters 4. KLUN+: 6229 galaxies. cz<8000km/s

  9. Momentum Field p = (1+δ) v Momentum PS (prediction) ≈ Observed Momentum PS  β estimation

  10. SFI Galaxy Sample Giovanelli et al. (1997) 1289 Spiral Galaxies with I-band Tully-Fisher Distance SFI Main Galaxies + MAT Sample (δ < – 45º region, D ≥ 1.7') 661 Galaxies with D ≥ 1.7'

  11. ENEAR Galaxy Sample 1145 early-type galaxies with Dn-σ distances (mB<=14.5, cz <= 7000 km/s) merging (625 objects; |b|>15º) • 261 Groups/Clusters (734 gals) • 364 Field Galaxies

  12. Measuring Density & Momentum PS Fourier Transform Power Spectrum

  13. Density and Momentum Power Spectra 100 Mock Obs. (ENEAR)

  14. Estimating β=Ω0.6/b ENEAR At linear regime (>~ 80 h-1Mpc) At quasi-linear regime (>~ 40 h-1Mpc)

  15. SFI ENEAR vs SFI ENEAR SFI results

  16. Comparison with Other Results

  17. Future Works Era of Mass Fluctuation Exploration ! 1. All sky deep sample 2. Theories applicable to noisy but large samples  (2dF, SDSS, etc.) 3. Accurate distance estimator 4. Cluster galaxy survey 5. Well-defined survey

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