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

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Cosmic Momentum Field and Matter Fluctuation
Study of Matter through Motions of Galaxies
KIAS 050525

• 2005. 5. 25
• Changbom Park
• (Korea Institute for Advanced Study)

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Cosmic Velocity Momentum Fields
Peculiar velocity vpec Total velocity Hubble
expansion velocity (true distance)
p (?/?b)v (1d) v
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Motivations
1. Mass fluctuation field 2. Biasing (mass vs
galaxy fields) 3. LSS free of redshift space
distortions 4. Gravitational Instability
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(No Transcript)
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Our Local Universe
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Overall Plan
Galaxy Distance using redshift-independent
distance indicators
x vr(x) of galaxies
P?(k) Pp(k)
Om1.2 P?(k) Om0.6/b
Total Matter Distribution Cosmological Models
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Why should this work?
Peculiar velocity vpec Total velocity Hubble
expansion velocity (true distance)
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Distance Indicators
Tully-Fisher Relation Spirals (Luminosity
Circular Velocity)
Dn-s Relation Ellipticals (Diameter
Velocity dispersion)
(Distance error of 20)
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Observations
1. Mark III 3300 galaxies. TF Dn-s indicators
A82 7S88 HMCL90-91-92 W91PP MAT92
W91CL CF92-93-96 2. SFI 1216 SbcSc
galaxies SCI 800 galaxies in 24
clusters 3. ENEARf 1400, T lt-2. Blt14.5, cz lt
7000km/s ENEARc 500, E S0 galaxies in 28
clusters EFAR 736 early types in 85
clusters 4. KLUN 6229 galaxies. czlt8000km/s
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Momentum Field
p (1d) v
Momentum PS (prediction) Observed Momentum
PS ? ß estimation
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SFI Galaxy Sample
Giovanelli et al. (1997)
1289 Spiral Galaxies with I-band Tully-Fisher
Distance
SFI Main Galaxies MAT Sample (d lt 45º region,
D 1.7')
661 Galaxies with D 1.7'
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ENEAR Galaxy Sample
1145 early-type galaxies with Dn-s distances
(mBlt14.5, cz lt 7000 km/s)
merging (625 objects bgt15º)

• 261 Groups/Clusters (734 gals)
• 364 Field Galaxies

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Measuring Density Momentum PS
Fourier Transform
Power Spectrum
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Density and Momentum Power Spectra
100 Mock Obs. (ENEAR)
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Estimating ßO0.6/b
ENEAR
At linear regime (gt 80 h-1Mpc)
At quasi-linear regime (gt 40 h-1Mpc)
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SFI
ENEAR vs SFI
ENEAR
SFI results
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Comparison with Other Results
ßE,S s8Om0.6 Data Method Ref.
0.460.06 -0.05 0.88 ENEAR Mom. PS This Study
0.49 0.08 -0.05 0.56 SFI Mom. PS This Study
0.50 ENEAR, IRAS PSCz OME Nusser et al. (2001)
0.51 ENEAR CF Borgani et al. (2000a)
1.10 ENEAR ML Zaroubi et al. (2001)
0.6 SFI, IRAS 1.2 Jy OME Da Costa et al. (1998)
0.42 SFI, IRAS PSCz VELMOD Branchini et al. (2001)
0.82 SFI ML Freudling et al. (1999)
0.3 SFI CF Borgani et al. (2000b)
0.63 SFI ML Silberman et al. (2001)
0.51 0.56 MAT Mom. PS Park (2000)
0.51 SFIENEAR, PSCz UMV (v-v) Zaroubi et al. (2002)
0.57 SFIENEAR, PSCz UMV (d-d) Zaroubi et al. (2002)
0.40 SNIa, IRAS 1.2 Jy ?2 fit Riess et al. (1997)
0.55 SNIa, PSCz ?2 fit Radburn-Smith et al. (2004)
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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