Large-scale homogeneity vs. small- scale inhomogeneity: testing ...

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01/18/2013 Several potential systematics: • Velocity samples difficult to compare − Shallow & dense <strong>vs</strong>. deep & sparse − Distance indicators: SNe, FP, TF • Partial sky can induce systematic error • Logarithmic distance errors • Difficult to compare velocities with density field • Need all-sky, deeper peculiar velocity surveys • Homogeneous selection • Accurate modelling of systematics Problems for Bulk flow measurements Morag I. Scrimgeour 42
• Widefield ASKAP L-band Legacy All-sky Blind surveY • 21cm HI survey • All southern sky • z < 0.05 WALLABY Peculiar Velocities • Westerbork Northern HI Sky Survey (WNSHS, with Apertif) will provide coverage >+30° in north • Photometry from SkyMapper or WISE? • ~30,000 WALLABY + WNSHS Tully-Fisher distances 01/18/2013 Morag I. Scrimgeour 43
Page 1 and 2: ICRAR is a partnership between the
Page 3 and 4: 01/18/2013 Testing large-scale cosm
Page 5 and 6: Inhomogeneity: alternative to Dark
Page 7 and 8: • So far, results are conflicting
Page 9 and 10: Fractal (correlation) dimension D 2
Page 11 and 12: 01/18/2013 Selection Function Corre
Page 13 and 14: • In ΛCDM expect: − Small scal
Page 15 and 16: How do we define the “homogeneity
Page 17 and 18: 01/18/2013 0.3
Page 19 and 20: 01/18/2013 0.7
Page 21 and 22: 01/18/2013 ΛCDM D 2(r) model: effe
Page 23 and 24: Scrimgeour et al. (2012) 01/18/2013
Page 25 and 26: • WiggleZ measurement of homogene
Page 27 and 28: 01/18/2013 What are peculiar veloci
Page 29 and 30: 01/18/2013 Large-scale Dark Matter
Page 32 and 33: • Nature of dark energy − Expan
Page 34 and 35: • Nature of dark energy Peculiar
Page 36 and 37: 01/18/2013 • Bulk Flow / dipole (
Page 38 and 39: Bulk flows and dark flows: a proble
Page 40 and 41: 01/18/2013 Conflicting σ 8 constra
Page 44 and 45: 6dFGS Peculiar Velocities • Spect
Page 46 and 47: ~500 Type Ia SNe over 5 years (Scri
Page 48 and 49: 01/18/2013 Bulk flow distribution
Page 50 and 51: 01/18/2013 True bulk flow The ‘re
Page 52 and 53: 01/18/2013 True bulk flow Observed
Page 54 and 55: 01/18/2013 Bulk Flow Systematics fr
Page 56 and 57: N(z) 01/18/2013 4000 3500 3000 2500
Page 58: Homogeneity in the WiggleZ Survey S

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