Cosmic flows on 100 h−1 Mpc scales: standardized minimum variance bulk flow, shear and octupole moments
By H. Feldman, R. Watkins, M. Hudson. 2009
173 citations recorded by the source corpus.
The low order moments, such as the bulk flow and shear, of the large scale peculiar velocity field are sensitive probes of the matter density fluctuations on very large scales. In practice, however, peculiar velocity surveys are usually sparse and noisy, which can lead to the aliasing of small scale power into what is meant to be a probe of the largest scales. Previously, we developed an optimal “minimum variance” (MV) weighting scheme, designed to overcome this problem by minimizing the difference between the measured bulk flow (BF) and that which would be measured by an ideal survey. Here we extend this MV analysis to include the shear and octupole moments, which are designed to have almost no correlations between them so that they are virtually orthogonal. We apply this MV analysis to a compilation of all major peculiar velocity surveys, consisting of 4536 measurements. Our estimate of the BF on scales of � 100h 1 Mpc has a magnitude of |v| = 416±78 km/s towards Galactic l = 282 o ±11 o
Subfields: Astronomy and Astrophysics, Global and Planetary Change
View Paper: https://www.semanticscholar.org/paper/500f1c8829593fd89422421b1880b3c5fd8f24c3
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Citations in the corpus
- A NEW MEASUREMENT OF THE BULK FLOW OF X-RAY LUMINOUS CLUSTERS OF GALAXIES (2009, background): “Feldman et al. (2009) extend the Watkins et al. analysis and find that the absence of shear in their flow at 50–100 Mpc is consistent with the KABKE1 suggestion of the attractor at superhorizon distances.”
- Evidence for anisotropy of cosmic acceleration (2018, background): “This is reasonable as the directions of the reported bulk flows (Hudson et al. 2004; Watkins et al. 2009; Lavaux et al. 2010; Feldman et al. 2010; Colin et al. 2011; Feindt et al. 2013; Magoulas et al. 2016) are all within ∼40◦ of each other and of the CMB dipole.”
- Local gravity versus local velocity: solutions for β and non-linear bias (2010, background): “(vii) We find no evidence for large-scale flows such as reported by, for example, Hudson et al. (1999), Hudson & Ebeling (1997) and Feldman et al. (2010).”
- Cosmic flows in the nearby universe from Type Ia supernovae (2011, background): “Feldman et al. (2010) measured the tidal and higher order terms for the ‘Composite’ sample of Watkins et al. (2009), but found them to be small.”
- The current status of galaxy formation (2012, background): “This is an important issue as the normalization, slope and linearity of the BTFR have been used as evidence for MOdified Newtonian Dynamics (MOND, Milgrom, 1983) and against ΛCDM.”