Local gravity versus local velocity: solutions for β and non-linear bias

By M. Davis, A. Nusser, Karen L. Masters, C. Springob, J. Huchra, Gerard Lemson. 2010

150 citations recorded by the source corpus.

We perform a reconstruction of the cosmological large scale flows in the nearby Universe using two complementary observational sets. The first, the SFI++ sample of Tully-Fisher (TF) measurements of galaxies, provides a direct probe of the flows. The second, the whole sky distribution of galaxies in the 2MASS redshift survey (2MRS), yields a prediction of the flows given the cosmological density parameter, , and a biasing relation between mass and galaxies. We aim at an unbiased comparison between the peculiar velocity fields extracted from the two data sets and its implication on the cosmological parameters and the biasing relation. We expand the fields in a set of orthonormal basis functions, each representing a plausible realization of a cosmological velocity field smoothed in such a way as to give a nearly constant error on the derived SFI++ velocities. The statistical analysis is done on the coefficients of the modal expansion of the fields by means of the basis functions. Our analysis completely avoids the strong error covariance in the smoothed TF velocities by the use of orthonormal basis functions and employs elaborate mock data sets to extensively calibrate the errors in 2MRS predicted velocities. We relate the 2MRS galaxy distribution to the mass density field by a linear bias factor, b, and include a luminosity dependent, / L � , galaxy weighting. We assess the agreement between the fields as a �

Subfields: Astronomy and Astrophysics, Instrumentation

View Paper: https://www.semanticscholar.org/paper/600ee1f85de4a5813a7b9758c338abfaf024c340

How researchers see this paper

The researchers whose trusted networks rank it highest, strongest advocate first. Every researcher gets a different order.

In Astronomy and Astrophysics

In Instrumentation

Citations in the corpus

Evolution of the f σ 8 tension with the Planck 15 / Λ CDM determination and implications for modified gravity theories (2018, background): “[77] Marc Davis, Adi Nusser, Karen Masters, Christopher Springob, John P.”
Cosmological parameters from the comparison of peculiar velocities with predictions from the 2M++ density field (2014, methodology): “Using this method of velocity-velocity comparison, a number of recent studies have constrained this parameter combination (Pike & Hudson 2005; Davis et al. 2011; Branchini et al. 2012; Turnbull et al. 2012).”
The 2M++ galaxy redshift catalogue (2011, methodology): “This procedure has already also been used with success with observation and mock catalogues (e.g. Lavaux et al. 2008, 2010; Davis et al. 2011).”
The 6dF Galaxy Survey: z \approx 0 measurement of the growth rate and sigma_8 (2012, unknown): “Alternative methods for deriving σ8 or fσ8 at low redshift are provided by peculiar velocity surveys (e.g. Gordon, Land & Slosar 2007; Abate & Erdogu 2009; Nusser & Davis 2011; Turnbull et al. 2011; Davis et al. 2011; Hudson & Turnbull 2012).”
Tension and constraints on modified gravity parametrizations of $G_{\textrm{eff}}(z)$ from growth rate and Planck data (2017, background): “[57] Marc Davis, Adi Nusser, Karen Masters, Christopher”