Bulk flow in the combined 2MTF and 6dFGSv surveys

Abstract

We create a combined sample of 10,904 late and early-type galaxies from the 2MTF and 6dFGSv surveys in order to accurately measure bulk flow in the local Universe. Galaxies and groups of galaxies common between the two surveys are used to verify that the difference in zero-points is $<0.02$ dex. We introduce a maximum likelihood estimator ($\eta$MLE) for bulk flow measurements which allows for more accurate measurement in the presence non-Gaussian measurement errors. To calibrate out residual biases due to the subtle interaction of selection effects, Malmquist bias and anisotropic sky distribution, the estimator is tested on mock catalogues generated from 16 independent large-scale GiggleZ and SURFS simulations. The bulk flow of the local Universe using the combined data set, corresponding to a scale size of 40 h${}^{-1}$ Mpc, is $288\pm 24$ km s${}^{-1}$ in the direction $(l,b)=(296\pm 6^{\circ },21\pm 5^{\circ })$. This is the most accurate bulk flow measurement to date, and the amplitude of the flow is consistent with the $\Lambda$CDM expectation for similar size scales.

arXiv comment17 pages, 14+6 figures, published in MNRAS, May/2018

References in corpus (37)

• Efficient Computation of CMB anisotropies in closed FRW models
• The 6dF Galaxy Survey: Final Redshift Release (DR3) and Southern Large-Scale Structures
• Modeling Luminosity-Dependent Galaxy Clustering Through Cosmic Time
• The 2MASS Redshift Survey - Description and Data Release
• The Arecibo Legacy Fast ALFA Survey: The alpha.40 HI Source Catalog, its Characteristics and their Impact on the Derivation of the HI Mass Function
• The 6dF Galaxy Survey: Samples, Observational Techniques and the First Data Release
• CMB power spectrum parameter degeneracies in the era of precision cosmology
• A Digital Archive of HI 21 cm Line Spectra of Optically-targeted Galaxies
• The K-Band Galaxy Luminosity Function
• Consistently Large Cosmic Flows on Scales of 100 Mpc/h: a Challenge for the Standard LCDM Cosmology
• Cosmic flows in the nearby universe from Type Ia Supernovae
• Groups of Galaxies in the Two Micron All-Sky Redshift Survey
• Correlated Fluctuations in Luminosity Distance and the (Surprising) Importance of Peculiar Motion in Supernova Surveys
• Probing the anisotropic local universe and beyond with SNe Ia data
• Cosmic Flows on 100 Mpc/h Scales: Standardized Minimum Variance Bulk Flow, Shear and Octupole Moments
• Local Gravity versus Local Velocity: Solutions for $\beta$ and nonlinear bias
• The 6dF Galaxy Survey: Peculiar Velocity Field and Cosmography
• The 6dF Galaxy Velocity Survey: Cosmological constraints from the velocity power spectrum
• The 6dF Galaxy Survey: The Near-Infrared Fundamental Plane of Early-Type Galaxies
• 2MTF I. The Tully-Fisher Relation in the 2MASS J, H and K Bands
• Overview on spectral line source finding and visualisation
• The 6dF Galaxy Survey: Bulk Flows on $50-70h^{-1}$ Mpc scales
• 2MTF VI. Measuring the velocity power spectrum
• The Taipan Galaxy Survey: Scientific Goals and Observing Strategy
• Deriving accurate peculiar velocities (even at high redshift)
• Cosmological Forecasts for Combined and Next Generation Peculiar Velocity Surveys
• The 6dF Galaxy Survey: Fundamental Plane Data
• SURFS: Riding the waves with Synthetic UniveRses For Surveys
• Cosmic bulk flows on 50 {h}^{-1}Mpc scales: A Bayesian hyper-parameter method and multishells likelihood analysis
• An Unbiased Estimator of Peculiar Velocity with Gaussian Distributed Errors for Precision Cosmology
• 2MTF IV. A bulk flow measurement of the local Universe
• Current Status Of Velocity Field Surveys: A Consistency Check
• 2MTF III. HI 21cm observations of 1194 spiral galaxies with the Green Bank Telescope
• The Gigaparsec WiggleZ Simulations: Characterising scale dependant bias and associated systematics in growth of structure measurements
• 2MTF II. New Parkes 21-cm observations of 303 southern galaxies
• Bulk flow of halos in ΛCDM simulation
• Cosmology with Peculiar Velocities: Observational Effects

Cited by in corpus (17)

• Is the Observable Universe Consistent with the Cosmological Principle?
• Cosmicflows-4
• The Pantheon+ Analysis: Evaluating Peculiar Velocity Corrections in Cosmological Analyses with Nearby Type Ia Supernovae
• The Redshift Space Momentum Power Spectrum II: measuring the growth rate from the combined 2MTF and 6dFGSv surveys
• The Sloan Digital Sky Survey Peculiar Velocity Catalogue
• Standard Siren Speeds: Improving velocities in gravitational-wave measurements of $H_0$
• Evaluating bulk flow estimators for CosmicFlows-4 measurements
• Target Selection for the DESI Peculiar Velocity Survey
• The Redshift-Space Momentum Power Spectrum I: Optimal Estimation From Peculiar Velocity Surveys
• 2MTF - VII. 2MASS Tully-Fisher survey final data release: distances for 2,062 nearby spiral galaxies
• Bulk flow and shear in the local Universe: 2MTF and COSMICFLOWS-3
• Identification of Basins of Attraction in the Local Universe
• Cosmic Flow Measurement and Mock Sampling Algorithm of Cosmicflows-4 Tully-Fisher Catalogue
• A Zone of Avoidance catalogue of 2MASS bright galaxies. I. Sample description and analysis
• Gaussianization of peculiar velocities and bulk flow measurement
• Pattern of perturbations from a coherent quantum inflationary horizon
• The Distance and Peculiar Velocity of the Norma cluster (ACO 3627) using the Near-Infrared $J$ and $K_s$-band Fundamental Plane Relations