Local Hole revisited: evidence for bulk motions and self-consistent outflow

Abstract

We revisit our mapping of the `Local Hole', a large underdensity in the local galaxy redshift distribution that extends out to redshift, $z\approx 0.05$ and a potential source of outflows that may perturb the global expansion rate and thus help mitigate the present `$H_0$ tension'. First, we compare local peculiar velocities measured via the galaxy average redshift-magnitude Hubble diagram, $\bar{z}(m)$, with a simple dynamical outflow model based on the average underdensity in the Local Hole. We find that this outflow model is in good agreement with our peculiar velocity measurements from $\bar{z}(m)$ and not significantly inconsistent with SNIa peculiar velocity measurements from at least the largest previous survey. This outflow could cause an $\approx 2-3$\% increase in the local value of Hubble's constant. Second, considering anisotropic motions, we find that the addition of the outflow model may improve the $\bar{z}(m)$ fit of a bulk flow where galaxies are otherwise at rest in the Local Group frame. We conclude that the Local Hole plus neighbouring overdensities such as the Shapley Supercluster may cause outflow and bulk motions out to $\approx 150$h${}^{-1}$Mpc that are cosmologically significant and that need to be taken into account in estimating Hubble's constant.

arXiv comment7 Pages, 3 Figures, 1 Table, improved referencing, now accepted by MNRAS

References in corpus (44)

• First Year Wilkinson Microwave Anisotropy Probe (WMAP) Observations: Determination of Cosmological Parameters
• Gaia Data Release 2. Summary of the contents and survey properties
• The Complete Light-curve Sample of Spectroscopically Confirmed Type Ia Supernovae from Pan-STARRS1 and Cosmological Constraints from The Combined Pantheon Sample
• The Carnegie-Chicago Hubble Program. VIII. An Independent Determination of the Hubble Constant Based on the Tip of the Red Giant Branch
• Milky Way Cepheid Standards for Measuring Cosmic Distances and Application to Gaia DR2: Implications for the Hubble Constant
• New Parallaxes of Galactic Cepheids from Spatially Scanning the Hubble Space Telescope: Implications for the Hubble Constant
• Cosmicflows-3
• Our Peculiar Motion Away from the Local Void
• Consistently Large Cosmic Flows on Scales of 100 Mpc/h: a Challenge for the Standard LCDM Cosmology
• The SBF Survey of Galaxy Distances. II. Local and Large-Scale Flows
• Cosmological parameters from the comparison of peculiar velocities with predictions from the 2M++ density field
• Cosmic flows in the nearby universe from Type Ia Supernovae
• Local Gravity versus Local Velocity: Solutions for $\beta$ and nonlinear bias
• The Local Perspective on the Hubble Tension: Local Structure Does Not Impact Measurement of the Hubble Constant
• Physical Bayesian modelling of the non-linear matter distribution: new insights into the Nearby Universe
• POTENT Reconstruction from Mark III Velocities
• Sample variance in the local measurements of the Hubble constant
• GAIA Cepheid parallaxes and 'Local Hole' relieve $H_0$ tension
• The 6dF Galaxy Survey: Bulk Flows on $50-70h^{-1}$ Mpc scales
• The Local Hole in the Galaxy Distribution: Evidence from 2MASS
• Deriving accurate peculiar velocities (even at high redshift)
• The Local Hole revealed by galaxy counts and redshifts
• Cosmic variance of the local Hubble flow in large-scale cosmological simulations
• Observational evidence for a local underdensity in the Universe and its effect on the measurement of the Hubble Constant
• The Local Hole in the Galaxy Distribution: New Optical Evidence
• Bulk flows from galaxy luminosities: application to 2MASS redshift survey and forecast for next-generation datasets
• Exploring the evidence for a large local void with supernovae Ia data
• Power Spectrum Estimation from Peculiar Velocity Catalogues
• Large-scale Cosmic Flows from Cosmicflows-2 Catalog
• Probing spatial homogeneity with LTB models: a detailed discussion
• Speed from light: growth rate and bulk flow at z ~ 0.1 from improved SDSS DR13 photometry
• Void galaxies in the nearby Universe. I. Sample description
• The KBC Void: Consistency with Supernovae Type Ia and the Kinematic SZ Effect in a $\Lambda$LTB Model
• A Slight Excess of Large Scale Power from Moments of the Peculiar Velocity Field
• Testing for a large local void by investigating the Near-Infrared Galaxy Luminosity Function
• Constraints on field flows of quintessence dark energy
• The variance of the locally measured Hubble parameter explained with different estimators
• The galaxy luminosity function and the Local Hole
• The extended ROSAT-ESO Flux-Limited X-ray Galaxy Cluster Survey (REFLEX II) V. Exploring a local underdensity in the Southern Sky
• Draining the Local Void
• Seven Problems with the Claims Related to the Hubble Tension in arXiv:1810.02595
• On methods of estimating cosmological bulk flows
• An Inconsistency in standard Maximum Likelihood Estimation of Bulk Flows
• $H_0$ Tension: Response to Riess et al arXiv:1810.03526

Cited by in corpus (18)

• On the Hubble constant tension in the SNe Ia Pantheon sample
• The CosmoVerse White Paper: Addressing observational tensions in cosmology with systematics and fundamental physics
• Cosmological implications of the anisotropy of ten galaxy cluster scaling relations
• The KBC void and Hubble tension contradict $\Lambda$CDM on a Gpc scale $-$ Milgromian dynamics as a possible solution
• Hints of a Local Matter Underdensity or Modified Gravity in the Low $z$ Pantheon data
• Early-Universe-Physics Insensitive and Uncalibrated Cosmic Standards: Constraints on ${\Omega }_{\mathrm{m}}$ and Implications for the Hubble Tension
• Observational evidence for a local underdensity in the Universe and its effect on the measurement of the Hubble Constant
• A simultaneous solution to the Hubble tension and observed bulk flow within 250 $h^{-1}$ Mpc
• The Local Hole: a galaxy under-density covering 90% of sky to ~200 Mpc
• A model independent comparison of supernova and strong lensing cosmography: implications for the Hubble constant tension
• The redshift dependence of the inferred $H_0$ in a local void solution to the Hubble tension
• Cosmological signatures of torsion and how to distinguish torsion from the dark sector
• Towards Accurate Field-Level Inference of Massive Cosmic Structures
• Galaxy flows within 8,000 km/s from Numerical Action methods
• Constraints on the minimally extended varying speed of light model using the Pantheon+ dataset
• Testing the local supervoid solution to the Hubble tension with direct distance tracers
• Gas of thin tubes of massless scalar field as a possible model of unified dark fluid
• An effective $\mathbf{\Lambda }$-Szekeres modelling of the local Universe with Cosmicflows-4