High redshift radio galaxies and divergence from the CMB dipole

Abstract

Previous studies have found our velocity in the rest frame of radio galaxies at high redshift to be substantially larger than that inferred from the CMB temperature dipole anisotropy. We construct a full sky catalogue NVSUMSS, by merging the NVSS and SUMSS catalogues and removing local sources by various means including cross-correlating with the 2MRS catalogue. We take into account both aberration and Doppler boost to deduce our velocity from the hemispherical number count asymmetry, as well as via a 3-dimensional linear estimator. Both the magnitude and direction depend on cuts made to the catalogue, e.g. on the lowest source flux, however these effects are small. With the hemispheric number count asymmetry method we obtain a velocity of 1729 $\pm$ 187 km/s i.e. about 4 times larger than that obtained from the CMB dipole, but close in direction, towards RA=149 $\pm$ 2 degree, DEC = -17 $\pm$ 12 degree. With the 3-dimensional estimator, the derived velocity is 1355 $\pm$ 174 km/s towards RA=141 $\pm$ 11 degree, DEC=-9 $\pm$ 10 degree. We assess the statistical significance of these results by constructing catalogues of random distributions and show that they are at best significant at the $2.81\sigma$ (99.95% confidence) level.

13 pages, 12 figures, 10 tables; matches published version

References in corpus (6)

• Correlation of CMB with large-scale structure: I. ISW Tomography and Cosmological Implications
• Dipoles in the Sky
• Radio galaxies of the local universe: all-sky catalog, luminosity functions, and clustering
• Detecting the Cosmic Dipole Anisotropy in Large-Scale Radio Surveys
• Large-scale Cosmic Flows from Cosmicflows-2 Catalog
• Aberration of the Cosmic Microwave Background

Cited by in corpus (94)

• Challenges for $\Lambda$CDM: An update
• Cosmology with Phase 1 of the Square Kilometre Array; Red Book 2018: Technical specifications and performance forecasts
• The CosmoVerse White Paper: Addressing observational tensions in cosmology with systematics and fundamental physics
• A Test of the Cosmological Principle with Quasars
• Is the Observable Universe Consistent with the Cosmological Principle?
• Probing cosmic isotropy with a new X-ray galaxy cluster sample through the $L_{\text{X}}-T$ scaling relation
• Does Hubble Tension Signal a Breakdown in FLRW Cosmology?
• A Challenge to the Standard Cosmological Model
• Probing the Cosmological Principle in the counts of radio galaxies at different frequencies
• Cosmological implications of the anisotropy of ten galaxy cluster scaling relations
• Hints of FLRW Breakdown from Supernovae
• The Cosmic Radio Dipole: Estimators and Frequency Dependence
• The Science of the Einstein Telescope
• On Larger $H_0$ Values in the CMB Dipole Direction
• Anomalies in Physical Cosmology
• Testing the Cosmological Principle with CatWISE Quasars: A Bayesian Analysis of the Number-Count Dipole
• On the kinematic cosmic dipole tension
• A new way to test the Cosmological Principle: measuring our peculiar velocity and the large scale anisotropy independently
• Is there really a Hubble tension?
• A large disparity in cosmic reference frames determined from the sky distributions of radio sources and the microwave background radiation
• The cosmic radio dipole: Bayesian estimators on new and old radio surveys
• Isotropy of low redshift type Ia Supernovae: A Bayesian analysis
• Measuring the scale of cosmic homogeneity with SDSS-IV DR14 quasars
• Do supernovae indicate an accelerating universe?
• Large angular scale multipoles at redshift ~0.8
• Cosmology Intertwined: A Review of the Particle Physics, Astrophysics, and Cosmology Associated with the Cosmological Tensions and Anomalies
• Testing the standard model of cosmology with the SKA: the cosmic radio dipole
• Testing cosmic anisotropy with Pantheon sample and quasars at high redshifts
• The dipole anisotropy of AllWISE galaxies
• Theoretical systematics in testing the Cosmological Principle with the kinematic quasar dipole
• The multipole expansion of the local expansion rate
• Peculiar motion of Solar system from the Hubble diagram of supernovae Ia and its implications for cosmology
• Excitation of gravitational wave modes by a center-of-mass velocity of the source
• The Cosmic Dipole in the Quaia Sample of Quasars: A Bayesian Analysis
• Exciting modes due to the aberration of gravitational waves: Measurability for extreme-mass-ratio inspirals
• The deceleration parameter in `tilted' universes: generalising the Friedmann background
• Testing the Cosmological Principle in the radio sky
• Detection and estimation of the cosmic dipole with the Einstein Telescope and Cosmic Explorer
• Discordance of dipole asymmetries seen in recent large radio surveys with the Cosmological Principle
• Cosmography of the Local Universe by Multipole Analysis of the Expansion Rate Fluctuation Field
• Evidence of isotropy at large-scale from polarizations of radio sources
• The dipole anisotropy of WISE x SuperCOSMOS number counts
• Generalisation of the Kaiser Rocket effect in general relativity in the wide-angle galaxy 2-point correlation function
• Supernovae anisotropy power spectrum
• Superhorizon perturbations: A possible explanation of the Hubble--Lemaître Tension and the Large Scale Anisotropy of the Universe
• Measuring our velocity from fluctuations in number counts
• Explaining Excess Dipole in NVSS Data Using Superhorizon Perturbation
• Moving gravitational wave sources at cosmological distances: Impact on the measurement of the Hubble constant
• Measuring kinematic anisotropies with pulsar timing arrays
• The galaxy power spectrum from TGSS ADR1 and the effect of flux calibration systematics
• Reassessment of the dipole in the distribution of quasars on the sky
• Tomographic redshift dipole: Testing the cosmological principle
• Bianchi IX gravitational collapse of matter inhomogeneities
• A modified Friedmann equation for a system with varying gravitational mass
• Galaxy power spectrum and biasing results from the LOFAR Two-metre Sky Survey (first data release)
• Local patch analysis for testing statistical isotropy of the Planck convergence map
• A cross-correlation analysis of CMB lensing and radio galaxy maps
• The low multipoles in the Pantheon+SH0ES data
• The kinematic contribution to the cosmic number count dipole
• A study of Dipolar Signal in distant Quasars with various observables
• Cosmic dipoles of active galactic nuclei at optical and radio wavelengths display much larger amplitudes than the cosmic microwave background dipole
• Resolution of the incongruency of dipole asymmetries within various large radio surveys -- implications for the Cosmological Principle
• Euclid: Testing the Copernican principle with next-generation surveys
• Testing the Cosmological Principle: On the Time Dilation of Distant Sources
• Cosmic dipole tensions: confronting the cosmic microwave background with infrared and radio populations of cosmological sources
• Expanding covariant cosmography of the local Universe: incorporating the snap and axial symmetry
• Forty years of the Ellis-Baldwin test
• Probing the Cosmological Principle with the CSST Photometric Survey
• Astrophysics with the Laser Interferometer Space Antenna
• The MeerKAT Absorption Line Survey: Homogeneous continuum catalogues towards a measurement of the cosmic radio dipole
• Combining chirp mass, luminosity distance and sky localisation from gravitational wave events to detect the cosmic dipole
• Clustering properties of the CatWISE2020 quasar catalogue and their impact on the cosmic dipole anomaly
• Cosmological inference from within the peculiar local universe
• The cosmic aberration drift: proposal for a real-time detection of our acceleration through space
• Probing Cosmology beyond $\Lambda$CDM using the SKA
• The impact of large-scale galaxy clustering on the variance of the Hellings-Downs correlation: numerical results
• Role of internal space correlations in the dynamics of a higher-dimensional Bianchi type-I universe: shear scalar and Hubble parameter perspectives
• Fast and spurious: a robust determination of our peculiar velocity with future galaxy surveys
• Predictions for the diffuse cosmic dipole at radio frequencies from reionization imprints
• Solar system peculiar motion from the Hubble diagram of quasars and testing the Cosmological Principle
• Linear Relativistic Corrections in the Spherical Fourier-Bessel Power Spectrum
• Measuring cosmic dipole with the GRB luminosity-time relation
• The kinematic cosmic dipole beyond Ellis and Baldwin
• Solar peculiar motion inferred from dipole anisotropy in redshift distribution of quasars appears to lie along the Galactic Centre direction
• Exploring the cosmic microwave background dipole direction using gamma-ray bursts
• Clustering properties of TGSS radio sources
• The Ellis and Baldwin test of the Cosmic Dipole: Exploring the impact of multiple flux density cuts
• Weak Lensing Low Multipoles
• Detector induced anisotropies on the angular distribution of gravitational wave sources and opportunities of constraining horizon scale anisotropies
• Galaxy number-count dipole and superhorizon fluctuations
• Our Peculiar Motion Inferred from Number Counts of Mid Infra Red AGNs and the Discordance Seen with the Cosmological Principle
• The effects of lensing by local structures on the dipole of radio source counts
• Addressing Dipole Tension via Clustering in $\Lambda$CDM and beyond
• First constraints on the intrinsic CMB dipole and our velocity with Doppler and aberration