An Independent Measure of the Kinematic Dipole from SDSS

Abstract

We utilize the Sloan Digital Sky Survey (SDSS) extended Baryon Oscillation Spectroscopic Survey (eBOSS) and Baryon Oscillation Spectroscopic Survey (BOSS) catalogs with precise spectroscopic redshifts to estimate the kinematic redshift dipole caused by the proper motion of the Solar system. We find that the velocity extracted from the kinematic dipole is consistent with Cosmic Microwave Background inferred values. Although the small sky coverage and limited number density of the SDSS sources constrain us from obtaining precise and robust measurements, we leverage the redshift dipole method to estimate the kinematic dipole. The velocity measurements in this study are insensitive to intrinsic clustering, associated with the source count dipole. The kinematic dipole measured in this work and its consistency with CMB values do not guarantee isotropy at large scales. The anisotropy (excess dipole) measured with the NRAO VLA Sky Survey (NVSS) and the WISE Catalog (CatWISE) could be due to the intrinsic distribution of galaxies. The results in this work focus solely on the kinematic dipole term.

Footnotes 5, 6, and 7 were added post-acceptance to the journal version for clarification, in response to comments and questions from peers and colleagues

References in corpus (23)

• Five-Year Wilkinson Microwave Anisotropy Probe (WMAP) Observations: Data Processing, Sky Maps, and Basic Results
• Challenges for $\Lambda$CDM: An update
• A Test of the Cosmological Principle with Quasars
• Is the Observable Universe Consistent with the Cosmological Principle?
• The Completed SDSS-IV extended Baryon Oscillation Spectroscopic Survey: Large-scale Structure Catalogs for Cosmological Analysis
• A Challenge to the Standard Cosmological Model
• Dipoles in the Sky
• Analyzing the Large-Scale Bulk Flow using CosmicFlows4: Increasing Tension with the Standard Cosmological Model
• The Cosmic Radio Dipole: Estimators and Frequency Dependence
• Anomalies in Physical Cosmology
• Testing the Cosmological Principle with CatWISE Quasars: A Bayesian Analysis of the Number-Count Dipole
• A new way to test the Cosmological Principle: measuring our peculiar velocity and the large scale anisotropy independently
• Inference of the cosmic rest-frame from supernovae Ia
• The cosmic radio dipole: Bayesian estimators on new and old radio surveys
• The kinematic dipole in galaxy redshift surveys
• Large angular scale multipoles at redshift ~0.8
• Theoretical systematics in testing the Cosmological Principle with the kinematic quasar dipole
• Search for Large-scale Anisotropy on Arrival Directions of Ultra-high-energy Cosmic Rays Observed with the Telescope Array Experiment
• A study of Dipolar Signal in distant Quasars with various observables
• Resolution of the incongruency of dipole asymmetries within various large radio surveys -- implications for the Cosmological Principle
• Footprints of Doppler and Aberration Effects in CMB Experiments: Statistical and Cosmological Implications
• Testing the Cosmological Principle: On the Time Dilation of Distant Sources
• A mechanism to explain Galaxy alignment over a range of scales

Cited by in corpus (4)

• Reassessment of the dipole in the distribution of quasars on the sky
• The kinematic contribution to the cosmic number count dipole
• Measuring peculiar velocity and tomographic redshift dipole with DESI DR1 catalogs
• Cosmic Dipoles from Large-Scale Structure Surveys