Color Dependence of Dipole in CatWISE2020 Data

2024/05/27 by Mohit Panwar, Pankaj Jain, Panwar, Mohit +3 · 1 citation
Engineering · Physics and Astronomy · #Astronomical Observations and Instrumentation #Cosmology and Nongalactic Astrophysics (astro-ph.CO) #FOS: Physical sciences #Gamma-ray bursts and supernovae #Stellar, planetary, and galactic studies

paper · pdf · doi:10.48550/arxiv.2405.16853

openalex publication_date 2024/05/27 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28

Abstract

The signal of dipole anisotropy in quasar number counts is studied using the CatWISE2020 catalog in various color bins. It is found that the dipole signal differs significantly in two color bins, namely, 1.1>W1-W2≥ 0.8 and 1.4>W1-W2>1.1. The color bin 1.4>W1-W2>1.1 appears strongly contaminated, with possibly Galactic contributions and is unreliable for extracting the signal of cosmological dipole. The source of this contamination has not been identified and cannot be attributed to known emissions within the galaxy. Removing this contaminated color bin leads to a strong dipole signal with a direction significantly different from that obtained from full data. If we interpret this dipole as due to our local motion, the extracted velocity turns out to be 900± 113 Kms^-1, which deviates from the CMB dipole velocity with approximately 4.7 sigma significance.

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