Color Dependence of Dipole in CatWISE2020 Data
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arXiv
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| Format: | Preprint |
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2024
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| _version_ | 1866929359693021184 |
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| author | Panwar, Mohit Jain, Pankaj Omar, Amitesh |
| author_facet | Panwar, Mohit Jain, Pankaj Omar, Amitesh |
| contents | 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, $1.1>W1-W2\ge 0.8$ 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 $900\pm 113$ Kms$^{-1}$, which deviates from the CMB dipole velocity with approximately $4.7$ sigma significance. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2405_16853 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Color Dependence of Dipole in CatWISE2020 Data Panwar, Mohit Jain, Pankaj Omar, Amitesh Cosmology and Nongalactic Astrophysics 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, $1.1>W1-W2\ge 0.8$ 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 $900\pm 113$ Kms$^{-1}$, which deviates from the CMB dipole velocity with approximately $4.7$ sigma significance. |
| title | Color Dependence of Dipole in CatWISE2020 Data |
| topic | Cosmology and Nongalactic Astrophysics |
| url | https://arxiv.org/abs/2405.16853 |