| Autor: |
Ari J. Cukierman, S. E. Clark, George Halal |
| Jazyk: |
angličtina |
| Rok vydání: |
2023 |
| Předmět: |
|
| Zdroj: |
The Astrophysical Journal, Vol 946, Iss 2, p 106 (2023) |
| Druh dokumentu: |
article |
| ISSN: |
1538-4357 |
| DOI: |
10.3847/1538-4357/acb0c4 |
| Popis: |
We present evidence for scale-independent misalignment of interstellar dust filaments and magnetic fields. We estimate the misalignment by comparing millimeter-wave dust-polarization measurements from Planck with filamentary structures identified in neutral-hydrogen (H i ) measurements from H i 4PI. We find that the misalignment angle displays a scale independence (harmonic coherence) for features larger than the H i 4PI beamwidth (16.′2). We additionally find a spatial coherence on angular scales of ${ \mathcal O }(1^\circ )$ . We present several misalignment estimators formed from the auto- and cross-spectra of dust-polarization and H i -based maps, and we also introduce a map-space estimator. Applied to large regions of the high-Galactic-latitude sky, we find a global misalignment angle of ∼2°, which is robust to a variety of masking choices. By dividing the sky into small regions, we show that the misalignment angle correlates with the parity-violating TB cross-spectrum measured in the Planck dust maps. The misalignment paradigm also predicts a dust EB signal, which is of relevance in the search for cosmic birefringence but as yet undetected; the measurements of EB are noisier than those of TB , and our correlations of EB with misalignment angle are found to be weaker and less robust to masking choices. We also introduce an H i -based dust-polarization template constructed from the Hessian matrix of the H i intensity, which is found to correlate more strongly than previous templates with Planck dust B modes. |
| Databáze: |
Directory of Open Access Journals |
| Externí odkaz: |
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