期刊
ASTRONOMY & ASTROPHYSICS
卷 657, 期 -, 页码 -出版社
EDP SCIENCES S A
DOI: 10.1051/0004-6361/202140486
关键词
Galaxy; general; ISM; magnetic fields; ISM; structure; Galaxy; structure
资金
- European Research Council (ERC) under the European Union [772663]
- Commonwealth of Australia
- Natural Sciences and Engineering Research Council of Canada (NSERC) [2019-04848, RGPIN-2015-05948]
- Natural Sciences and Engineering Research Council of Canada
- National Research Council of Canada
- 6.1 Base funding
- ERC Starting Grant DRANOEL [714245]
- NAOJ Fellowship
- JSPS KAKENHI [18K13586, 20K14527]
- US National Science Foundation [AST-0321309, AST-0540690, AST-0838268]
- David Dunlap family
- University of Toronto
- Canada Research Chairs program
- Canada Foundation for Innovation 2017 Innovation Fund [35999]
- CNRS-INSU, France
- Observatoire de Paris, France
- Universite d'Orleans, France
- BMBF, Germany
- MIWF-NRW, Germany
- MPG, Germany
- Science Foundation Ireland (SFI), Ireland
- Department of Business, Enterprise and Innovation (DBEI), Ireland
- NWO, The Netherlands
- Science and Technology Facilities Council, UK
- Ministry of Science and Higher Education, Poland
- Istituto Nazionale di Astrofisica (INAF), Italy
- SURF Cooperative [e-infra 180169]
- LOFAR e-infra group
- Gauss Centre for Supercomputing e.V. through the John von Neumann Institute for Computing (NIC) [CHTB00]
- STFC [ST/P000096/1]
- INAF
- Physics Department of Turin university at the C3S Supercomputing Centre, Italy
- Consorzio Interuniversitario per la Fisica Spaziale
- European Research Council (ERC) [714245] Funding Source: European Research Council (ERC)
This work updates the reconstruction of the Galactic Faraday rotation sky using the latest Faraday rotation data sets. The results show a thinner and more pronounced Galactic disc with small-scale structures exceeding several thousand rad m(-2). The improved resolution and handling of noisy and incomplete data contribute to these findings.
Aims. This work provides an update to existing reconstructions of the Galactic Faraday rotation sky by processing almost all Faraday rotation data sets available at the end of the year 2020. Observations of extra-Galactic sources in recent years have further illuminated the previously underconstrained southern celestial sky, as well as parts of the inner disc of the Milky Way, along with other regions. This has culminated in an all-sky data set of 55 190 data points, thereby comprising a significant expansion on the 41 330 used in previous works. At the same time, this novelty makes an updated separation of the Galactic component a promising enterprise. The increased source density allows us to present our results in a resolution of about 1.3 x 10(-2) deg(2) (46.8 arcmin(2)), which is a twofold increase compared to previous works. Methods. As for previous Faraday rotation sky reconstructions, this work is based on information field theory, namely, a Bayesian inference scheme for field-like quantities that handles noisy and incomplete data. Results. In contrast to previous reconstructions, we find a significantly thinner and pronounced Galactic disc with small-scale structures exceeding values of several thousand rad m(-2). The improvements can mainly be attributed to the new catalog of Faraday data, but are also supported by advances in correlation structure modeling within numerical information field theory. We also provide a detailed discussion on the statistical properties of the Faraday rotation sky and we investigate correlations with other data sets.
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