Absolutely calibrated radio polarimetry of the inner Galaxy at 2.3 and 4.8 GHz
Open accessAbstract
We present high-sensitivity and absolutely calibrated images of diffuse radio polarization at a resolution of about 10 arcmin covering the range 10° < l < 34° and |b| < 5° at 2.3 GHz from the S-band Polarization All Sky Survey and at 4.8 GHz from the Sino-German λ6 cm polarization survey of the Galactic plane. Strong depolarization near the Galactic plane is seen at 2.3 GHz, which correlates with strong Hα emission. We ascribe the depolarization to spatial Faraday rotation measure fluctuations of about 65 rad m−2 on scales smaller than 6–9 pc. We argue that most (about 90 per cent) of the polarized emission seen at 4.8 GHz originates from a distance of 3–4 kpc in the Scutum arm and that the random magnetic field dominates the regular field there. A branch extending from the North Polar Spur towards lower latitudes can be identified from the polarization image at 4.8 GHz but only partly from the polarization image at 2.3 GHz, implying that the branch is at a distance larger than 2–3 kpc. We show that comparison of structure functions of complex polarized intensity with those of polarized intensity can indicate whether the observed polarized structures are intrinsic or caused by Faraday screens. The probability distribution function of gradients from the polarization images at 2.3 GHz indicates that the turbulence in the warm ionized medium is transonic.
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Sun et al. concluded that the depolarization implies that the radio emission is coming from a distance ≳2 kpc, at least toward b≲40°.
“Based on the polarization data, (Sun et al. 2014, 2015) concluded that the depolarization implies that the radio emission is coming from a distance ≳ 2 kpc, at least toward b ≲ 40 ◦ .”
From The Fermi/eROSITA bubbles: a look into the nuclear outflow from the Milky Way (2024) · cites this paper as Sun et al. 2014
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Crocker, R. M., Bicknell, G. V., Taylor, A. M., & Carretti, E. (2015) · The Astrophysical Journal · doi:10.1088/0004-637x/808/2/107 · Cited by 120 · see citing works
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Self-citationThe Fermi/eROSITA bubbles: a look into the nuclear outflow from the Milky Way
Sarkar, K. C. (2024) · The Astronomy and Astrophysics Review · doi:10.1007/s00159-024-00152-1 · Cited by 34 · see citing works
On the distance to the North Polar Spur and the local CO-H<sub>2</sub>factor
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- Authors
- Sun, X. H., Gaensler, B. M., Carretti, E., Purcell, C. R., Staveley-Smith, L., Bernardi, G., & Haverkorn, M.
- Affiliations
- The University of Sydney (AU)
- Commonwealth Scientific and Industrial Research Organisation (AU)
- Rhodes University (ZA)
- Radboud University Nijmegen (NL)
- Venue
- Monthly Notices of the Royal Astronomical Society
- Publisher
- Oxford University Press (OUP)
- Published
- 2013-12-03
- Volume
- 437
- Issue
- 3
- Pages
- 2936-2947
- ISSN
- 0035-8711 (ISSN-L)
- 1365-2966
- OpenAlex
- W2163339116
- Cited by
- 30
- References
- 52
- Citations by year
- 2026: 1 · 2024: 1 · 2023: 2 · 2022: 1 · 2021: 1 · 2020: 1 · 2019: 3 · 2018: 6 · 2017: 3 · 2016: 5 · 2015: 6
- FWCI
- 1.98
- Type
- journal article
- Language
- en
- Open access
- Licence
- other-oa
- Locations
- Monthly Notices of the Royal Astronomical Society (publishedVersion)
- UWA Profiles and Research Repository (UWA) (publishedVersion, other-oa)
- arXiv (Cornell University) (submittedVersion)
- UWA Profiles and Research Repository (University of Western Australia) (submittedVersion, other-oa)
- Radboud Repository (Radboud University) (submittedVersion, other-oa)
- Radboud Repository (Radboud University) (submittedVersion)
- Funders
- Commonwealth Scientific and Industrial Research Organisation (CE110001020)
- Nederlandse Organisatie voor Wetenschappelijk Onderzoek (639.042.915)
- ARC Centre of Excellence for All-Sky Astrophysics (CE110001020)
- Australian Research Council (FL100100114)
- Topics
- Physical Sciences › Physics and Astronomy › Astronomy and Astrophysics › Astrophysics and Star Formation Studies
- Physical Sciences › Physics and Astronomy › Nuclear and High Energy Physics › Astrophysics and Cosmic Phenomena
- Physical Sciences › Physics and Astronomy › Astronomy and Astrophysics › Radio Astronomy Observations and Technology
- Keywords
- radio polarimetry, Galactic plane, depolarization, H-alpha emission, interstellar magnetic field, Scutum arm, North Polar Spur, warm ionized medium, structure functions, 2.3 GHz, 4.8 GHz
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