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Cited by 33Astrophysical Phenomena and ObservationsAstrophysics and Star Formation StudiesAstrophysics and Cosmic Phenomena

A Magnetic Field Connecting the Galactic Center Circumnuclear Disk with Streamers and Mini-spiral: Implications from 850 μm Polarization Data

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Hsieh, Pei-Ying, Koch, Patrick M., Kim, Woong-Tae, Ho, Paul T. P., Tang, Ya-Wen, Wang, Hsiang-Hsu·2018·The Astrophysical Journal
DOI 10.3847/1538-4357/aacb27
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Abstract

Utilizing James Clark Maxwell Telescope 850 μ m SCUPOL dust polarization data, we investigate the configuration of the magnetic (B) field in the circumnuclear disk (CND) of the Galactic center. The SCUPOL data show a highly improved polarization coverage and resolution compared with earlier 100 μ m observations. The 850 μ m data have a resolution and coverage similar to previous 350 μ m polarimetry data. However, with a proper sampling on a 10″ grid, we find that the 850 μ m data trace the morphological structures of the CND substantially better. Furthermore, because the 850 μ m trace the field deeper into the material near SgrA*, they represent the highest-resolution submillimeter probe to date of the CND magnetic field. The observed B-field morphology is well described by a self-similar axisymmetric disk model where the radial infall velocity is one-quarter of the rotational velocity. A detailed comparison with higher-resolution interferometric maps from the Submillimeter Array further reveals that the B-field aligns with the neutral gas streamers connecting to the CND. Moreover, the innermost observed B-field structure also appears to trace and align with the mini-spiral located inside the CND. This suggests that there is one underlying B-field structure that is connecting the CND with its streamers and the inner mini-spiral. An estimate of β Plasma ≲ 1—based on the global B-field morphology that constrains the azimuthal-to-vertical field strength ratio of around 40 combined with a measurement of the azimuthal velocity indicates that the B-field appears dynamically significant toward the CND and also onwards to the inner mini-spiral.

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Crossref · 10.3847/1538-4357/aacb27

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69 of 69 references verified0 citation errors · 0 not checkable

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  • There is some evidence of molecular filaments connecting the CND to a molecular cloud at ~20 pc away, suggesting the CND could have formed during a close passage of such a cloud.

    “There is some evidence of molecular filaments connecting the CND to a molecular cloud at ∼ 20 pc away, suggesting that the CND could have formed during a close passage of such a cloud (Hsieh et al. 2017, 2018).”

    From The Fermi/eROSITA bubbles: a look into the nuclear outflow from the Milky Way (2024) · cites this paper as Hsieh et al. 2018

    Section 2.1 (page unavailable) reports streamers surrounding and feeding the CND, supporting evidence of a connection. It does not say that they connect the CND to a molecular cloud roughly 20 pc away, or that the CND formed during a close passage of such a cloud; Section 1.1 says the CND’s origin remains unclear. (LLM, conf=0.86)

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Research works printed but not linked: 1

  1. Lazarian, A. 2000, in ASP Conf. Ser. 215, Cosmic Evolution and Galaxy Formation: Structure, Interactions, and Feedback, ed. J. Franco et al. (San Francisco, CA: ASP), 69

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Authors
Hsieh, P.-Y., Koch, P. M., Kim, W.-T., Ho, P. T. P., Tang, Y.-W., & Wang, H.-H.
Affiliations
  • Institute of Astronomy and Astrophysics, Academia Sinica (TW)
  • Seoul National University (KR)
  • Chinese University of Hong Kong (HK)
Corresponding author
Hsieh, Pei-Ying
ORCID
Venue
The Astrophysical Journal
Publisher
American Astronomical Society
Published
2018-08-01
Volume
862
Issue
2
Pages
150
ISSN
  • 0004-637X (ISSN-L)
  • 1538-4357
DOI
10.3847/1538-4357/aacb27
OpenAlex
W2806975000
Cited by
33
References
69
Citations by year
2026: 5 · 2025: 6 · 2024: 6 · 2023: 5 · 2022: 4 · 2021: 4 · 2020: 2 · 2019: 1
FWCI
0.94
Type
journal article
Language
en
Open access
Licence
Locations
  • The Astrophysical Journal (publishedVersion, cc-by)
  • arXiv (Cornell University) (submittedVersion)
  • arXiv (Cornell University) (cc-by)
Topics
  • Physical Sciences › Physics and Astronomy › Astronomy and Astrophysics › Astrophysical Phenomena and Observations
  • 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
Keywords
Galactic Center, circumnuclear disk, magnetic field, dust polarization, Sgr A*, plasma beta, submillimeter polarimetry

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