Magnetic fields in cool clouds within the central 50 parsecs of the galaxy

David T. Chuss*, Jacqueline A. Davidson, Jessie L. Dotson, C. Darren Dowell, Roger H. Hildebrand, Giles Novak, John E. Vaillancourt

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

69 Scopus citations

Abstract

We report the detection of polarized emission in the vicinity of the Galactic center for 158 positions within eight different pointings of the Hertz polarimeter operating on the Caltech Submillimeter Observatory. These pointings include locations 2′ offset to the east, northeast, and northwest of M-0.02-0.07; locations to the southeast and northwest of the 20 km s -1 cloud (M-0.13-0.08); CO 0.02-0.02, M0.07-0.08; and M0.11-0.08. We use these data in conjunction with previous far-infrared and submillimeter polarization results to find that the direction of the inferred magnetic field is related to the density of the molecular material in the following way: in denser regions, the projected field is generally parallel to the Galactic plane, whereas in regions of lower density, the field is generally perpendicular to the plane. One possible explanation for this result is that an initially poloidal field has been sheared into a toroidal configuration in regions that are dense enough such that the gravitational energy density is greater than the energy density of the magnetic field. Another possibility is that winds due to supernovae in the central molecular zone are responsible for deviations from a toroidal field outside of the densest molecular regions.

Original languageEnglish (US)
Pages (from-to)1116-1128
Number of pages13
JournalAstrophysical Journal
Volume599
Issue number2 I
DOIs
StatePublished - Dec 20 2003

Keywords

  • Dust, extinction
  • Galaxy: center
  • ISM: magnetic fields
  • Submillimeter
  • Techniques: polarimetric

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

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