Mapping Magnetic Fields in Dust Clouds at the Galactic Center

Details Mapping Magnetic Fields in Dust Clouds at the Galactic Center Mapping Magnetic Fields in Dust Clouds at the Galactic Center

Dec 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001aas...19910903c&link_type=abstract

American Astronomical Society, 199th AAS Meeting, #109.03; Bulletin of the American Astronomical Society, Vol. 33, p.1474

Astronomy and Astrophysics

Astronomy

Scientific paper

SPARO, a 450\micron polarimeter operated at the South Pole, and Hertz, a 350\micron polarimeter operated at the Caltech Submillimeter Observatory(CSO) provide complimentary information concerning the inferred magnetic field direction in the dust component of the Galactic Center. SPARO's low angular resolution (5\arcmin) map of the Galactic Center shows a predominantly toroidal field which is expected from the shear effect of Galactic rotation. Hertz's higher resolution (20\arcsec) indicates that on smaller scales, the field is more complex and correlates with structures seen in mid-IR and radio continuum maps. These recent Hertz observations suggest that a diffuse component of submillimeter emission may be associated with this hotter structure. We have found that the polarization anti-correlates with the submillimeter flux, indicating a constant polarized flux (Px F). In this scenario, the dense clouds dilute polarization that is produced in a more extended and diffuse source.

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