The Magnetic Field Strength in the Wall of the Local Bubble toward l, b ~ 300°, 0°

Details The Magnetic Field Strength in the Wall of the Local Bubble toward l, b ~ 300°, 0° The Magnetic Field Strength in the Wall of the Local Bubble toward l, b ~ 300°, 0°

Mar 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006apj...640l..51a&link_type=abstract

The Astrophysical Journal, Volume 640, Issue 1, pp. L51-L54.

Astronomy and Astrophysics

Astronomy

12

Ism: Individual: Name: Local Bubble, Magnetic Fields, Polarization

Scientific paper

We present polarization measurements in the region around l, b = 300°, 0°, toward stars with well-determined distances, primarily in the range 40-200 pc. We argue that these observations trace polarization caused by dust in the wall of the Local Bubble (LB). Using a Chandrasekhar-Fermi analysis, we derive a plane-of-the-sky magnetic field strength, in the wall of the LB in this direction, of ⊥>=8+5-3 μG, equivalent to a magnetic pressure of PB/k~1.8×104 K cm-3. This pressure equals, to within the uncertainties, that in the bubble interior, as derived from EUVE observations, assuming collisional ionization equilibrium. Such a magnetic field could help us explain the observed low O VI column density associated with the LB wall.

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