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Probing Magnetic Fields in Protostars with near-IR Polarimetry

Probing Magnetic Fields in Protostars with near-IR Polarimetry. Barbara Whitney University of Wisconsin-Madison. K-band d = 140 pc 0.3” resolution. High-Resolution Observations (IRAS 04302+2247). Data from Lucas & Roche (1997). K-band d = 140 pc 0.3” resolution.

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Probing Magnetic Fields in Protostars with near-IR Polarimetry

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  1. Probing Magnetic Fields in Protostarswith near-IR Polarimetry Barbara Whitney University of Wisconsin-Madison

  2. K-band d = 140 pc 0.3” resolution High-Resolution Observations (IRAS 04302+2247) Data from Lucas & Roche (1997)

  3. K-band d = 140 pc 0.3” resolution Model for IRAS 04302+2247 Whitney & Wolff (2002)

  4. K-band polarization maps, no B-field Integrated polarization: Pl = -6.9% PV = 0

  5. Axial field (along z) PV = 0 Integrated: Pl = +2.7% Whitney & Wolff 2002

  6. Galli-Shu + toroid field Bj = exp[-z/a](Br2 + Bq2)1/2

  7. Galli-Shu + toroid field Integrated: Pl = Q = -8% V = 6%

  8. Galli-Shu + toroid field Bj= exp[-z/a](b rcyl)-1.5 (Br2 + Bq2)1/2

  9. Galli-Shu + toroid field Integrated: Pl = Q = -16% V = 3%

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