Probing Magnetic Fields in Protostars with near-IR Polarimetry
9
Probing Magnetic Fields in Protostars with near-IR Polarimetry Barbara Whitney University of Wisconsin-Madison
description
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. - PowerPoint PPT Presentation
Transcript of Probing Magnetic Fields in Protostars with near-IR Polarimetry
![Page 1: Probing Magnetic Fields in Protostars with near-IR Polarimetry](https://reader036.fdocuments.us/reader036/viewer/2022062410/56816350550346895dd3f00e/html5/thumbnails/1.jpg)
Probing Magnetic Fields in Protostars with near-IR Polarimetry
Barbara Whitney
University of Wisconsin-Madison
![Page 2: Probing Magnetic Fields in Protostars with near-IR Polarimetry](https://reader036.fdocuments.us/reader036/viewer/2022062410/56816350550346895dd3f00e/html5/thumbnails/2.jpg)
High-Resolution Observations (IRAS 04302+2247)
Data from Lucas & Roche (1997)
K-bandd = 140 pc0.3” resolution
![Page 3: Probing Magnetic Fields in Protostars with near-IR Polarimetry](https://reader036.fdocuments.us/reader036/viewer/2022062410/56816350550346895dd3f00e/html5/thumbnails/3.jpg)
Model for IRAS 04302+2247
Whitney & Wolff (2002)
K-bandd = 140 pc0.3” resolution
![Page 4: Probing Magnetic Fields in Protostars with near-IR Polarimetry](https://reader036.fdocuments.us/reader036/viewer/2022062410/56816350550346895dd3f00e/html5/thumbnails/4.jpg)
K-band polarization maps, no B-field
Pl = -6.9% PV = 0Integrated polarization:
![Page 5: Probing Magnetic Fields in Protostars with near-IR Polarimetry](https://reader036.fdocuments.us/reader036/viewer/2022062410/56816350550346895dd3f00e/html5/thumbnails/5.jpg)
Axial field (along z)
Pl = +2.7% PV = 0Integrated:
Whitney & Wolff 2002
![Page 6: Probing Magnetic Fields in Protostars with near-IR Polarimetry](https://reader036.fdocuments.us/reader036/viewer/2022062410/56816350550346895dd3f00e/html5/thumbnails/6.jpg)
Galli-Shu + toroid field
Bj = exp[-z/a](Br2 + Bq
2)1/2
![Page 7: Probing Magnetic Fields in Protostars with near-IR Polarimetry](https://reader036.fdocuments.us/reader036/viewer/2022062410/56816350550346895dd3f00e/html5/thumbnails/7.jpg)
V = 6%Pl = Q = -8%
Galli-Shu + toroid field
Integrated:
![Page 8: Probing Magnetic Fields in Protostars with near-IR Polarimetry](https://reader036.fdocuments.us/reader036/viewer/2022062410/56816350550346895dd3f00e/html5/thumbnails/8.jpg)
Galli-Shu + toroid field
Bj = exp[-z/a](b rcyl)-1.5 (Br2 + Bq
2)1/2
![Page 9: Probing Magnetic Fields in Protostars with near-IR Polarimetry](https://reader036.fdocuments.us/reader036/viewer/2022062410/56816350550346895dd3f00e/html5/thumbnails/9.jpg)
V = 3%Pl = Q = -16%
Galli-Shu + toroid field
Integrated: