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Line of Sight Magnetic Fields. Zeeman Effect. Z = B Z, Z 1 – 2 Hz/G, (Z H I = 1.4 Hz/G). V = LR (dI/d)( Z cos ) line of sight B Q or U (d 2 I/d 2 )( Z sin ) 2 plane of sky B (not really) (dI/d) Z I ( Z / FWHM ). Diffuse Cloud (H I Zeeman).
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Zeeman Effect Z = B Z, Z 1 – 2 Hz/G, (ZH I = 1.4 Hz/G) V = LR (dI/d)(Zcos) line of sight B Q or U (d2I/d2)(Zsin)2 plane of sky B (not really) (dI/d)Z I (Z/ FWHM)
Diffuse Cloud (H I Zeeman) Arecibo “Millennium” Survey I opacity profile CNM component (1 of 6) 3C 138 V opacity profile dI/dv Blos = 5.6 1.0 G Blos = 11 3.1 G
L1448 (OH Zeeman) Blos=28 6 µG Blos=25 5 µG
DR21OH (CN Zeeman) Blos = 0.4, 0.7 mG
W3OH (excited OH, maser Zeeman) 8-11 mG
Zeeman Effect Results Species (GHz) n(protons/cm-3 B H I 1.4 101-2 3-10 G OH (~thermal) 1.6 103-4 10-100 G CN 113.5 105-60.3-1 mG OH (masers) 1.6, 6.0, 13.4 107-8 1-10 mG H2O (masers) 22.2 109-10 10-100 mG