Parsec%20scale%20Rotation%20Measures%20in%20AGN

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Parsec scale Rotation Measures in AGN

• Bob Zavala
• NRAO/NMSU
• Greg Taylor
• NRAO

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RMs in3C 273

• Core RM variable

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5 parsecs
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3C 111
RM gradient 250 rad m-2 mas-1 core 0.8 _at_
15GHz
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3C 120

• Smooth RM in jet
• Core mi
• 8 GHz 1.5
• 12 GHz 8
• 15 GHz 5

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M87

• Slope change
• B field sign change
• No P lt 15 mas from
• core

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RM vs. mc
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RM vs. Redshift
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3C 279
4.5 year RM pol
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RMs in BL Lacs
1823568
BL Lac
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Summary

• RM time variable
• Faraday depth gradient
• Scale size 1 pc
• B 10 ?G
• BL Lacs jet RM ?quasars
• Helical fields need broad jets
• Highest RMs at high z

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3C 273
15-43 GHz