SKA-Mid/Low plus VLBI should enable Zeeman and broadband RM measurements of AGN circumnuclear magnetic fields from ~100 pc disks down to sub-pc scales that current instruments largely cannot reach.
A Thin HI Circumnuclear Disk in NGC4261
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abstract
We report on high sensitivity, spectral line VLBI observations of the HI absorption feature in the radio galaxy NGC4261. Although absorption is only detectable on the most sensitive baseline, it can be unambiguously associated with the counterjet and is interpreted to originate in a thin atomic circumnuclear disk. This structure is probably a continuation of the dusty accretion disk inferred from HST imaging, which could be feeding the massive black hole. HI column densities in front of the counterjet of the order of 10^{21}(T_sp/100 K) cm^{-2} are derived, consistent with X-ray data and VLBI scale free-free absorption. The data presented here are the result of the first scientific project processed on the new EVN MkIV data processor.
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Measurements of magnetic fields in circumnuclear matter with the SKA telescopes
SKA-Mid/Low plus VLBI should enable Zeeman and broadband RM measurements of AGN circumnuclear magnetic fields from ~100 pc disks down to sub-pc scales that current instruments largely cannot reach.