We report on the results of a simultaneous monitoring campaign employing eight Chandra X-ray ( 0.5–10 keV ) and six VLA/EVLA ( 8.4 GHz ) radio observations of NGC 4051 over seven months .
Evidence for compact jets is observed in the 8.4 GHz radio band ; This builds on mounting evidence that jet production may be prevalent even in radio-quiet Seyferts .
Assuming comparatively negligible local diffuse emission in the nucleus , the results also demonstrate an inverse correlation of L _ { \mathrm { radio } } \propto L _ { \mathrm { X - ray } } ^ { -0.72 \pm 0.04 } .
If the A configuration is excluded in the case that diffuse emission plays a significant role , the relation is still L _ { \mathrm { radio } } \propto L _ { \mathrm { X - ray } } ^ { -0.12 \pm 0.05 } .
Current research linking the mass of supermassive black holes and stellar-mass black holes in the “ low/hard ” state to X-ray luminosities and radio luminosities suggest a “ fundamental plane of accretion onto black holes ” that has a positive correlation of L _ { \mathrm { radio } } \propto L _ { \mathrm { X - ray } } ^ { 0.67 \pm 0.12 } .
Our simultaneous results differ from this relation by more than 11 \sigma ( 6 \sigma excluding the A configuration ) , indicating that a separate mode of accretion and ejection may operate in this system .
A review of the literature shows that the inverse correlation seen in NGC 4051 is seen in three other black hole systems , all of which accrete at near 10 % of their Eddington luminosity , perhaps suggesting a distinct mode of disk-jet coupling at high Eddington fractions .
We discuss our results in the context of disk and jets in black holes and accretion across the black hole mass scale .