We present the results of a \sim 3 year campaign to monitor the low luminosity active galactic nucleus ( LLAGN ) NGC 7213 in the radio ( 4.8 and 8.4 GHz ) and X-ray bands ( 2-10 keV ) .
With a reported X-ray Eddington ratio of 7 \times 10 ^ { -4 } L _ { Edd } , NGC 7213 can be considered to be comparable to a hard state black hole X-ray binary .
We show that a weak correlation exists between the X-ray and radio light curves .
We use the cross-correlation function to calculate a global time lag between events in the X-ray and radio bands to be 24 \pm 12 days lag ( 8.4 GHz radio lagging X-ray ) , and 40 \pm 13 days lag ( 4.8 GHz radio lagging X-ray ) .
The radio-radio light curves are extremely well correlated with a lag of 20.5 \pm 12.9 days ( 4.8 GHz lagging 8.4 GHz ) .
We explore the previously established scaling relationship between core radio and X-ray luminosities and black hole mass L _ { R } \propto M ^ { 0.6 - 0.8 } L _ { X } ^ { 0.6 } , known as the ‘ fundamental plane of black hole activity ’ , and show that NGC 7213 lies very close to the best-fit ‘ global ’ correlation for the plane as one of the most luminous LLAGN .
With a large number of quasi-simultaneous radio and X-ray observations , we explore for the first time the variations of a single AGN with respect to the fundamental plane .
Although the average radio and X-ray luminosities for NGC 7213 are in good agreement with the plane , we show that there is intrinsic scatter with respect to the plane for the individual data points .