Testing black hole unification: simultaneous radio and X-ray observations of NGC 7213

Physics

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Extragalactic, Atca

Scientific paper

We are proposing to monitor the hard state low luminosity AGN NGC 7213 throughout semester 2008OCTS, contemporaneously with regular intensive observations in the X-ray band with RXTE. Our primary goal for the entire campaign is to see if an individual AGN can be established to follow the radio:X-ray correlation - with slope +0.6 - which has been established for X-ray binaries, and whose presence in AGN is implied by the recent discovery of 'fundamental planes' of black hole activity. Currently no AGN has been established to show such a correlation, leaving a key piece of the arguments for scale-free 'grand unification' of black holes of all masses untested. This is a unique opportunity to test this paradigm. Our results to date show a strong radio/X-ray correlation but with a significantly shorter lag than expected, so we speculate that we may be seeing beamed emission from the jet in a 'mini-blazar' configuration. We propose to test this idea this semester with continued monitoring to further constrain the lag and sample radio fluxes corresponding to the widest range of X-ray fluxes yet observed in this source.

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