Vlba continuum observations of ngc 4258: constraints on an advection-dominated accretion flow

Feb, 1998
11 pages
Published in:
  • Astrophys.J.Lett. 497 (1998) L69
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Abstract: (arXiv)
We report a 3 sigma upper limit of 220 microJanskys on any 22-GHz continuum emission coincident with the central engine in NGC 4258. If NGC 4258 is powered by an advection-dominated accretion flow, this radio upper limit implies that the inner advection-dominated flow cannot extend significantly beyond about 100 Schwarzschild radii.