SIMBAD references

We estimate the accretion rate M{dot} onto the black hole in the nucleus of NGC 4258. The result is model dependent. We find that a thin disk that is flat out to ≳2x10³GM/c² (M≡black hole mass) and that has inclination equal to that of the masing disk must have M{dot}≃0.01 M_☉.yr^–1 for consistency with near-infrared data. A thin disk that is warped at ∼10³GM/c² requires M{dot}≳1.5x10^–4 M_☉.yr^–1 for consistency with near-infrared data. Reasonable warp models and the near-infrared data are not consistent with M{dot} as low as the 7x10^–5α M_☉.yr^–1 proposed by Neufeld & Maloney. An advection-dominated flow model combined with the X-ray data implies M{dot}≃0.01 M_☉.yr^–1. Consistency with a tight 22 GHz upper limit on the flux from the central source requires a transition radius of ~(10-100)GM/c², although the 22 GHz upper limit may be relaxed by appeal to free-free absorption. Physical conditions in the observed VLBI jet features can also be related to conditions in the inner accretion flow. We conclude with a list of observations that might further constrain M{dot}.