Accretion Rates onto Massive Black Holes in Four Quiescent Elliptical Galaxies

Abstract

Four quiescent elliptical galaxies were imaged with the NRAO VLA at 8.5 GHz. Within the context of canonical advection-dominated accretion flows (ADAFs), these VLA images plus published black hole masses constrain the accretion rates to be $<1.6\times 10^{-4}$, $<3.6\times 10^{-4}$, $\le 7.8\times 10^{-4}$, and $\le 7.4\times 10^{-4}$ of the Eddington rates. These ADAF accretion rates derived at 8.5 GHz have important implications for the levels of soft and hard X-rays expected from these quiescent galaxies.

with 1 figure, accepted to the Astrophysical Journal Letters

References in corpus (1)

• Low radiative efficiency accretion in the nuclei of elliptical galaxies

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