VLBA Continuum Observations of NGC 4258: Constraints on an Advection-Dominated Accretion Flow

Details VLBA Continuum Observations of NGC 4258: Constraints on an Advection-Dominated Accretion Flow VLBA Continuum Observations of NGC 4258: Constraints on an Advection-Dominated Accretion Flow

1998-02-20

arxiv.org/abs/astro-ph/9802264v1

Astronomy and Astrophysics

Astrophysics

11 pages, 1 figure, to be published in ApJ Letters

Scientific paper

10.1086/311284

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.

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