Black hole mass measurements using ionized gas discs: systematic dust effects

Details Black hole mass measurements using ionized gas discs: systematic dust effects Black hole mass measurements using ionized gas discs: systematic dust effects

2008-09-08

arxiv.org/abs/0809.1432v1

Astronomy and Astrophysics

Astrophysics

4 pages, 2 figures, to appear in "Observational Evidence for Black Holes in the Universe", AIP Conference Proceedings

Scientific paper

10.1063/1.3009479

Using detailed Monte Carlo radiative transfer simulations in realistic models for galactic nuclei, we investigate the influence of interstellar dust in ionized gas discs on the rotation curves and the resulting black hole mass measurements. We find that absorption and scattering by interstellar dust leaves the shape of the rotation curves basically unaltered, but slightly decreases the central slope of the rotation curves. As a result, the "observed" black hole masses are systematically underestimated by some 10 to 20% for realistic optical depths. We therefore argue that the systematic effect of dust attenuation should be taken into account when estimating SMBH masses using ionized gas kinematics.

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